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Can't add much to Henrys excellent dissertation on the A-type, except to c=
heck the plate for bend/warpage @ the bottom between the 2 lower fasteners.
Glen Efinger
On Thursday, September 21, 2023 at 08:10:31 AM EDT, yellow04 via Fot <f=
ot@autox.team.net> wrote: =20
=20
=20
Joe,
If your gearbox has slowly started leaking around the adapter plate, in all=
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 =
kind of threadlocker on them, this is typically the problem when leaks slow=
ly start in this area. The likelihood of needing to replace the adapter pla=
te is not all that high, assuming the leak is not huge and you have not bee=
n driving the car with copious amounts of oil leaking about.
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 t=
he nuts on the two long studs evenly, and spring pressure should separate t=
he OD unit from the adapter plate. Pay attention to the 8 springs as you sl=
ide the OD unit off the mainshaft, when they fall out they like to roll und=
er things. Place the OD unit aside, other that cleaning the gasket surface =
you will not be messing with that.
I use the little bottle of Permatex Aviation gasket sealer for gearboxs, se=
ems to work well for me.
The six bolts that attach the adapter plate to the back of the gearbox case=
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 resea=
l. The same gasket is used here as the non-overdrive gearbox.=C2=A0 Rimmers=
sells bolts specifically for this application, they have threadlocker that=
is safe for the aluminum case on the threads. They have been working for m=
e.=C2=A0These 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 a=
ttention to the parts as it is easy to run the wire in such a way that it f=
ouls when the OD unit is installed.
The last adapter plate I bought from Rimmers was embossed with "ORS", I bel=
ieve 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 =
to a Triumph adapter plate, but I can see how John Esposito might call it a=
n upgraded adapter plate. If you need one, I'd just order it from Rimmers a=
long with those 6 bolts.=C2=A0
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 =
and make sure you don't foul the oil pump plunger on the cam. Many ways to =
accomplish this, some are tedious, frustrating, and can completely drive yo=
u crazy. The easiest way I have found is to safety wire the pump plunger, i=
nstall 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 spli=
nes in the OD unit, (a spare OD mainshaft is really helpful with this) and =
offer up the OD unit to the box. Slowly slide the unit on assuring everythi=
ng is lined up until the gasket is almost touching the adapter plate. Then,=
install the nuts and washers on the long studs only a couple of turns. The=
n you slide the OD unit backwards WITHOUT TURNING the rear flange until it =
hits the nuts. Then you install the 8 springs in their correct position, (s=
horts go inboard, longs go outboard) by stuffing them onto their posts on t=
he sliding member then levering the other end onto the nubs on the adapter =
plate. Take a really good look to make sure you have all 8 springs correctl=
y installed, then tighten the nuts equally to draw the OD unit home. Then i=
nstall the 4 nuts and washers on the short studs, remove the safety wire on=
the oil pump plunger, refill with oil and you are good to go.
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!
Henry
On 2023-09-20 19:23, Joe Boruch via Fot wrote:
I have a leaky a-type OD in my street TR4 that looks like it's leaking from=
near the adapter plate.=C2=A0 I have never taken one apart.=C2=A0 Can I ju=
st separate the OD from the trans and replace the gaskets or the adapter pl=
ate (I've heard that Quantum Mechanics sells an uprated plate and am checki=
ng with John to see if he has one) and then reassemble without needing to t=
ake the OD apart further?=C2=A0 There is a youtube video that shows an OD b=
eing separated and it looks like it is do able.=C2=A0 Thoughts?=C2=A0 JoeB
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
m
=20
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<html><head></head><body><div class=3D"ydp4bd37dfeyahoo-style-wrap" style=
=3D"font-family:Arial, Helvetica, sans-serif;font-size:16px;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">Can't add much to Henrys exc=
ellent dissertation on the A-type, except to check the plate for bend/warpa=
ge @ the bottom between the 2 lower fasteners.</div><div dir=3D"ltr" data-s=
etdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">Glen Efing=
er<br></div><div><br></div>
=20
</div><div id=3D"ydp973cd0bcyahoo_quoted_5832845229" class=3D"ydp97=
3cd0bcyahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Thursday, September 21, 2023 at 08:10:31 AM EDT, yel=
low04 via Fot <fot@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"ydp973cd0bcyiv7765969694"><div>
<p>Joe,</p>
<p>If your gearbox has slowly started leaking around the adapter plate, in =
all likelihood the issue is the six bolts that hold the plate to the back o=
f the gearbox have loosened up. If nobody safety wired them or didn't use a=
ny kind of threadlocker on them, this is typically the problem when leaks s=
lowly start in this area. The likelihood of needing to replace the adapter =
plate is not all that high, assuming the leak is not huge and you have not =
been driving the car with copious amounts of oil leaking about.</p>
<p>The adapter plate is not part of the overdrive unit, so replacing only t=
he adapter plate is not too difficult. Six nuts hold the OD unit to the ada=
pter plate, remove the nuts from the 4 short studs first, then start workin=
g the nuts on the two long studs evenly, and spring pressure should separat=
e 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 things. Place the OD unit aside, other that cleaning the gasket surfa=
ce you will not be messing with that.</p>
<p>I use the little bottle of Permatex Aviation gasket sealer for gearboxs,=
seems to work well for me.</p>
<p>The six bolts that attach the adapter plate to the back of the gearbox c=
ase are now visible, if these bolts are not properly torqued you just found=
the source of your leak. Remove them, clean up your gasket surfaces and re=
seal. The same gasket is used here as the non-overdrive gearbox. Rimm=
ers sells bolts specifically for this application, they have threadlocker t=
hat is safe for the aluminum case on the threads. They have been working fo=
r me. 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, pa=
y attention to the parts as it is easy to run the wire in such a way that i=
t fouls when the OD unit is installed.</p>
<p>The last adapter plate I bought from Rimmers was embossed with "ORS", I =
believe it was made by Overdrive Repair Services, the business started by L=
aycock employees after Laycock closed their doors. I didn't really compare =
it to a Triumph adapter plate, but I can see how John Esposito might call i=
t an upgraded adapter plate. If you need one, I'd just order it from Rimmer=
s along with those 6 bolts. </p>
<p>Assembling the OD unit back onto the gearbox is where the real fun is, y=
ou need to line up two sets of splines in the OD unit, compress the 8 sprin=
gs and make sure you don't foul the oil pump plunger on the cam. Many ways =
to accomplish this, some are tedious, frustrating, and can completely drive=
you crazy. The easiest way I have found is to safety wire the pump plunger=
, install the pump drive cam and make sure it is pointing away from the pum=
p, apply the sealant to the gasket and place in on the OD unit, align the s=
plines in the OD unit, (a spare OD mainshaft is really helpful with this) a=
nd offer up the OD unit to the box. Slowly slide the unit on assuring every=
thing is lined up until the gasket is almost touching the adapter plate. Th=
en, install the 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 nuts. Then you install the 8 springs in their correct position,=
(shorts go inboard, longs go outboard) by stuffing them onto their posts o=
n the sliding member then levering the other end onto the nubs on the adapt=
er plate. Take a really good look to make sure you have all 8 springs corre=
ctly installed, then tighten the nuts equally to draw the OD unit home. The=
n install the 4 nuts and washers on the short studs, remove the safety wire=
on the oil pump plunger, 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 =
up the splines in the OD unit, feel free to reach out!</p>
<p>Henry</p>
<div id=3D"ydp973cd0bcyiv7765969694yqt63037" class=3D"ydp973cd0bcyiv7765969=
694yqt6897648342"><p id=3D"ydp973cd0bcyiv7765969694reply-intro">On 2023-09-=
20 19:23, Joe Boruch via Fot wrote:</p>
<blockquote type=3D"cite" style=3D"padding:0 0.4em;border-left:#1010ff 2px =
solid;margin:0;">
<div id=3D"ydp973cd0bcyiv7765969694replybody1">
<div>
<div style=3D"font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font=
-size:13px;" class=3D"ydp973cd0bcyiv7765969694v1yahoo-style-wrap">
<div dir=3D"ltr">I have a leaky a-type OD in my street TR4 that looks like =
it's leaking from near the adapter plate. I have never taken one apar=
t. Can I just separate the OD from the trans and replace the gaskets =
or the adapter plate (I've heard that Quantum Mechanics sells an uprated pl=
ate and am checking with John to see if he has one) and then reassemble wit=
hout needing to take the OD apart further? There is a youtube video t=
hat shows an OD being separated and it looks like it is do able. Thou=
ghts? JoeB</div>
</div>
</div>
</div>
</blockquote></div>
</div></div><div class=3D"ydp973cd0bcyqt6897648342" id=3D"ydp973cd0bcyqt083=
11">_______________________________________________<br clear=3D"none"><a sh=
ape=3D"rect" href=3D"mailto:fot@autox.team.net"; rel=3D"nofollow" target=3D"=
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http://www.fot-racing.com
Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot
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