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MG MGB GT V8 Factory Originals Technical - V-8 Clutch arm pivot length

On my newly purchased book HOW TO IMPROVE MGB, MGC & MGB V8 by Roger williams page# 42 illustration D10 the dimention of the clutch arm pivot post is 1.5 inches. I went out and checked my SD1 5 speed trans for this dim. And it is 1 and 5/8th. inch. or 1/8 in. longer. What effect this dicrepancy will have on the clutch release action if any. Do i have to shorten this post?, and what would be the best way to do this. Has anybody ran into this issue before?

There are if my memory is correct three different pivot pin lengths. (To cater for the wide range of variations the gearbox was used in.) The crux is to keep the set thatw as taken from the donor. In any event it is a good idea to dry test the system before fitting the engine/trans into the car. I know of several who have arrived at engine start and then find no clutch.

The relaese arms are all the same basic dimension even though later ones ahve more metal to assists in not splitting which some of the early ones did.

The release bearings are all the same, but there are two different lengths of carrier. Current styles of bearing now come with the bearing moulded into the carrier whereas earlier carriers were cast and you could change just the bearing.

Roger Parker

Thanx Roger, I suspect my 5 speed came from a tr7, a friend of mine has a tr8 trans and motor are out at this point i will check agaist his set up and confirm this dimentions.

It is confirmed. I checked the 2 post side by side and they are different the TR8 post is 1-1/2" and the TR7 is 1-11/16", I now the release bering is the same to all applications. Are the carriers also different? mine measures 2-3/4" over all from base of carrier to face of bearing on the pressure plate side. Roger Williams gives a dim. of 2" overall. my confusion is whether the dimention was taken from the base of the carrier to thre face of bering on the pressure plate side or the face of the bearing on the trans. side.

I presently have on the floor a box that has come out of a 3500cc rover sd1,if you are still stuck and you want me to compare please let me know and i will measure it for you

Dave. Thankyou for your offer, yes it would be a great help if you can confirm this dimentions. Also if you have the throwout bearing on the collar it will be great to have this dimention. As I stated before the dimention i got on mine is 2-3/4" overall that is from the base of the collar to the face of the bearing on pressure plate side. Thanks again.

This thread was discussed between 23/09/2000 and 09/10/2000

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