3 replies to this topic

[not-a-number]

So Ive done an engine transplant from 850 to 1000. It is a missmatch of parts. The gearbox is a 4 sync magic wand from a spare 850 i have, the flywheel clutch pressure plate and ali housing (that holds the clutch fork) are from the original 850 that was in the car. Then thats all mounted to the 1000cc 1980s LE engine.

 

The clutch was not juddering when it was on the original engine and gearbox. It is now juddering like crazing! I replaced the main crank seal and I see no oil leaking from the drain hole. The clutch feels fine in terms of where it engages in the pedal stroke. 

 

I have adjusted the bolt on the clutch fork to the correct gap. 

I have not adjusted the big nuts that hold the thrust bearing. What should I do for this?

 

I did semi fix it by slipping it like crazy but that only lasted about a week and its not really a good solution.

 

Could the fact that it is a different flywheel for that engine mean its not square? Could it have bolted up on bit of an angle? Should I pop it off and turn it around 180 degrees and make sure theres no potential bumps in the crank taper?

 

Also I just put the pressure plate on randomly as I didnt see any marks. Does this matter?

 

Could it be something other than the clutch?

 

[Cooperman]

Clutch judder is normally a sign that there is some oil on the clutch centre plate. It has happened even when brand new centre plates have become slightly contaminated with a small amount of oil or grease during assembly.

There is no way the flywheel could have been bolted on 'at an angle'. It won't be the overthrow nuts either, although they do need to set correctly.

You cannot turn the flywheel around 180 degrees as it only goes in one position to line up the slot with the slot in the end of the crankshaft and that is located by the washer with the raised portion.

Presumably you applied the correct torque to the flywheel bolt and it is not loose. However, if it was loose you would have a horrendous vibration when the engine is running.

Unless you have a fully balanced engine the position of the diaphragm spring is not important.

You need to take it to pieces and fit a new and clean centre plate, then set it all up accurately. Clean everything with Brake 7 Clutch Cleaner before re-assembly.

[not-a-number]

Thanks for the reply.

 

I didnt put any lube on the clutch spline at all. Should I really have put a tiny bit of carbon powder or copper grease on it? Theres a 66% chance that I didnt line up the 'A' marks on the pressure plate/flywheel.

 

If I am to do this properly what needs to be done?

New clutch plate.

Get the flywheel and pressure plate skimmed 

New thrust bearing.

 

Or since it wasnt juddering before does that imply the flywheel and pressure plate are good and not warped?

[Cooperman]

Do not attempt to skim either the flywheel or backplate. That would ruin the delicate settings which the Mini clutch system has.

The thrust bearing will not cause judder. If it is worn out it will whine when the pedal is pushed down.

The flywheel and backplate will never warp.

Judder is normally caused by a bit of oil or grease on the centre plate, so change that for a new one.