I had the exact same problem. It turns out that all of the seals in the
overdrive had hardened and were not sealing. There was enough leakage
through the seals that it would go into overdrive by itself - just like
yours. I took the overdrive to a mechanic and had it gone through -
replaced all seals and one bearing that was fairly worn. I don't know if
you can replace all of the seals while the unit is still in the car.
Glenn Mapes <gmapes@ball.com>
1968 MGB
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From: mgs-owner
To: mgs
Cc: whauss
Subject: Late MGBGT overdrive
Date: Thursday, August 03, 1995 9:22PM
If this has been discussed before, please send me a copy of any helpful
information. I am new to the list.
I have a 74 1/2 MGBGT with overdrive. After about 10-15 miles, the
overdrive
'automatically' goes into overdrive. It works just fine when first starting
out. Other symptoms are;
* When under load it switches back out of overdrive (normal, no OD)
* When overunning the engine it goes into overdrive in all gears (even
first)
* I get stuck in parking spaces because I loose reverse after driving for
a while.
* Everything is back to normal after about a half hour of inactivity.
Because it works when first starting out, I hope not to pull the engine.
After
all the gears, clutch, etc should be OK. Don't you think?
The oil level is OK. I use the engine oil, the green British stuff, for
the transmission. The solenoid is OK.
I sure would like not to have to pull the engine and would appreciate
any help.
Werner
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