Re: [Fot] A-type OD leaks

[Joe via Fot <fot@autox.team.net>]

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Thanks all for all the info.  I went thru my parts stash and found an OD mai=
n shaft.  JoeB

Sent from my iPhone

> On Sep 21, 2023, at 11:35 AM, R. John Lye <rjl6n@cstone.net> wrote:
>=20
> =EF=BB=BF
> Hi Joe B..
>=20
> Henry says " you need to line up two sets of splines in the OD unit "
>=20
> This is very important, as I learned the hard way the first time that I pu=
t
> an OD back together.  I thought that I had the splines line up, but in fac=
t,
> I only had the first set lined up and snapped a plate tightening it down.
>=20
> Hope that helps,
> John =20
>=20
>=20
> On Thu, 21 Sep 2023 07:29:34 -0400, yellow04 via Fot <fot@autox.team.net> w=
rote:
> =20
> Joe,
>=20
> If your gearbox has slowly started leaking around the adapter plate, in al=
l likelihood the issue is the six bolts that hold the plate to the back of t=
he gearbox have loosened up. If nobody safety wired them or didn't use any k=
ind of threadlocker on them, this is typically the problem when leaks slowly=
 start in this area. The likelihood of needing to replace the adapter plate i=
s not all that high, assuming the leak is not huge and you have not been dri=
ving the car with copious amounts of oil leaking about.
>=20
> The adapter plate is not part of the overdrive unit, so replacing only the=
 adapter plate is not too difficult. Six nuts hold the OD unit to the adapte=
r plate, remove the nuts from the 4 short studs first, then start working th=
e nuts on the two long studs evenly, and spring pressure should separate the=
 OD unit from the adapter plate. Pay attention to the 8 springs as you slide=
 the OD unit off the mainshaft, when they fall out they like to roll under t=
hings. Place the OD unit aside, other that cleaning the gasket surface you w=
ill not be messing with that.
>=20
> I use the little bottle of Permatex Aviation gasket sealer for gearboxs, s=
eems to work well for me.
>=20
> The six bolts that attach the adapter plate to the back of the gearbox cas=
e are now visible, if these bolts are not properly torqued you just found th=
e source of your leak. Remove them, clean up your gasket surfaces and reseal=
. The same gasket is used here as the non-overdrive gearbox.  Rimmers sells b=
olts specifically for this application, they have threadlocker that is safe f=
or the aluminum case on the threads. They have been working for me. These 6 b=
olts may be safety wired, always a good idea if you don't buy a set of new b=
olts from Rimmers. If you go the safety wire route, pay attention to the par=
ts as it is easy to run the wire in such a way that it fouls when the OD uni=
t is installed.
>=20
> The last adapter plate I bought from Rimmers was embossed with "ORS", I be=
lieve it was made by Overdrive Repair Services, the business started by Layc=
ock employees after Laycock closed their doors. I didn't really compare it t=
o a Triumph adapter plate, but I can see how John Esposito might call it an u=
pgraded adapter plate. If you need one, I'd just order it from Rimmers along=
 with those 6 bolts.=20
>=20
> Assembling the OD unit back onto the gearbox is where the real fun is, you=
 need to line up two sets of splines in the OD unit, compress the 8 springs a=
nd make sure you don't foul the oil pump plunger on the cam. Many ways to ac=
complish this, some are tedious, frustrating, and can completely drive you c=
razy. The easiest way I have found is to safety wire the pump plunger, insta=
ll the pump drive cam and make sure it is pointing away from the pump, apply=
 the sealant to the gasket and place in on the OD unit, align the splines in=
 the OD unit, (a spare OD mainshaft is really helpful with this) and offer u=
p the OD unit to the box. Slowly slide the unit on assuring everything is li=
ned up until the gasket is almost touching the adapter plate. Then, install t=
he nuts and washers on the long studs only a couple of turns. Then you slide=
 the OD unit backwards WITHOUT TURNING the rear flange until it hits the nut=
s. Then you install the 8 springs in their correct position, (shorts go inbo=
ard, longs go outboard) by stuffing them onto their posts on the sliding mem=
ber then levering the other end onto the nubs on the adapter plate. Take a r=
eally good look to make sure you have all 8 springs correctly installed, the=
n tighten the nuts equally to draw the OD unit home. Then install the 4 nuts=
 and washers on the short studs, remove the safety wire on the oil pump plun=
ger, refill with oil and you are good to go.
>=20
> If you run into problems or need to borrow a spare OD mainshaft to line up=
 the splines in the OD unit, feel free to reach out!
>=20
> Henry
>=20
>> On 2023-09-20 19:23, Joe Boruch via Fot wrote:
>>=20
>> I have a leaky a-type OD in my street TR4 that looks like it's leaking fr=
om near the adapter plate.  I have never taken one apart.  Can I just separa=
te the OD from the trans and replace the gaskets or the adapter plate (I've h=
eard that Quantum Mechanics sells an uprated plate and am checking with John=
 to see if he has one) and then reassemble without needing to take the OD ap=
art further?  There is a youtube video that shows an OD being separated and i=
t looks like it is do able.  Thoughts?  JoeB
> _______________________________________________
> fot@autox.team.net
>=20
> http://www.fot-racing.com
>=20
> Donate: http://www.team.net/donate.html
> Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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.net
>=20
> =20

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Thanks all for all the info. &nbsp;I went t=
hru my parts stash and found an OD main shaft. &nbsp;JoeB<br><br><div dir=3D=
"ltr">Sent from my iPhone</div><div dir=3D"ltr"><br><blockquote type=3D"cite=
">On Sep 21, 2023, at 11:35 AM, R. John Lye &lt;rjl6n@cstone.net&gt; wrote:<=
br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF=

        <title></title>


<div class=3D"userStyles" style=3D" font-family: Arial; font-size: 12pt; col=
or: #000000;">Hi Joe B..<br>
<br>
Henry says " you need to line up two sets of splines in the OD unit "<br>
<br>
This is very important, as I learned the hard way the first time that I put<=
br>
an OD back together.&nbsp; I thought that I had the splines line up, but in f=
act,<br>
I only had the first set lined up and snapped a plate tightening it down.<br=
>
<br>
Hope that helps,<br>
John
<footer class=3D"signatureContainer" style=3D"display:inline;">&nbsp;</foote=
r>

<footer class=3D"replyforwardcontainer"><br>
<br>
<span>On Thu, 21 Sep 2023 07:29:34 -0400, yellow04 via Fot &lt;fot@autox.tea=
m.net&gt; wrote:</span><br>
&nbsp;
<p>Joe,</p>

<p>If your gearbox has slowly started leaking around the adapter plate, in a=
ll likelihood the issue is the six bolts that hold the plate to the back of t=
he gearbox have loosened up. If nobody safety wired them or didn't use any k=
ind of threadlocker on them, this is typically the problem when leaks slowly=
 start in this area. The likelihood of needing to replace the adapter plate i=
s not all that high, assuming the leak is not huge and you have not been dri=
ving the car with copious amounts of oil leaking about.</p>

<p>The adapter plate is not part of the overdrive unit, so replacing only th=
e adapter plate is not too difficult. Six nuts hold the OD unit to the adapt=
er plate, remove the nuts from the 4 short studs first, then start working t=
he nuts on the two long studs evenly, and spring pressure should separate th=
e OD unit from the adapter plate. Pay attention to the 8 springs as you slid=
e the OD unit off the mainshaft, when they fall out they like to roll under t=
hings. Place the OD unit aside, other that cleaning the gasket surface you w=
ill not be messing with that.</p>

<p>I use the little bottle of Permatex Aviation gasket sealer for gearboxs, s=
eems to work well for me.</p>

<p>The six bolts that attach the adapter plate to the back of the gearbox ca=
se are now visible, if these bolts are not properly torqued you just found t=
he source of your leak. Remove them, clean up your gasket surfaces and resea=
l. The same gasket is used here as the non-overdrive gearbox.&nbsp; Rimmers s=
ells bolts specifically for this application, they have threadlocker that is=
 safe for the aluminum case on the threads. They have been working for me.&n=
bsp;These 6 bolts may be safety wired, always a good idea if you don't buy a=
 set of new bolts from Rimmers. If you go the safety wire route, pay attenti=
on to the parts as it is easy to run the wire in such a way that it fouls wh=
en the OD unit is installed.</p>

<p>The last adapter plate I bought from Rimmers was embossed with "ORS", I b=
elieve it was made by Overdrive Repair Services, the business started by Lay=
cock employees after Laycock closed their doors. I didn't really compare it t=
o a Triumph adapter plate, but I can see how John Esposito might call it an u=
pgraded adapter plate. If you need one, I'd just order it from Rimmers along=
 with those 6 bolts.&nbsp;</p>

<p>Assembling the OD unit back onto the gearbox is where the real fun is, yo=
u need to line up two sets of splines in the OD unit, compress the 8 springs=
 and make sure you don't foul the oil pump plunger on the cam. Many ways to a=
ccomplish this, some are tedious, frustrating, and can completely drive you c=
razy. The easiest way I have found is to safety wire the pump plunger, insta=
ll the pump drive cam and make sure it is pointing away from the pump, apply=
 the sealant to the gasket and place in on the OD unit, align the splines in=
 the OD unit, (a spare OD mainshaft is really helpful with this) and offer u=
p the OD unit to the box. Slowly slide the unit on assuring everything is li=
ned up until the gasket is almost touching the adapter plate. Then, install t=
he nuts and washers on the long studs only a couple of turns. Then you slide=
 the OD unit backwards WITHOUT TURNING the rear flange until it hits the nut=
s. Then you install the 8 springs in their correct position, (shorts go inbo=
ard, longs go outboard) by stuffing them onto their posts on the sliding mem=
ber then levering the other end onto the nubs on the adapter plate. Take a r=
eally good look to make sure you have all 8 springs correctly installed, the=
n tighten the nuts equally to draw the OD unit home. Then install the 4 nuts=
 and washers on the short studs, remove the safety wire on the oil pump plun=
ger, refill with oil and you are good to go.</p>

<p>If you run into problems or need to borrow a spare OD mainshaft to line u=
p the splines in the OD unit, feel free to reach out!</p>

<p>Henry</p>

<p id=3D"reply-intro">On 2023-09-20 19:23, Joe Boruch via Fot wrote:</p>

<blockquote style=3D"padding: 0 0.4em; border-left: #1010ff 2px solid; margi=
n: 0" type=3D"cite">
<div id=3D"replybody1">
<div>
<div class=3D"v1yahoo-style-wrap" style=3D"font-family: Helvetica Neue, Helv=
etica, Arial, sans-serif; font-size: 13px;">
<div dir=3D"ltr">I have a leaky a-type OD in my street TR4 that looks like i=
t's leaking from near the adapter plate.&nbsp; I have never taken one apart.=
&nbsp; Can I just separate the OD from the trans and replace the gaskets or t=
he adapter plate (I've heard that Quantum Mechanics sells an uprated plate a=
nd am checking with John to see if he has one) and then reassemble without n=
eeding to take the OD apart further?&nbsp; There is a youtube video that sho=
ws an OD being separated and it looks like it is do able.&nbsp; Thoughts?&nb=
sp; JoeB</div>
</div>
</div>
</div>
</blockquote>
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<br>
http://www.fot-racing.com<br>
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et<br>
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