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CLUTCH CHATTER PROBLEM.

I HAD THE SAME PROBLEM WITH CLUTCH CHATTER AFTER I HAD MY 65 PONTIAC ENGINE 4 SPEED TRANS AND CLUTCH REBUILT. WHAT A NIGHTMARE! I WENT THRU 3 DISCS AND 2 PRESSURE PLATES, HAD ALL CHECKED. NEW EVERYTHING AND FINALLY FOUND OUT AFTER RECHECKING ALL, THE INPUT PILOT SHAFT HAD A NEW BEARING INSTALLED, AND THE OUTSIDE DIA SNAP RING WHEN INSTALLED ON THE NEW BEARING WAS .025"/.035" LARGER ON ITS O.D. THAN THE SNAP RING RECESS GROOVE IN THE PILOT SHAFT / THROWOUT BEARING NOSE END HOUSING MOUNTING FACE THAT HOLDS THE THOWOUT BEARING CENTERED AND SQUARE TO THE PRESSURE PLATE FINGERS, THIS CAUSED THE HOUSING TO TILT A BIT. IT MAY HAVE CAUSED THE ALUMINUM BELL HOUSING TO SHIFT??? THERE IS A .030/040" THICK GASKET UNDER THE HOUSING FACE AT ASSEMBLY, AND IT HID THE NOSE HOUSING TILT PROBLEM, WHICH CAUSED THE CHATTER. I EVEN TOOK APART THE NEW DIPHRAGM PRESSURE PLATE AND REMACHINED THE FRONT FACE AND THE BACK RADII WHERE THE DIAPHRAGM RIDES. ALL THEN WAS PERFECT, ALL DIAL INDICATED IN, PERFECT! NO MORE ISSUES AT ALL! CHECK THE BELL HOUSING TOO, MAKE SURE THAT TWO MOUNTING FACES ARE PARALLEL ON ALSO CHECK THE FLYWHEEL/ PILOT SHAFT NOSE BEARING/ BUSHING TO MAKE SURE YOU HAVE A GOOD SNUG FIT! I ASKED FEDERAL MOGUL THE BEARING MAKER WHY THEY DID NOT MAKE THE O.D.SNAP RING GROOVE TO ORIGINAL BRG PROPER DEPTH, THEY SAID, YOUR TOUGH LUCK. YOUR PROBLEM NOT OURS! I WAS PISSED. I LEARNED A LESSON. CHECK EVERYTHING!

Submitted by: Thomas Barth

 

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Thanks again folks. NCOA people are the best. I'm taking her to a Corvette specialist with all your feedback for them to review. Jeff Jeff Menkes on 2/18/2015 5:46:05 PM
I’d bet on the clutch linkage being maladjusted, keeping the throw-out bearing always putting pressure on the clutch fingers, so that the clutch is always slipping somewhat, but especially under power. Posted by Administrator on 2/18/2015 12:10:57 PM
Sounds like crank bushing left out Posted by Administrator on 2/18/2015 12:10:34 PM
I would dial indicate the flywheel first....when you machine it you take away material, when you do this, the flywheel does not dissipate the heat and causes slippage or vibration. I would try a U.S. Made flywheel, pressure plate, disc, and throw out bearing. Mike Siedlak Posted by Administrator on 2/18/2015 12:10:14 PM
Check the flywheel and make sure it is true or did they machine one of the weights off? They are externally balanced. Is it the right flywheel? Don't think it is the clutch. Was the pressure plate replaced? Check all the mounts are tight but my guess would be it is something that is spinning which is the pressure plate or flywheel. Tim O'Neill Posted by Administrator on 2/18/2015 12:08:57 PM
Try changing the flywheel or have it ground different. Gary Welcher on 2/18/2015 9:40:18 AM
I would get a difference transmission person to do the work. Sounds like the disk is being put in backwards. I did this as a teenager and it has always stuck in my head about what I did wrong. Yes it does make a terrible sound because the damper springs on the disc are hitting the flywheel when the clutch peddle is let out. Good luck with your problem. John Aleman on 2/10/2015 6:52:04 AM
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