Questions about clutch chatter...T56....

[80LS1T]

Ok I installed a "Centerforce Dual Friction" set in my 93' LT1/T56 drivetrain when I installed my engine. Now after about 1000 miles on the drivetrain there is some clutch chatter. When I press the clutch pedal down a little bit the chatter goes away....? All I need is small about of pressure applied to the pedal and its gone. To me that sounds like a throw out bearing? Im not a tranny gurue(sp?) though!

 

I went to the centeforce webpage and this is what they gave as possible causes(the ones in red are ones I have eliminated)

 

WHAT COULD BE THE CAUSES FOR CLUTCH CHATTER?

 

CHATTER PROBLEMS CAN BE CAUSED BY MANY PROBLEMS. POSSIBLE CAUSES MAY BE AS FOLLOWS:

 

*FLYWHEEL HAS EXCESSIVE RUN-OUT.

*FLY WHEEL WAS NOT RESURFACED BEFORE THE NEW CLUTCH WAS INSTALLED.

*FLYWHEEL WAS RESURFACED IMPROPERLY OR HAS IMPROPER SURFACE FINISH.

*FLYWHEEL HAS SEVERE HARD SPOTS OR HOT SPOTS.

*FLYWHEEL RESURFACED IMPROPERLY (I.E. INCORRECT FLYWHEEL STEP).

*DAMAGED OR EXCESSIVELY WORN CV JOINTS.

*BAD U-JOINTS IN DRIVE SHAFT OR U-JOINTS MISALIGNED.

*EXCESSIVE BACKLASH IN DIFFERENTIAL.

*EXCESSIVE DRIVE-LINE ANGLE.

*BAD LEAF SPRINGS, BUSHINGS OR MOUNTS.

*IMPROPER GEAR RATIO VERSUS TIRE DIAMETER.

*DEFECTIVE PRESSURE PLATE AND/OR DISC.

*DISC HAS INADEQUATE OR NO MARCEL (NOT ENOUGH CUSHION BETWEEN THE FRICTION FACINGS).

*OIL OR GREASE CONTAMINATION ON CLUTCH FACINGS.

*WORN OR DAMAGED CLUTCH LINKAGE.

*BENT COVER ASSEMBLY AND/OR DISC .

*IMPROPERLY TUNED ENGINE.

*WORN OR DAMAGED ENGINE MOUNTS OR TRANSMISSION MOUNTS.

 

REMEMBER IF YOU HAVE ANY QUESTIONS, PLEASE CALL OUR TECH. LINE (928) 771-8422

 

Now I do have an oil leak at the back of the block....I pulled the tranny tonight but I didnt/couldn't get the fly wheel off so I couldnt verify where exactly the leak is. Now I am curious if maybe my clutch is contamined with oil and that is causing it to chatter? Has anyone run it to that? It doesnt appear to be soaked in oil though...

 

There are also some hot spots on the flywheel, could that cause some chatter? Im not sure if it is really extreme though? I could take pics if you guys think it would help?

Thanks,

 

Guy

[80LS1T]

Come doesnt anyone here do tranny work?

 

 

Guy

[Tim240z]

Did you replace the crank bushing/bearing and throwout bearing? If not:

:malebitchslap:

 

Tim

[80LS1T]

Yeah I installed new pilot bushing but it wasnt a roller type like the stock one was....I am going to get a new one from GM and install that before the tranny goes in.

 

The throw out bearing came with the clutch set up so that was also new.

 

I am going to clean up the clutch assembley, install a new throw out bearing, and reinstall everything this weekend. I wont know if it fixed it though for a while since I still have to send out my headers for coating!

 

From what I can tell the TB doesnt look damaged. I did get the oil leak right around when I started to hear the noise which is why I am wondering if that is causing my noise?

*OIL OR GREASE CONTAMINATION ON CLUTCH FACINGS.

[Guest JAMIE T]

LT1/T56 are known for clutch chatter. My Z28's stock clutch chattered. My new(about 3K miles) SPEC clutch along with the aluminum flywheel doesn't make any noise. I did replace the TO bearing, but I don't think I replaced the pilot bearing.

[80LS1T]

Well Im not overly concerned but its just kind of annoying. Its one of those things that annoys the driver/owner but no one else notices! You know what I mean?

 

Who knows maybe the new pilot bearing will fix it?

 

 

Guy