nts472

I don't quite understand what you mean. The clucth disk is mechanically coupled to the input shaft all the time.

As far as compatibility, they are the same, at least in diameter and spline count, and I assume length.

600whpA4

1.8t and 2.8 transmission are exactly the same 01A transmission. Only difference between them is the actual ratio of each of the gears. Both even have the same 3.889 final drive.

The spline is pretty much the same in all of the Audi cars. This is why people can put 01E's into their 1.8t while still using their 1.8t clutch/flywheel.

nts472

FYI, I'm not using the OEM pilot, I had to grind the auto crank down to fit a 43mm outer, 15mm inner bearing to accommodate the transmission.

This doesn't seem to be the issue however, because I've been trying most of my tests with no pilot bearing installed to rule it out. With or without it feels the same.

nts472

I put the transmission up with no pp and it works fine, so that rules out the input spline

I also tried shimming the pivot ball about 3mm and it did cause the PP to release further, sort of rulling out the release arm geometry.

I also greased and honed the splines on each other (input shaft and clutch disk), didn't help.


So it boils down to clutch disk binding on something. I have no clue as to what. As I said it releases freely on a press but not sideways mounted on the engine.

600whpA4

You are using the low profile flywheel bolts and not the OEM ones right?


Also did you make sure you installed the disk the correct side facing the flywheel?

nts472

SOLVED..ehh i think

I pulled out the pp and disk and noticed there was glazing on the inner edge of the flywheel.. which would be consistant with dragging but the catch...

the clutch disk was glazed only on 1/4 of the inner edge.. flipping it on its side i noticed the disk was bent

While i'd like to believe it came like that its likely happened by misalignment or letting the tranny hang on the engine a bit unbolted

My next worry is.. since this stuff has been going together fine with a bent disk is my input shaft bent too?? I dosen't appear so by eye.

s4master1

Stop guessing around
since you are using a different flywheel and obviously the supplier was not informed enough to advise you of the bolts and disc to use
the problem is that the disc is hitting the flywheel to crankshaft bolts preventing from turning
both transmission, clutches and hydraulics are the same
you did the right test except you forgot to test bench the assembly with the bolts on
to avoid this and future issues with the flywheel just install the dual mass original unit
we don't see any benefit from using a light weight unit and don't care what anybody says

600whpA4

A bent clutch disk usually happens when the disk is not aligned correctly and the transmission is forced in toward the block when installing it.

It would be very hard to cause the input shaft to be bent.