Clutch Chatter

[markjohnson]

Is that one of those plastic throwout bearings?

[Bill Pritchard]

<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: markjohnson</div><div class="ubbcode-body">Is that one of those plastic throwout bearings? </div></div>

The center collar portion is definitely some type of non-ferrous material, possibly some type of plastic. The actual bearing portion is steel.

So this is the proper way for the bearing to be installed?



To be perfectly honest, it may have been that way when it was in the car.....in the pictures I posted yesterday, I may have reinstalled it with the tangs on the outside of the collar. It has been over 30 years since I have installed a throwout bearing on a GM product, so I really don't remember how I used to do it.

One other thing I noticed today, the collar portion is not perfectly concentric with the bearing portion...





And finally, to address William's post about the motor mounts....for at least 6 years prior to last October, this car had a different clutch and transmission in it - with the same motor mounts that are in it now - and there was no chattering at that time. It was an excellent and interesting point to bring up, but I think it does not apply to this car.

Thanks so much for all replies thus far!

[earntaz]

The fork is now installed on the bearing correctly ... does the bearing turn freely? Seems to be a lot of scoring on the bearing surface or in just might be the picture. IMHO -- see if you can locate a throwout bearing that is all metal ...

[Postsedan]

Yep...ditto....I would get an all metal Throwout Bearing.

Dan

[markjohnson]

Gotta agree about an all metal bearing with a light coating of Anti-Seize on the input shaft bearing snout. TO bearings are cheap but are a laborious job to change if they need it. It's also a VERY good idea to adjust the clutch linkage exactly to the Assembly or Service Manual. I've never understood why so many people just kind of guess at it! As clutch wear occurs, the diaphragm fingers extend towards the rear of the car and put them into full-time contact with the TO bearing face.

[SS427]

We recently had a car in the shop getting quite a makeover and this car also had clutch chatter. Upon disassembly we found the the previous mechanic installed the starter wiring harness bellhousing clip in BETWEEN the bellhousing and engine flange not behind the bellhousing bolt as was intended. This bound the transmission input shaft and scored the pilot bushing. The other symptom was that it kept locking up between shifts. Check everything.

[Bill Pritchard]

Yes, the bearing spins and pivots freely mounted as shown in that last picture. I will be ordering a whole new clutch kit (probably a Hays since that seems to be Dan's favorite [img]<<GRAEMLIN_URL>>/grin.gif[/img] ) and hopefully that will have an all metal bearing. I have anti-seize for the input shaft bearing snout. Thankfully both the starter wiring harness clip and the speedo cable clip were properly mounted directly under their respective bolt heads.

Thanks again, gents [img]<<GRAEMLIN_URL>>/worship.gif[/img]

[earntaz]

Maybe your jobber who is supplying the Hays clutch assembly will include the correct throwout bearing. In many cases, a diaphragm clutch and three finger clutch will require a matching throwout bearing...TAZ

[Bill Pritchard]

Yes, the clutch kit includes a new bearing.

[Bill Pritchard]

The new Hays clutch kit arrived yesterday, and the throwout bearing is all metal [img]<<GRAEMLIN_URL>>/biggthumpup.gif[/img]