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RE: Overdrive problem.....

Subject: RE: Overdrive problem.....
Date: Mon, 11 Feb 2002 07:59:38 -0500
Not only having enough oil into the gearbox, but also the correct weight off
the oil is important. Use the same oil as the engine uses, provided you put
correct oil into the engine...



'71 BGT no od

-----Original Message-----
From: Max Heim []
Sent: Sunday, February 10, 2002 10:08 PM
To: MG List
Subject: Re: Overdrive problem.....

Part of the OD operation is hydraulic, so I am not surprised that low oil
would have an effect. Read up on it in the manual -- I admit it's a little
difficult to grasp. But I wouldn't assume an internal problem based on the
evidence so far.

on 2/10/02 6:56 AM, at wrote:

> Could be electrical, and should be the first thing to check anyway.
> ignition (white) is fed to the manual switch on the dash, which feeds it
> down on a yellow (my diagrams show it changing to a yellow/red at a bullet
> connector) to the lockout switch on top of the gearbox, which when in 3rd
> and 4th feeds it on a yellow/purple to the solenoid.  I would be surprised
> if that amount of oil made the difference between working and no-working,
> it (the problem) may come back. If you can cause it to switch in and out
> just by pulling the lever around when in 4th it is almost certainly either
> the switch on top of the gearbox being loose or worn, wear can be
> accomodated by removing one of the shims.  On the other hand if that
> of oil *does* make the difference, then I would imagine there is something
> marginal inside the o/d.
> ----- Original Message -----
> From: "Mark Smith" <>
> To: <>
> Sent: Sunday, February 10, 2002 9:37 AM
> Subject: Re: Overdrive problem.....
>> Gurus of the MG list.....
>> Whilst out motoring today my overdrive started dropping in and out. I'd
> been
>> blasting around for a few hours when this malady occured....The car was
>> sitting at about 60mph and would suddenly drop out of O/D then  back in.
>> tested it a couple of times with no ill effects. It proceeded as
> prescribed
>> or another half an hour then dropped out and this time refused to come
> back
>> on.
>> Consulting the trusty workshop manual revealed dire warnings about
> removing
>> engines to access O/D units and the like..You know the sort of scary
>> you dont do unless you really have too. Anyway I noticed in the
>> troubleshooting section a mention about checking the gearbox oil level as
>> this can have a bearing on the operation of the O/D..Sure enough the
>> was a tad low.......I filled it up...adding about 300ml and its now
> running
>> fine. My question is in your collective experiance have I solved the
> problem
>> or is there a serpent lurking in my gearbox waiting to strike my
> wallet????
>> The car is a 68 MGB Mk1.....


Max Heim
'66 MGB GHN3L76149
If you're near Mountain View, CA,
it's the primer red one with chrome wires

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