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All you need to know about the M90

There should be a snap ring holding it in place !

Thanks, anyone have the part # for the snap ring? There wasn't one when I pulled the AW71 stuff off the back of the crank.

EDIT: went home for lunch, checked this stuff. This solid metal bushing extends waaaay past the snap ring groove so I will just leave it out and centre the disc in the FW by other means.
 
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The centering tools should also come in other sizes.

The bushing in the middle should be removed if you want to mount the M90 gearbox.

My centering tool fit in the hole without the bushing (I have several tools).
 
When I took my car apart it had the snap ring located bush fitted. It was an M90 equipped engine anyway. Perhaps the bush is used to standardise assembly equipment in the factory.
I don't have a centering tool and found centering it by eye was good enough. It probably isn't as critical on the M90 as the end of input shaft only has to go into the splines on the clutch plate, not the crank bush as well.

I got everything sorted out properly on my car now and drove it again. All seems fine but the clutch pedal needs lowering a bit to make it nicer to drive. It was always high before (compaired with the brake) but now the bite point is higher I can do something about it. Either shorten the pushrod on the pedal or make some spacer shims to go between the bulkhead and the master cylinder.
 
how does it does that? the outside diameter of the bushing is much bigger than the inside diameter of the splined hole in the clutch disc. Is there another (deeper) hole in the crank?
It can center is several ways.

Even in relation to the pressure plate's springs.
 
My centring tool doesn't use the crank at all, just visually centre the driven plate on the clutch cover plate and slap it on the flywheel. Very easy way to do it.
 
Pilot bearing is the right name, but it indeed doesn't have one. Interestingly (or not...:)), that bushing is metal on turbo cars and plastic on NAs...at least in theory...

cheers

James

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stupidest 10 euro's spend ever.. but hey you seem to need it
 
The only thing I could fault with my M90 conversion was that the pedal was too high. I couldn't do anything before as the biting point was already too low, but since I swapped the flywheel and clutch it went up to about half way.
I got the chance to make an adjustable master cylinder pushrod at work today, fitted it when I got home and now it's just right.

Not sure if this is a common problem or just something on my car.
 
The only thing I could fault with my M90 conversion was that the pedal was too high. I couldn't do anything before as the biting point was already too low, but since I swapped the flywheel and clutch it went up to about half way.
I got the chance to make an adjustable master cylinder pushrod at work today, fitted it when I got home and now it's just right.

Not sure if this is a common problem or just something on my car.
What transmission did you have before?

And if it was an M46, did you swap the pedals and the master cylinder as well?
 
the pedal box for pre 90 740's is different from the 940 pedal box already, so if you'd need a different one (which i cant imagine since you can solve a lot of issues with modifying the master/slave cylinder if needed), there isn't a drop in pedal box that works.
 
the pedal box for pre 90 740's is different from the 940 pedal box already, so if you'd need a different one (which i cant imagine since you can solve a lot of issues with modifying the master/slave cylinder if needed), there isn't a drop in pedal box that works.

I will get both boxes out and compare them. I might be up the sewage-fouled water-way without a manual propulsion device * if I did the pedal box last instead of first thing in my M90 swap.

*A clean version of the American expression of doom or huge inconvenience "Up **** creek without a paddle"
 
What I was thinking about was if the master cylinder for the M46 had a different volume than the one in an M90 equipped car.

If so, then it might cause some trouble (the biting point).
 
I was lucky enough to have all the bits to fit straight from another car so they are all M90 spec. Ithough that the parts are all the same, slave cylinder is for sure. Do 700's have plastic clutch pedals ?
I have a Vadis disc and will check some numbers.
 
I was lucky enough to have all the bits to fit straight from another car so they are all M90 spec. Ithough that the parts are all the same, slave cylinder is for sure. Do 700's have plastic clutch pedals ?
I have a Vadis disc and will check some numbers.
OK. So all the bits that you swapped were M90 parts then.

I don't know if 700's have plastic pedals. But all 900's do.
 
Ithough that the parts are all the same, slave cylinder is for sure. Do 700's have plastic clutch pedals ?

I haven't looked at the 700 clutch parts to see what they are like before. As frpe82 says all 900's have the same pedals but there are quite a few different numbers for the master and slave cylinders.
I will have a look at what aftermarket suppliers do, didn't think there were many options although perhaps thats what casues the problems.
 
I haven't looked at the 700 clutch parts to see what they are like before. As frpe82 says all 900's have the same pedals but there are quite a few different numbers for the master and slave cylinders.
I will have a look at what aftermarket suppliers do, didn't think there were many options although perhaps thats what casues the problems.
8601785 (1330248) is the only master cylinder for the M90 gearbox.

6814719 is the only master cylinder for the M46/M47 gearbox.

And...

6843913 is the only slave cylinder for the M90 gearbox.

6843914 is the only slave cylinder for the M46/M47 gearbox.
 
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