Since you have only 'heard' about 30 weight, and both your manuals and mine
say use the same oil you use in the engine, seems to make sense to stick
with engine oil. And the gearbox and o/d share the oil.
PaulH.
----- Original Message -----
From: Peter Schauss <schauss@worldnet.att.net>
To: <mgs@autox.team.net>
Sent: Monday, April 24, 2000 3:03 AM
Subject: Overdrive question oil type and relief valve construction
> I installed a '77 or '79 model overdrive (type LH) on my
> '80 MGB about six months ago and have a couple of
> questions about it:
>
> 1. What type of oil are you supposed to put into the MGB
> gearbox/overdrive? The original owner's manual for my car says to
> put in the same type of oil as you put into the engine. Before installing
> the overdrive I was using Castrol GTX 10w40 in the gearbox and
> I used the same initially when I put in the overdrive. I have since
> heard that you should use only nondetergent straight 30 weight
> oil in an overdrive.
>
> 2. When I changed the oil in the gearbox/overdrive, I tried to
> follow the instructions in the manual for cleaning the filter
> on the relief valve. On removing this collection of springs
> and other bits, I found that it looks quite different from
> the illustrations in the manuals and the Moss catalog (p. 43 -
> MGB-13).
>
> What I have is roughly as follows:
>
> The whole setup is surrounded by a cylindrical mesh
> screen which seems to be intended to keep out the large
> bolders.
>
> Going from top to bottom:
>
> A plunger with a hole down the middle and a flange at one end.
> Inside of this there is a small ball bearing held in place by a small
> spring.
>
> A larger spring.
>
> Some shims or thin washers.
>
> A tube with another piece which fits inside of it. The inside piece
> sticks up a bit and has a slot in the top. There is a fine mesh screen
> which surrounds the bottom of this part and is, I assume, the part
> that I was supposed to clean. ( I did.)
>
> The plug which holds all of this in place and has a small o-ring
> set into groove cut into its top surface.
>
> The overdrive worked fine after I reassembled all of the above bits
> and filled it with my usual 10w40, so I assume that I have all of the
> pieces I am supposed to have. Can anyone tell me what this
> device is supposed to do and how I will know if it is not working
> properly?
>
> Thanks,
>
> Peter Schauss
> Long Island, NY
> 1963 BJ7
> 1980 MGB
>
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