Re: [Healeys] Overdrive pressure or clutch slip

[Michael Salter <michaelsalter@gmail.com>]

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*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.



On Mon., Apr. 22, 2024, 9:03 a.m. Michael Salter, <michaelsalter@gmail.com>
wrote:

> In my experience relays are yes/no. No "maybe".
>
> 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. Lo=
ng
>> story short(ish)=E2=80=A6
>>
>> OD was slipping in and out depending on oil temperature.
>>
>> Correctly diagnosed pressure. Checked with gauge.
>>
>> Attempted rebuild=E2=80=A6going only so far as accumulator and related s=
eals.
>>
>> Stymied as could not get pump out. Turned out to have been =E2=80=9Cfixe=
d=E2=80=9D at
>> some stage with some form of =E2=80=9Cchemical metal=E2=80=9D 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 you=E2=80=99re in the are=
a looking
>> at a 30+ yr old item.
>>
>> New clutch=E2=80=A6no good. Noisy, wouldn=E2=80=99t engage/disengage/pla=
y at all.
>>
>> Gearbox out again.
>>
>> Refit clutch. Presumed I=E2=80=99d made some beginner=E2=80=99s mistake.
>>
>> Refit gearbox=E2=80=A6no good. Same
>>
>> Can=E2=80=99t recall whether I tried again. Lost count and enthusiasm by=
 now.
>>
>> Turned out that the new clutch kit was defective. (Thanks Mirek) (Genuin=
e
>> B&B from AHSpares).
>>
>> New one did work.
>>
>> Saga over until yesterday.
>>
>> Same sort of symptoms=E2=80=A6..
>>
>> All=E2=80=99s well for first 10 or so miles. Then the dreaded slippage(?=
) starts.
>> But it=E2=80=99s not quite the same. Reminds me more of a slipping clutc=
h. (But NO
>> smell)
>>
>> Symptoms continue if it=E2=80=99s in or out of OD.
>>
>> Symptoms reduce at speed.
>>
>> Yes, plenty of oil. Over the full mark. Looks very clean. Pretty sure
>> it=E2=80=99s 40wt non-detergent topped up with 30wt non-detergent. (Or v=
ice
>> -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. I=E2=80=99m not sure I can face tak=
ing the box
>> out again once, let alone multiple times.
>>
>> What I want and experience tells me I=E2=80=99m unlikely to get is a mir=
acle cure
>> !
>>
>> One initial question=E2=80=A6..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
>> hasn=E2=80=99t got the message to disengage from the bulkhead switch.
>>
>> And a supplementary=E2=80=A6.how do I bench test the relay?
>>
>> Simon
>> _______________________________________________
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>>
>>

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<div dir=3D"auto"><div dir=3D"auto"><b><u>Correct diagnosis is 1/2 the repa=
ir!!</u></b></div><div dir=3D"auto"><br></div>First you need to confirm whe=
ther the clutch (on the flywheel) or the overdrive is causing the slippage.=
=C2=A0<div dir=3D"auto">To do this you ABSOLUTELY MUST disable the overdriv=
e as a badly misadjuster overdrive operating valve can produce similar symp=
toms.=C2=A0</div><div dir=3D"auto">To do this I would remove the overdrive =
operating valve completely. (There are other ways but this is absolutely de=
finitive).</div><div dir=3D"auto">Now drive the car up a long hill where yo=
u are amle to use full throttle at around 3000 RPM (maximum torque) for a f=
ew seconds. If it is the clutch (on the flywheel) that is causing the slipp=
age these operating conditions. Test this a few times to be sure.</div><div=
 dir=3D"auto">If there is no slippage we have confirmed that the overdrive =
clutch is at fault.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Step=
 1 completed. Please report results.=C2=A0</div><div dir=3D"auto"><br></div=
><div dir=3D"auto"><br></div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Mon., Apr. 22, 2024, 9:03 a.m. Michael Sal=
ter, &lt;<a href=3D"mailto:michaelsalter@gmail.com";>michaelsalter@gmail.com=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir=3D"auto">I=
n my experience relays are yes/no. No &quot;maybe&quot;.</div><br><div clas=
s=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon., Apr. 22, 2=
024, 8:08 a.m. Simon Lachlan via Healeys, &lt;<a href=3D"mailto:healeys@aut=
ox.team.net" target=3D"_blank" rel=3D"noreferrer">healeys@autox.team.net</a=
>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0 0=
 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><u></u>






<div>


<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">You may =
recall the very extended overdrive and clutch saga last year.</font></span>=
<span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb=
"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"> <font face=3D"Ti=
mes New Roman">Long story short(ish)=E2=80=A6</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">OD was s=
lipping in and out depending on oil temperature.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Correctl=
y diagnosed pressure. Checked with gau</font></span><span lang=3D"en-gb"></=
span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"=
en-gb"></span><span lang=3D"en-gb"><font face=3D"Times New Roman">ge.</font=
></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Attempte=
d rebuild=E2=80=A6going only so far as</font></span><span lang=3D"en-gb"></=
span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"=
en-gb"></span><span lang=3D"en-gb"> <font face=3D"Times New Roman">accumula=
tor and related seals.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Stymied<=
/font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span =
lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><fon=
t face=3D"Times New Roman"> as could not get pump out. Turned out to have b=
een =E2=80=9Cfixed=E2=80=9D at some stage with some form of</font></span><s=
pan lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb">=
</span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Times=
 New Roman"> =E2=80=9Cchemical metal=E2=80=9D which was coming loose/apart.=
</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Took it =
up to O</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></spa=
n><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-=
gb"><font face=3D"Times New Roman">D</font></span><span lang=3D"en-gb"></sp=
an><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en=
-gb"></span><span lang=3D"en-gb"><font face=3D"Times New Roman"> Spares who=
 fi</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><s=
pan lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb">=
<font face=3D"Times New Roman">xed it..new housing etcetc</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Why not =
a new clutch I thought? Sensible while you=E2=80=99re in the area lookin</f=
ont></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span la=
ng=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font =
face=3D"Times New Roman">g at a 30+ yr old item.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">New clut=
ch=E2=80=A6no good. Noisy</font></span><span lang=3D"en-gb"></span><span la=
ng=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span=
><span lang=3D"en-gb"><font face=3D"Times New Roman">, wouldn=E2=80=99t</fo=
nt></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lan=
g=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"> <font =
face=3D"Times New Roman">engage/disengage/play at all</font></span><span la=
ng=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span=
><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Times New R=
oman">.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Gearbox =
out again.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Refit cl=
utch. Presumed I=E2=80=99d made some beginner=E2=80=99s mistake.</font></sp=
an></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Re</font=
></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font fa=
ce=3D"Times New Roman">fit gearbox=E2=80=A6no good. Same</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Can=E2=
=80=99t recall whether I tried again. Lost count and enthusiasm by now.</fo=
nt></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Turned o=
ut that the new clu</font></span><span lang=3D"en-gb"></span><span lang=3D"=
en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span=
 lang=3D"en-gb"><font face=3D"Times New Roman">tch kit was defective. (Than=
ks Mirek)</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></s=
pan><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"e=
n-gb"><font face=3D"Times New Roman"> (Genui</font></span><span lang=3D"en-=
gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span la=
ng=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Times New Roman">ne =
B&amp;B from AHSpares).</font></span><span lang=3D"en-gb"></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><=
span lang=3D"en-gb"></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">New one =
did work.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Saga ove=
r</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><spa=
n lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><f=
ont face=3D"Times New Roman"> until yesterday.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Same sor=
t of symptoms=E2=80=A6..</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">All=E2=
=80=99s well for first 10 or so miles. Then the dreaded slippage(?) s</font=
></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font fa=
ce=3D"Times New Roman">tarts. But it=E2=80=99s not quite the same. Reminds =
me more of a slipping clutch. (But NO smell)</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Symptoms=
 continue if it=E2=80=99s in or out of OD.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Symptoms=
 reduce at speed.</font></span><span lang=3D"en-gb"></span><span lang=3D"en=
-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span l=
ang=3D"en-gb"></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Yes, ple=
nty of oil. Over the full mark. Looks very clean. Pretty sure it=E2=80=99s =
40wt</font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><=
span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"=
> <font face=3D"Times New Roman">n</font></span><span lang=3D"en-gb"></span=
><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-g=
b"></span><span lang=3D"en-gb"><font face=3D"Times New Roman">on-d</font></=
span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"=
en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=
=3D"Times New Roman">etergent topped up with 30wt non-detergent. (Or vice</=
font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span l=
ang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font=
 face=3D"Times New Roman">-versa).</font></span><span lang=3D"en-gb"></span=
><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-g=
b"></span><span lang=3D"en-gb"> <font face=3D"Times New Roman">Am confident=
 in state of the filter, magnets etc.</font></span><span lang=3D"en-gb"></s=
pan><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"e=
n-gb"></span><span lang=3D"en-gb"></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">No, I ha=
ve not pressure tested it yet</font></span><span lang=3D"en-gb"></span><spa=
n lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></=
span><span lang=3D"en-gb"><font face=3D"Times New Roman"> and yes, I dread =
restarting the whole bloody process all over again. I=E2=80=99m not sure I =
can face taking the box out</font></span><span lang=3D"en-gb"></span><span =
lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></sp=
an><span lang=3D"en-gb"><font face=3D"Times New Roman"> again once, let alo=
ne multiple times.</font></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">What I w=
ant and experience tells me I=E2=80=99m unlikely to get is a miracle cure</=
font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span l=
ang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font=
 face=3D"Times New Roman">!</font></span><span lang=3D"en-gb"></span><span =
lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></sp=
an><span lang=3D"en-gb"></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">One ini<=
/font></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span =
lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"><fon=
t face=3D"Times New Roman">tial question=E2=80=A6..do OD relays either work=
 or not work? ie, can the relay hover between on and off</font></span><span=
 lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></s=
pan><span lang=3D"en-gb"></span><span lang=3D"en-gb"> <font face=3D"Times N=
ew Roman">which might lead to the OD coming in and out? I think that could =
happen if the switch is off but the</font></span><span lang=3D"en-gb"></spa=
n><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-=
gb"></span><span lang=3D"en-gb"><font face=3D"Times New Roman"> unit still =
hasn=E2=80=99t got the message to disengage from the bulkhead switch.</font=
></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">And a su=
pplementary=E2=80=A6.how</font></span><span lang=3D"en-gb"></span><span lan=
g=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span>=
<span lang=3D"en-gb"> <font face=3D"Times New Roman">d</font></span><span l=
ang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></spa=
n><span lang=3D"en-gb"></span><span lang=3D"en-gb"><font face=3D"Times New =
Roman">o I bench test</font></span><span lang=3D"en-gb"></span><span lang=
=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><=
span lang=3D"en-gb"> <font face=3D"Times New Roman">the relay?</font></span=
><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-g=
b"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span></p>

<p dir=3D"LTR"><span lang=3D"en-gb"><font face=3D"Times New Roman">Simon</f=
ont></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span><span la=
ng=3D"en-gb"></span><span lang=3D"en-gb"></span><span lang=3D"en-gb"></span=
></p>

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</blockquote></div>
</blockquote></div>

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