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re: "The solenoid makes a healthy click and visibly lifts the lever, say, ¼â??
Sorry if this has been covered, but how did you adjust the lift on the
operating valve? The typical 'stick a drill bit in the hole on the side
opposite the solenoid' technique is known to be unreliable, the best way
is to measure lift at the operating valve/shaft; 1/32" is the correct
distance IIRC.
Bob
On 4/26/2024 4:15 PM, Simon Lachlan via Healeys wrote:
>
> Bob,
>
> Thanks for this.
>
> Iâ??ve determined this much:-
>
> After, say, 5 miles the car started slipping in/out of OD. It was a
> slower in/out than one would obtain with the dashboard switch. Sort of
> slipping in/out. Not â??dropping outâ?? so far as I can determine.
>
> Per Michaelâ??s advice, I removed the operating valve and charged
> up/down hills and along a Motorway. No slippage. At all. I concluded
> that the clutch on the flywheel was not slipping. (TG, as itâ??s
> practically brand new).
>
> I then replaced the all the valve components under a gauge, jacked the
> car up/wheels off the ground and spun up the engine..into gear and
> switched on the OD. A steady 500psi which remained steady with the
> engine off until I engaged/disengaged the OD a few times. Which, from
> memory, is what one would expect. At this stage I cleaned out the rod.
> No dirt detected in little hole but could easily miss a flake of paint
> or a piece of swarf��
>
> The solenoid makes a healthy click and visibly lifts the lever, say,
> ¼â??. Appears(!) healthy. OD seems to go in and out as it should and not
> slip but wheels are off the ground so not a fair test for slippage.
>
> The whole OD was rebuilt, by OD spares about 15 years ago since when
> itâ??s had a fairly relaxed time and about 15,000 miles. Very seldom
> more than 80mph and usually cruising at 65mph on Motorway. The front,
> pump end, was rebuilt by ODSpares in late 2021. Car has a 28% OD and a
> 3:54 diff so 65mph is fairly relaxed rev wise.
>
> Have not delved into Throttle Switch, Relay or Solenoid yet. Will do
> so, in that order, when weather permits test drives.
>
> Thank you everyone for your help and attention in this matter,
>
> Simon
>
> *From:*Healeys <healeys-bounces@autox.team.net> *On Behalf Of *Bob Spidell
> *Sent:* Friday, April 26, 2024 7:17 PM
> *To:* gradea1@charter.net; healeys@autox.team.net
> *Subject:* Re: [Healeys] Overdrive pressure or clutch slip Step 2!
>
> I lost the plot (not unusual): Have we determined, for sure, that the
> problem is 'slippage,' which would most likely be due to wear in the
> O/D cone clutch? Or have we determined that Simon's O/D is 'dropping
> out' which, to my thinking, would be caused by the 8 strong springs
> overcoming hydraulic pressure (and causing the brake ring to slip or
> disengage, no?).
>
> On 4/26/2024 10:03 AM, Hank Leach wrote:
>
> Ok the pressure gauge implies that the hydraulic system is in good
> condition and that will effectively produce overdrive when the
> cone clutch is pushed forward in the box. When OD is *not
> required* the solenoid is inactive and the 8 springs in the unit
> have to keep the cone clutch in the rearward or in direct drive
> position.
>
> These are stout springs and normally are strong enough to engage
> and hold the clutch without slipping, overcoming the hydraulic
> influence-which should be draining at this point..However if the
> springs are misinstalled in the wrong position or not properly
> mounted on their tabs upon assembly or previously "coil bound"
> from that procedure or wear, they will not function to keep direct
> drive solid without slipping.
>
> The clutch material should outlive all of us and is not normally,
> or easily, replaced. All you have to keep the car in direct drive
> are those 8 springs and their pressure.
> -Hate to say it but if the re-assembly was defective, the gearbox
> needs to come out and OD removed and checked for correct spring
> fit-at that time I would replace the 8 springs (about $100 from
> Moss) as a routine repair. (photos from my article in AH Mag) Hank
>
> From: "Bob Spidell" <bspidell@comcast.net>
> Sent: April 26, 2024 at 9:37 AM PDT
> Subject: Re: [Healeys] Overdrive pressure or clutch slip Step 2!
> Spitballing ...
>
> I went through my BJ8's O/D a few years ago. The car had 64K miles
> on it when I bought it (approx. 1984), and about 215K* miles on it
> when I did the overhaul. The O/D cone clutch was serviceable--and
> AFAIK didn't slip--and I reinstalled it. If new cone clutches were
> readily available I /might/ have bought new, on principle,
> depending on cost, but all I could find was a re-manned one from
> DWM. To me this implied they didn't often need replacement,
> whereas known wear items like the accumulator are offered by
> several vendors (I would have installed one with an O-ring if I'd
> known about it).
>
> All this to say, unless the car has extremely high mileage and/or
> the O/D has been abused somehow I'd be surprised if the clutch is
> worn 'to the bone.' Obviously, slippage in the cone clutch would
> cause Simon's car's symptoms; if so, the problem will get
> progressively worse (and more consistent). I think one way to test
> an O/D clutch would be to really lug the car pulling an uphill
> grade in 4th-O/D, if the clutch is going to slip it would do it
> then (as would a worn engine clutch). There's also a (remote)
> possibility that, for some reason, O/D pressure fluctuates during
> driving.
>
>
> * Anyone else have this many or more known miles on a Healey?
>
> bs
>
> On 4/26/2024 4:51 AM, Michael Salter wrote:
>
> "What I canâ??t do is understand the leap to the OD cone clutch?"
>
> Â Fair question.
>
> Between the flywheel and the rear wheels there are only 2
> places where "slippage" can occur these are the clutch and the
> overdrive's cone clutch.
>
> The gearbox, other than the cone clutch in the overdrive, is a
> go/no go arrangement, i.e. no "slippage".
>
> The rear wheel splines, believe it or not, can also produce
> "slippage " if they are in really bad condition but I presume
> that isn't the case here.
>
> The test that you just completed resulted in no driveline
> slippage when the overdrive was disabled.
>
> You are reporting slippage when the overdrive operating system
> is enabled so it follows that further diagnosis of that is
> required.
>
> Yes, your next step would be the same test drive, i.e. full
> engine torque on an uphill grade, to confirm that the slippage
> issue has returned now that the overdriveoperating valvehasbe
> re-installed.
>
> I would do this test drive BEFORE making any adjustments to
> the overdrive valve or solenoid in order to confirm that
> meerly installing the overdrive operating valve resulted in
> the slippage issue returning.
>
> Hope the weather improves, beautiful day here.
>
> M
>
> On Fri., Apr. 26, 2024, 7:24 a.m. Simon Lachlan,
> <simon.lachlan@alexarevel.plus.com> wrote:
>
> Hi, Thanks for this.
>
> Not sure I understand fully.
>
> Once Iâ??d finished the test drive with the OD operating
> valve out of the car, I returned the rod, ball, spring etc
> and put in the gauge rather than the nut. And got 500+ psi.
>
> What I canâ??t do is understand the leap to the OD cone
> clutch. Not arguingâ?¦just saying no comprende. As I sat in
> the car, I was thinking that the function of the OD seems
> OK and that itâ??s being interfered with by something in its
> circuitryâ?¦â?¦relay, solenoid or throttle switch. Thatâ??s
> probably wishful thinking as I really donâ??t want to be
> swimming in those waters.
>
> I did, as a matter of course, clean out the tiny hole in
> the rod but didnâ??t detect any blockageâ?¦.which doesnâ??t mean
> much as something minute could have been inside and been
> washed away by the detergent/hot water then WD40â?¦..
>
> After someoneâ??s advice â?? some time back â?? Iâ??ve got another
> rod whose aperture has been drilled out to 1.5mm. This was
> â??to allow the OD to disengage fasterâ??. Donâ??t recall if I
> tried it. Could that rod be any help here?
>
> The ball seems to be sitting square on its seat and the
> tip of the rod, where the ball sits, is not worn or chipped.
>
> Residual pressureâ?¦.. goes to 500+ when I switch OD ON and
> stays there until, engine and switch OFF, I energize the
> solenoid a few times whereupon it drops to zero.
>
> Another test drive(s) seems called for. But the hood is
> off to enable access and the forecast is grim for the next
> week.
>
> Very open to more suggestions. Thanks,
>
> Simon
>
> *From:*Michael Salter <michaelsalter@gmail.com>
> *Sent:* Friday, April 26, 2024 12:14 AM
> *To:* Simon Lachlan <simon.lachlan@alexarevel.plus.com>
> *Cc:* Healeys <healeys@autox.team.net>
> *Subject:* Re: Overdrive pressure or clutch slip Step 2!
>
> Okay, then it is confirmed that neither the clutch (on the
> flywheel) nor the overdrive cone clutch (in it's normal
> drive condition) are producing the slippage.
>
> From this we can conclude that even when the overdrive
> solenoid is *_not_* energized the slippage is occurring at
> the overdrive cone clutch and that for some reason
> hydraulic pressure is finding its way into the overdrive
> operating cylinders even when the overdrive operating
> valve is closed.
>
> This can be caused by leakage past operating the valve or
> residual pressure.
>
> The question of residual pressure can be resolved by
> checking that the bleed hole in the bottom of the long
> overdrive valve push rod is not blocked.
>
> Whether or not hydraulic pressure is leaking past the
> operating valve ball can be checked by ensuring that the
> ball is clearly on its seat when the operating valve is
> *_not _*Â energized.
>
> M
>
> On Thu., Apr. 25, 2024, 3:38 p.m. Simon Lachlan,
> <simon.lachlan@alexarevel.plus.com> wrote:
>
> Of course. Isnâ??t that how I got the 520psi?
>
> *From:*Michael Salter <michaelsalter@gmail.com>
> *Sent:* Thursday, April 25, 2024 6:19 PM
> *To:* Simon Lachlan <simon.lachlan@alexarevel.plus.com>
> *Cc:* Healeys <healeys@autox.team.net>
> *Subject:* Re: Overdrive pressure or clutch slip Step 2!
>
> Question ... when you got home and did the pressure
> test I presume that was AFTER you had put the valve
> with the "top hat", ball, spring and valve rod cap and
> washer back into position?
>
> M
>
> On Thu., Apr. 25, 2024, 12:29 p.m. Simon Lachlan,
> <simon.lachlan@alexarevel.plus.com> wrote:
>
> So, here is Michaelâ??s â??Step 1â?? completed. (See his
> email, below).
>
> 1. Removed the operating valve and, just for
> luck, disconnected the two wires into 3^rd
> /4^th switch. Took the car for a spin. Up/down
> longish/steepish hills, 10 miles on motorway.
> Various rpmâ?¦..no slippage at all.
> 2. Had a punctureâ?¦..nail in tyre. Rear RHS. Flat
> as a pancake at once. Nearly onto rim. Nail! I
> imagine the inner tube is shredded and the
> tyre may be a write-off. (Usually are!).
> Anyhow, I bore you with this as Iâ??m convinced
> that Iâ??d never have got the wheel off without
> the little scissors jack which I carry to get
> the car up the first few inches until the
> Healey jack comes into play. Just a suggestion��.
> 3. Got home and jacked car up to test pressure.
> Steady at 520psi which, I recall, is plenty.
> Stayed at 520 across rev range. Dropped very
> slowly once engine was off and dropped to zero
> as I engaged/disengaged OD a few times. Which
> is normal I think?
> 4. Solenoid makes a robust â??clickâ?? when it should
> and engages the OD when activated.
>
> So whatâ??s a sensible â??Step 2â????
>
> I have been urged to check the setting of the
> Throttle Switch (TS). Assuming that the slippage
> returns (and why wouldnâ??t it?), Iâ??ll short the TS
> out to see if that fixes it. If it does, Iâ??ll
> check the adjustment.
>
> Suggestions would be more than welcome��I do dread
> having to take that box out again. Iâ??ve got a very
> adequate ramp and a very strong volunteer(?) but,
> regardless of all that, itâ??s still quite a task.
> And, like a few of us, Iâ??m not as young as I once
> was. Iâ??ve always enjoyed the lines from the manual
> which I reproduce, below. ���Gently easeâ??!?!
>
> Thanks, Simon
>
> *From:*Michael Salter <michaelsalter@gmail.com>
> *Sent:* Monday, April 22, 2024 3:21 PM
> *To:* Simon Lachlan
> <simon.lachlan@alexarevel.plus.com>
> *Cc:* Healeys <healeys@autox.team.net>
> *Subject:* Re: [Healeys] Overdrive pressure or
> clutch slip
>
> *_Correct diagnosis is 1/2 the repair!!_*
>
> First you need to confirm whether the clutch (on
> the flywheel) or the overdrive is causing the
> slippage.
>
> To do this you ABSOLUTELY MUST disable the
> overdrive as a badly misadjuster overdrive
> operating valve can produce similar symptoms.
>
> To do this I would remove the overdrive operating
> valve completely. (There are other ways but this
> is absolutely definitive).
>
> Now drive the car up a long hill where you are
> amle to use full throttle at around 3000 RPM
> (maximum torque) for a few seconds. If it is the
> clutch (on the flywheel) that is causing the
> slippage these operating conditions. Test this a
> few times to be sure.
>
> If there is no slippage we have confirmed that the
> overdrive clutch is at fault.
>
> Step 1 completed. Please report results. MS.
>
> On Mon., Apr. 22, 2024, 8:08 a.m. Simon
> Lachlan via Healeys, <healeys@autox.team.net>
> wrote:
>
> You may recall the very extended overdrive
> and clutch saga last year. Long story
> short(ish)â?¦
>
> OD was slipping in and out depending on
> oil temperature.
>
> Correctly diagnosed pressure. Checked with
> gauge.
>
> Attempted rebuildâ?¦going only so far as
> accumulator and related seals.
>
> Stymied as could not get pump out. Turned
> out to have been â??fixedâ?? at some stage
> with some form of â??chemical metalâ?? which
> was coming loose/apart.
>
> Took it up to OD Spares who fixed it..new
> housing etcetc
>
> Why not a new clutch I thought? Sensible
> while youâ??re in the area looking at a 30+
> yr old item.
>
> New clutchâ?¦no good. Noisy, wouldnâ??t
> engage/disengage/play at all.
>
> Gearbox out again.
>
> Refit clutch. Presumed Iâ??d made some
> beginnerâ??s mistake.
>
> Refit gearboxâ?¦no good. Same
>
> Canâ??t recall whether I tried again. Lost
> count and enthusiasm by now.
>
> Turned out that the new clutch kit was
> defective. (Thanks Mirek) (Genuine B&B
> from AHSpares).
>
> New one did work.
>
> Saga over until yesterday.
>
> Same sort of symptomsâ?¦..
>
> Allâ??s well for first 10 or so miles. Then
> the dreaded slippage(?) starts. But itâ??s
> not quite the same. Reminds me more of a
> slipping clutch. (But NO smell)
>
> Symptoms continue if itâ??s in or out of OD.
>
> Symptoms reduce at speed.
>
> Yes, plenty of oil. Over the full mark.
> Looks very clean. Pretty sure itâ??s 40wt
> non-detergent topped up with 30wt
> non-detergent. (Or vice-versa). Am
> confident in state of the filter, magnets etc.
>
> No, I have not pressure tested it yet and
> yes, I dread restarting the whole bloody
> process all over again. Iâ??m not sure I can
> face taking the box out again once, let
> alone multiple times.
>
> What I want and experience tells me Iâ??m
> unlikely to get is a miracle cure!
>
> One initial questionâ?¦..do OD relays either
> work or not work? ie, can the relay hover
> between on and off which might lead to the
> OD coming in and out? I think that could
> happen if the switch is off but the unit
> still hasnâ??t got the message to disengage
> from the bulkhead switch.
>
> And a supplementaryâ?¦.how do I bench test
> the relay?
>
> Simon
>
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>
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re: "<span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">The
solenoid makes a healthy click and visibly lifts the lever, say,
¼â??<br>
<br>
Sorry if this has been covered, but how did you adjust the lift on
the operating valve? The typical 'stick a drill bit in the hole on
the side opposite the solenoid' technique is known to be
unreliable, the best way is to measure lift at the operating
valve/shaft; 1/32" is the correct distance IIRC.<br>
<br>
Bob<br>
</span><br>
<div class="moz-cite-prefix">On 4/26/2024 4:15 PM, Simon Lachlan via
Healeys wrote:<br>
</div>
<blockquote type="cite"
cite="mid:001901da982f$a9dd7a00$fd986e00$@alexarevel.plus.com">
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<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">Bob,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">Thanks
for this.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">Iâ??ve
determined this much:-<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">After,
say, 5 miles the car started slipping in/out of OD. It was a
slower in/out than one would obtain with the dashboard
switch. Sort of slipping in/out. Not â??dropping outâ?? so far
as I can determine.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">Per
Michaelâ??s advice, I removed the operating valve and charged
up/down hills and along a Motorway. No slippage. At all. I
concluded that the clutch on the flywheel was not slipping.
(TG, as itâ??s practically brand new).<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">I
then replaced the all the valve components under a gauge,
jacked the car up/wheels off the ground and spun up the
engine..into gear and switched on the OD. A steady 500psi
which remained steady with the engine off until I
engaged/disengaged the OD a few times. Which, from memory,
is what one would expect. At this stage I cleaned out the
rod. No dirt detected in little hole but could easily miss a
flake of paint or a piece of swarf��<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">The
solenoid makes a healthy click and visibly lifts the lever,
say, ¼â??. Appears(!) healthy. OD seems to go in and out as it
should and not slip but wheels are off the ground so not a
fair test for slippage. <o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">The
whole OD was rebuilt, by OD spares about 15 years ago since
when itâ??s had a fairly relaxed time and about 15,000 miles.
Very seldom more than 80mph and usually cruising at 65mph on
Motorway. The front, pump end, was rebuilt by ODSpares in
late 2021. Car has a 28% OD and a 3:54 diff so 65mph is
fairly relaxed rev wise.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">Have
not delved into Throttle Switch, Relay or Solenoid yet. Will
do so, in that order, when weather permits test
drives.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">Thank
you everyone for your help and attention in this
matter,<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US">Simon<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-family:"Times New
Roman",serif;mso-fareast-language:EN-US"><o:p>Â </o:p></span></p>
<div>
<div
style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US"> Healeys <<a
href="mailto:healeys-bounces@autox.team.net";
moz-do-not-send="true"
class="moz-txt-link-freetext">healeys-bounces@autox.team.net</a>>
<b>On Behalf Of </b>Bob Spidell<br>
<b>Sent:</b> Friday, April 26, 2024 7:17 PM<br>
<b>To:</b> <a href="mailto:gradea1@charter.net";
moz-do-not-send="true"
class="moz-txt-link-freetext">gradea1@charter.net</a>;
<a href="mailto:healeys@autox.team.net";
moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a><br>
<b>Subject:</b> Re: [Healeys] Overdrive pressure or
clutch slip Step 2!<o:p></o:p></span></p>
</div>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">I lost the
plot (not unusual): Have we determined, for sure, that the
problem is 'slippage,' which would most likely be due to wear
in the O/D cone clutch? Or have we determined that Simon's O/D
is 'dropping out' which, to my thinking, would be caused by
the 8 strong springs overcoming hydraulic pressure (and
causing the brake ring to slip or disengage, no?). <o:p></o:p></p>
<div>
<p class="MsoNormal">On 4/26/2024 10:03 AM, Hank Leach
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class="MsoNormal">Ok the pressure gauge implies that the
hydraulic system is in good condition and that will
effectively produce overdrive when the cone clutch is
pushed forward in the box. When OD is <strong><span
style="font-family:"Aptos",sans-serif">not
required</span></strong> the solenoid is inactive and
the 8 springs in the unit have to keep the cone clutch in
the rearward or in direct drive position.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">These are stout springs and normally
are strong enough to engage and hold the clutch without
slipping, overcoming the hydraulic influence-which should
be draining at this point..However if the springs are
misinstalled in the wrong position or not properly mounted
on their tabs upon assembly or previously "coil bound"
from that procedure or wear, they will not function to
keep direct drive solid without slipping.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt">The clutch
material should outlive all of us and is not normally, or
easily, replaced. All you have to keep the car in direct
drive are those 8 springs and their pressure.<br>
-Hate to say it but if the re-assembly was defective, the
gearbox needs to come out and OD removed and checked for
correct spring fit-at that time I would replace the 8
springs (about $100 from Moss) as a routine repair.
(photos from my article in AH Mag) Hank<br>
<br>
From: "Bob Spidell" <a href="mailto:bspidell@comcast.net";
moz-do-not-send="true"><bspidell@comcast.net></a>
<br>
To: <a href="mailto:healeys@autox.team.net";
moz-do-not-send="true"><healeys@autox.team.net></a>
<br>
Sent: April 26, 2024 at 9:37 AM PDT <br>
Subject: Re: [Healeys] Overdrive pressure or clutch slip
Step 2! <br>
Spitballing ...<br>
<br>
I went through my BJ8's O/D a few years ago. The car had
64K miles on it when I bought it (approx. 1984), and about
215K* miles on it when I did the overhaul. The O/D cone
clutch was serviceable--and AFAIK didn't slip--and I
reinstalled it. If new cone clutches were readily
available I <em><span
style="font-family:"Aptos",sans-serif">might</span></em>
have bought new, on principle, depending on cost, but all
I could find was a re-manned one from DWM. To me this
implied they didn't often need replacement, whereas known
wear items like the accumulator are offered by several
vendors (I would have installed one with an O-ring if I'd
known about it).<br>
<br>
All this to say, unless the car has extremely high mileage
and/or the O/D has been abused somehow I'd be surprised if
the clutch is worn 'to the bone.' Obviously, slippage in
the cone clutch would cause Simon's car's symptoms; if so,
the problem will get progressively worse (and more
consistent). I think one way to test an O/D clutch would
be to really lug the car pulling an uphill grade in
4th-O/D, if the clutch is going to slip it would do it
then (as would a worn engine clutch). There's also a
(remote) possibility that, for some reason, O/D pressure
fluctuates during driving.<br>
<br>
<br>
* Anyone else have this many or more known miles on a
Healey?<br>
<br>
bs<br>
<br>
<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal">On 4/26/2024 4:51 AM, Michael Salter
wrote:<o:p></o:p></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New Roman",serif">"What
I canâ??t do is understand the leap to the OD cone
clutch?"</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New
Roman",serif">Â </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New Roman",serif">Â Fair
question.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New Roman",serif">Between
the flywheel and the rear wheels there are only 2
places where "slippage" can occur these are the
clutch and the overdrive's cone
clutch. </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New Roman",serif">The
gearbox, other than the cone clutch in the
overdrive, is a go/no go arrangement, i.e. no
"slippage".</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New Roman",serif">The
rear wheel splines, believe it or not, can also
produce "slippage " if they are in really bad
condition but I presume that isn't the case
here.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New
Roman",serif">Â </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New Roman",serif">The
test that you just completed resulted in no
driveline slippage when the overdrive was
disabled. </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New Roman",serif">You
are reporting slippage when the overdrive operating
system is enabled so it follows that further
diagnosis of that is required.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt;font-family:"Times New
Roman",serif">Â </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.5pt">Yes,
your next step would be the same test drive, i.e.
full engine torque on an uphill grade, to confirm
that the slippage issue has returned now that the
overdriveoperating valvehasbe
re-installed.  </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.5pt">I
would do this test drive BEFORE making any
adjustments to the overdrive valve or solenoid in
order to confirm that meerly installing the
overdrive operating valve resulted in the slippage
issue returning. </span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span style="font-size:9.5pt">Hope
the weather improves, beautiful day
here.</span><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"><span
style="font-size:9.5pt">M</span><o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<div>
<div>
<p class="MsoNormal">On Fri., Apr. 26, 2024, 7:24 a.m.
Simon Lachlan, <<a
href="mailto:simon.lachlan@alexarevel.plus.com";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">simon.lachlan@alexarevel.plus.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote
style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Hi, Thanks for
this.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Not sure I
understand fully. </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Once Iâ??d finished
the test drive with the OD operating valve out
of the car, I returned the rod, ball, spring etc
and put in the gauge rather than the nut. And
got 500+ psi. </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">What I canâ??t do is
understand the leap to the OD cone clutch. Not
arguingâ?¦just saying no comprende. As I sat in
the car, I was thinking that the function of the
OD seems OK and that itâ??s being interfered with
by something in its circuitry��relay, solenoid
or throttle switch. Thatâ??s probably wishful
thinking as I really donâ??t want to be swimming
in those waters.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">I did, as a matter
of course, clean out the tiny hole in the rod
but didnâ??t detect any blockageâ?¦.which doesnâ??t
mean much as something minute could have been
inside and been washed away by the detergent/hot
water then WD40â?¦..</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">After someoneâ??s
advice â?? some time back â?? Iâ??ve got another rod
whose aperture has been drilled out to 1.5mm.
This was â??to allow the OD to disengage fasterâ??.
Donâ??t recall if I tried it. Could that rod be
any help here?</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">The ball seems to
be sitting square on its seat and the tip of the
rod, where the ball sits, is not worn or
chipped.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Residual
pressureâ?¦.. goes to 500+ when I switch OD ON and
stays there until, engine and switch OFF, I
energize the solenoid a few times whereupon it
drops to zero.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Another test
drive(s) seems called for. But the hood is off
to enable access and the forecast is grim for
the next week.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Very open to more
suggestions. Thanks,</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New
Roman",serif">Simon</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<div
style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><strong><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></strong><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
Michael Salter <<a
href="mailto:michaelsalter@gmail.com";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">michaelsalter@gmail.com</a>>
<br>
<strong><span
style="font-family:"Calibri",sans-serif">Sent:</span></strong>
Friday, April 26, 2024 12:14 AM<br>
<strong><span
style="font-family:"Calibri",sans-serif">To:</span></strong>
Simon Lachlan <<a
href="mailto:simon.lachlan@alexarevel.plus.com"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">simon.lachlan@alexarevel.plus.com</a>><br>
<strong><span
style="font-family:"Calibri",sans-serif">Cc:</span></strong>
Healeys <<a
href="mailto:healeys@autox.team.net";
target="_blank" moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>><br>
<strong><span
style="font-family:"Calibri",sans-serif">Subject:</span></strong>
Re: Overdrive pressure or clutch slip Step
2!</span><o:p></o:p></p>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Okay, then it
is confirmed that neither the clutch (on the
flywheel) nor the overdrive cone clutch (in it's
normal drive condition) are producing the
slippage. <o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">From this we
can conclude that even when the overdrive
solenoid is <strong><u><span
style="font-family:"Aptos",sans-serif">not</span></u></strong>
energized the slippage is occurring at the
overdrive cone clutch and that for some reason
hydraulic pressure is finding its way into the
overdrive operating cylinders even when the
overdrive operating valve is closed.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">This can be
caused by leakage past operating the valve or
residual pressure.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">The question
of residual pressure can be resolved by
checking that the bleed hole in the bottom of
the long overdrive valve push rod is not
blocked.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Whether or
not hydraulic pressure is leaking past the
operating valve ball can be checked by
ensuring that the ball is clearly on its seat
when the operating valve is <strong><u><span
style="font-family:"Aptos",sans-serif">not </span></u></strong> energized.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">M<o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Thu., Apr.
25, 2024, 3:38 p.m. Simon Lachlan, <<a
href="mailto:simon.lachlan@alexarevel.plus.com"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">simon.lachlan@alexarevel.plus.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote
style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Of course. Isnâ??t
that how I got the 520psi?</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<div
style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><strong><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></strong><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
Michael Salter <<a
href="mailto:michaelsalter@gmail.com"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">michaelsalter@gmail.com</a>>
<br>
<strong><span
style="font-family:"Calibri",sans-serif">Sent:</span></strong>
Thursday, April 25, 2024 6:19 PM<br>
<strong><span
style="font-family:"Calibri",sans-serif">To:</span></strong>
Simon Lachlan <<a
href="mailto:simon.lachlan@alexarevel.plus.com"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">simon.lachlan@alexarevel.plus.com</a>><br>
<strong><span
style="font-family:"Calibri",sans-serif">Cc:</span></strong>
Healeys <<a
href="mailto:healeys@autox.team.net";
target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>><br>
<strong><span
style="font-family:"Calibri",sans-serif">Subject:</span></strong>
Re: Overdrive pressure or clutch slip
Step 2!</span><o:p></o:p></p>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Question ...
when you got home and did the pressure
test I presume that was AFTER you had
put the valve with the "top hat", ball,
spring and valve rod cap and washer back
into position?<o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">M<o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
</div>
</div>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Thu., Apr.
25, 2024, 12:29 p.m. Simon Lachlan,
<<a
href="mailto:simon.lachlan@alexarevel.plus.com"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">simon.lachlan@alexarevel.plus.com</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote
style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">So, here is
Michaelâ??s â??Step 1â?? completed.
(See his email,
below).</span><o:p></o:p></p>
<ol type="1" start="1">
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1
lfo3"><span
style="font-family:"Times New Roman",serif">Removed the
operating valve and, just for
luck, disconnected the two
wires into
3<sup>rd</sup>/4<sup>th</sup>
switch. Took the car for a
spin. Up/down longish/steepish
hills, 10 miles on motorway.
Various rpmâ?¦..no slippage at
all.</span><o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1
lfo3"><span
style="font-family:"Times New Roman",serif">Had a
punctureâ?¦..nail in tyre. Rear
RHS. Flat as a pancake at
once. Nearly onto rim. Nail! I
imagine the inner tube is
shredded and the tyre may be a
write-off. (Usually are!).
Anyhow, I bore you with this
as Iâ??m convinced that Iâ??d
never have got the wheel off
without the little scissors
jack which I carry to get the
car up the first few inches
until the Healey jack comes
into play. Just a
suggestion��.</span><o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1
lfo3"><span
style="font-family:"Times New Roman",serif">Got home and
jacked car up to test
pressure. Steady at 520psi
which, I recall, is plenty.
Stayed at 520 across rev
range. Dropped very slowly
once engine was off and
dropped to zero as I
engaged/disengaged OD a few
times. Which is normal I
think?</span><o:p></o:p></li>
<li class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto;mso-list:l1 level1
lfo3"><span
style="font-family:"Times New Roman",serif">Solenoid makes a
robust â??clickâ?? when it should
and engages the OD when
activated.</span><o:p></o:p></li>
</ol>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">So whatâ??s a
sensible â??Step
2â????</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">I have been urged
to check the setting of the
Throttle Switch (TS). Assuming
that the slippage returns (and
why wouldnâ??t it?), Iâ??ll short
the TS out to see if that fixes
it. If it does, Iâ??ll check the
adjustment.</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Suggestions would
be more than welcome��I do dread
having to take that box out
again. Iâ??ve got a very adequate
ramp and a very strong
volunteer(?) but, regardless of
all that, itâ??s still quite a
task. And, like a few of us, Iâ??m
not as young as I once was. Iâ??ve
always enjoyed the lines from
the manual which I reproduce,
below. </span><span
style="font-family:"Tahoma",sans-serif">���</span><span
style="font-family:"Times New Roman",serif">Gently easeâ??!?!
</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Thanks,
Simon</span><o:p></o:p></p>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><span
style="font-family:"Times New Roman",serif">Â </span><o:p></o:p></p>
<div
style="border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><strong><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></strong><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif">
Michael Salter <<a
href="mailto:michaelsalter@gmail.com"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">michaelsalter@gmail.com</a>> <br>
<strong><span
style="font-family:"Calibri",sans-serif">Sent:</span></strong>
Monday, April 22, 2024 3:21 PM<br>
<strong><span
style="font-family:"Calibri",sans-serif">To:</span></strong>
Simon Lachlan <<a
href="mailto:simon.lachlan@alexarevel.plus.com"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">simon.lachlan@alexarevel.plus.com</a>><br>
<strong><span
style="font-family:"Calibri",sans-serif">Cc:</span></strong>
Healeys <<a
href="mailto:healeys@autox.team.net"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>><br>
<strong><span
style="font-family:"Calibri",sans-serif">Subject:</span></strong>
Re: [Healeys] Overdrive
pressure or clutch
slip</span><o:p></o:p></p>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"><strong><u><span
style="font-family:"Aptos",sans-serif">Correct diagnosis is
1/2 the
repair!!</span></u></strong><o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">First you
need to confirm whether the
clutch (on the flywheel) or the
overdrive is causing the
slippage. <o:p></o:p></p>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">To do this
you ABSOLUTELY MUST disable
the overdrive as a badly
misadjuster overdrive
operating valve can produce
similar symptoms. <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">To do this I
would remove the overdrive
operating valve completely.
(There are other ways but this
is absolutely
definitive).<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Now drive the
car up a long hill where you
are amle to use full throttle
at around 3000 RPM (maximum
torque) for a few seconds. If
it is the clutch (on the
flywheel) that is causing the
slippage these operating
conditions. Test this a few
times to be sure.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">If there is
no slippage we have confirmed
that the overdrive clutch is
at fault.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Step 1
completed. Please report
results. MS.<o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
</div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
</div>
</div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Â <o:p></o:p></p>
<div>
<blockquote
style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<div>
<div>
<p class="MsoNormal"
style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">On Mon., Apr.
22, 2024, 8:08 a.m. Simon
Lachlan via Healeys, <<a
href="mailto:healeys@autox.team.net"; target="_blank"
moz-do-not-send="true"
class="moz-txt-link-freetext">healeys@autox.team.net</a>>
wrote:<o:p></o:p></p>
</div>
<blockquote
style="border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm
6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-bottom:5.0pt">
<div>
<p><span
style="font-family:"Times New Roman",serif">You may recall the
very extended
overdrive and clutch
saga last year.</span>
<span
style="font-family:"Times New Roman",serif">Long story
short(ish)â?¦</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">OD was slipping in
and out depending on
oil
temperature.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Correctly
diagnosed pressure.
Checked with
gauge.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Attempted
rebuildâ?¦going only so
far as</span> <span
style="font-family:"Times New Roman",serif">accumulator and
related
seals.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Stymied as could
not get pump out.
Turned out to have
been â??fixedâ?? at some
stage with some form
of â??chemical metalâ??
which was coming
loose/apart.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Took it up to OD
Spares who fixed
it..new housing
etcetc</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Why not a new
clutch I thought?
Sensible while youâ??re
in the area looking at
a 30+ yr old
item.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">New clutchâ?¦no
good. Noisy, wouldnâ??t</span>
<span
style="font-family:"Times New Roman",serif">engage/disengage/play
at all.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Gearbox out
again.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Refit clutch.
Presumed Iâ??d made some
beginnerâ??s
mistake.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Refit gearboxâ?¦no
good.
Same</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Canâ??t recall
whether I tried again.
Lost count and
enthusiasm by
now.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Turned out that
the new clutch kit was
defective. (Thanks
Mirek) (Genuine
B&B from
AHSpares).</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">New one did
work.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Saga over until
yesterday.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Same sort of
symptomsâ?¦..</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Allâ??s well for
first 10 or so miles.
Then the dreaded
slippage(?) starts.
But itâ??s not quite the
same. Reminds me more
of a slipping clutch.
(But NO
smell)</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Symptoms continue
if itâ??s in or out of
OD.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Symptoms reduce at
speed.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">Yes, plenty of
oil. Over the full
mark. Looks very
clean. Pretty sure
itâ??s 40wt</span> <span
style="font-family:"Times New Roman",serif">non-detergent
topped up with 30wt
non-detergent. (Or
vice-versa).</span> <span
style="font-family:"Times New Roman",serif">Am confident in
state of the filter,
magnets
etc.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">No, I have not
pressure tested it yet
and yes, I dread
restarting the whole
bloody process all
over again. Iâ??m not
sure I can face taking
the box out again
once, let alone
multiple
times.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">What I want and
experience tells me
Iâ??m unlikely to get is
a miracle
cure!</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">One initial
questionâ?¦..do OD
relays either work or
not work? ie, can the
relay hover between on
and off</span> <span
style="font-family:"Times New Roman",serif">which might lead
to the OD coming in
and out? I think that
could happen if the
switch is off but the
unit still hasnâ??t got
the message to
disengage from the
bulkhead
switch.</span><o:p></o:p></p>
<p><span
style="font-family:"Times New Roman",serif">And a
supplementaryâ?¦.how</span>
<span
style="font-family:"Times New Roman",serif">do I bench test</span>
<span
style="font-family:"Times New Roman",serif">the
relay?</span><o:p></o:p></p>
<p><span
style="font-family:"Times New
Roman",serif">Simon</span><o:p></o:p></p>
</div>
</blockquote>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
<p class="MsoNormal"><o:p>Â </o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
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</blockquote>
<div>
<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p>Â </o:p></p>
</div>
</blockquote>
<p class="MsoNormal"><o:p>Â </o:p></p>
</div>
<br>
<fieldset class="moz-mime-attachment-header"></fieldset>
<pre class="moz-quote-pre"
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