Transmission noise - DualMass or Throwout?

[S.hafsmo]

Just a minor update on this issue. The tranny is off, and the pilot bearing has approx. 0.5-1mm play on the input shaft, compared to the new fluted bearing. The new one is not a tight fit per se, but has very little play. Minor marks on the outer diameter could indicate that it might have rotated a bit, but it's not very evident.
Everyting else seems to be in good condition.

[Marc Haibeck]

I suggest that you should not use the plain or fluted bronze pilot bearing. We have had problems with them spinning in the crankshaft shortly after installation. I recommend the roller pilot bearing. AC-Delco pn CT1078.

It's interesting to note that GM issued a service bulletin in about 1995 recommending the fluted pilot bearing. Then about nine months later the service bulletin was revised for the roller bearing. That was their final recommendation.

[WARP TEN]

Originally Posted by Marc Haibeck

I suggest that you should not use the plain or fluted bronze pilot bearing. We have had problems with them spinning in the crankshaft shortly after installation. I recommend the roller pilot bearing. AC-Delco pn CT1078.

It's interesting to note that GM issued a service bulletin in about 1995 recommending the fluted pilot bearing. Then about nine months later the service bulletin was revised for the roller bearing. That was their final recommendation.

The usual fountain of wisdom. What would this group do without contriubtors like Marc?--Bob

[S.hafsmo]

Appreciate the input, Marc.
I've seen some discussions regarding the use of needle bearing versus the fluted bronze bush, and bought the logic of needle bearing failure could cause input shaft damage. But I'm guessing by your recommendation that no one actually experianced such a failure?

As I've got a bronze bush in hand I'll use it this time, but I'll order a needle bearing. Knowing my luck your predicion will probably come true.