Squealing sound when applying the clutch

Groesbeck Hurricane · 06-23-2003, 12:31 PM

POSTED ON THE RE-BUILD FORUM::

I finally had time to work on the Porsche yesterday. I double checked all the oil and electrical connections. Replaced some fuses and did a once over. I have a borrowed video recorder so I verified that the clutch is moving the throw out arm. I primed the injectors and started her right on up. Everything appeared fine. I depressed the clutch pedal and heard a loud squealing.

Any ideas on what could be causing the squealing? Did I get the tension on the cable too tight or too loose? Is it possible I did not get the bottom of the fork in the channel so that the bottom of the plate is still partially connecting with the disk?

I verified the top of the fork was engaging, but could not see into the botom.

Groesbeck Hurricane · 07-08-2003, 07:13 PM

Finally got some time so I took the motor back out. My wife was back in town so we put the motor back in while double verifying the placement of the fork. We then adjusted the clutch to 25 cm travel and turned the dear over. Started easily and started squealing.

I feel even more certain that the bottom of the throw out fork is in. I believe the squealing is coming from the area of the clutch plate. When the clutch is depressed, the squealing stops. When the car is idling over 1100 RPM the squeal generally goes away. I did drive her down the street and back. Response was good and I did notice the squeal at idle.

Any ideas???

marcesq · marcesq's Garage

David:

Did you double check the throwout bearing and those thin spacers that go on the outside of the pressure plate?? Maybe one is missing and the TOB is rubbing the PP.

Did you grease the guide tube with molygrease??

Warped clutch plate??

Did you pack the pilot bearing with grease??

Sorry alot of questions, and no answers.

Groesbeck Hurricane · 07-09-2003, 07:10 AM

Marc,

No problem! Asking for details helps diagnose, sorry for not including them.

There was no squeal before I took the motor out to fix leaks. There was no squeal the first two times I re-installed the motor until I depressed the clutch. I could not tell the what was wrong with the first installation, but the clutch did not want to engage. I assume I completely missed or incorrectly positioned on the bearing? The second time seems to have found the fork engaging the top of the bearing but not the bottom?

The third (and most recent time) I had the assistance of my wife and was able to fully ensure the distance of travel of the clutch cable as well as keep a good eye on the baby. This was also the easiest mating of motor and tranny I have ever had. The shifting is normal and has a good feel to it. The sqealing goes away at higher RPMs or when the clutch is depressed. Could I have too little clearance on the bolt and arm under the transmission? I will check that tonight!

I took the Pressure Plate, Disc, and Throw-out bearing off the car but left the flywheel attached. I marked the plate, disk, and the block and re-installed per marks.

The guide tube had been greased (hi-temp grease, not moly grease), pilot bearing was packed when installed new about 30K ago. I did not check the clutch plate for warping.

marcesq · marcesq's Garage

After this I am out of ideas . . . . if you have adjusted the small arm out too far and the TOB is actually pushing slightly on the Pressure Plate, thereby slightly disengaging the clutch, this might cause sqealing, but if this was the case, the clutch would be slipping at higher rpms. So I'm stumped without being there to look and listen.

Sorry.

Groesbeck Hurricane · 07-09-2003, 08:11 AM

Marc,

Not a problem! I do appreciate the ideas. I do not know if the clutch is slipping at high RPMs. Thinking back I do not think I took the baby over 3500 RPM. But you did get me to wonder about the small arm adjustment. I'm going there tonight! You might just well have stumbled on what I did wrong. This time. :-)

Groesbeck Hurricane · 07-10-2003, 06:50 AM

Adjusted the clearance to the small arm, it was WAY out of spec. The little things, I missed the little things. Drove the baby last night and noted a slight squeal at idle. I went back to look at her and noted the helper spring that goes to the small arm was missing. I'm going to a local shop to try and find some springs today. This might solve all issues...

Anyone have any other ideas? Acceleration is great, lost two drops of oil (found on the floor after the drive) so the leaks are really minimized, the roar of the six was nice, and then the slight squeal that showed up twice. It was the only distraction and the only reason she is not my daily driver today...