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MG MG Y Type - Clutch mystery? HELP!!!

Because of my severely juddering clutch I bought a brand new Borg & Beck 7 1/4" clutch which should be correct for my Y5888.

I now deeply regret saying to the seller that I hoped my car didn't have an 8" clutch because that was obviously tempting fate: of course it has......

That shouldn't be a problem because the seller also has 8" clutches and I can exchange, BUT (and this is a BIG BUT) I thought the first motion shaft for the 8" clutch was thicker, so why does the new 7 1/4" plate fit exactly on the splines?

What are the correct dimensions of the parts and how do I measure the correct thicknesses? On the splines the shaft coming out of the gearbox measures exactly 1", inside the splines 8/10" (which would make 4/5"?).
The tip going into the flywheel measures 16mm or approx. 3/5".

Please don't tell me I have an SC2 engine coupled to an old type SC gearbox, but shouldn't worry because such a plate was fitted to the Fairfield 1.5 special and I just have to be prepared to search autojumbles for it, because in Holland we didn't get that car ;^)
Willem van der Veer

Willem,
Not an answer to your question!, but with clutch judder it is always worth checking the engine mounts and engine steady, see if you can rock the engine side to side.
I found I had spongy engine mounts possibly the reaction of all the oil on them, but when replaced the judder disapeared.
Steve Randle

Thanks Steve, I've noticed that judder-cause too when "researching" my clutchproblem; will fit new rear rubbers.
Willem van der Veer

I've finally reached my supplier (he is working very luxurious times...) and he measured inside the 8" splines and fortunately the figures match; no mystery, no problem.
Willem van der Veer

Willem-
To the best of my recollection, you can fit either an early gbox (71/4), or a later 8" to any engine. The only changes are to the bell housing, to suit the clutch size of the engine.
Paul
Paul Gaynor

On the TD board Bob Jeffers' respons was:

<<Willem I think the shaft that goes through the bell housing to actuate the throw-out bearing is what is different. The smaller clutch had a 3/4 in. shaft and the 8" clutch had a 7/8" shaft. There was a way the bigger shaft could be ground down so it could be used with thw smaller clutch.

I hope this helps.
Bob>>

These dimensions caused my panic. I really must stop reading everything about XPAG's without fully understanding the technical terms used....
Willem van der Veer

Willem: Steve is right to point out the need to check the engine steady bracket - I found mine was completely broken, having fatigued just above the point at which it bolts to the cross-member. A weld fixed it. It's amazing how much judder is created when the steady bar is not working.
Tim Griggs

This thread was discussed between 09/07/2007 and 16/07/2007

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