Clutch adjustment or bad pressure plate? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

chucks70 · 05-20-2009, 09:10 PM

I have a C30 with 4 speed granny and a 292. It sits for a couple of weeks in between drive times. This time I get in it and can't get into reverse or granny without grinding and its hard to get into first (not granny). I adjusted the clutch peddle so that the clutch engages about 1 1/2 inch off the floor, no difference. Then I adjusted so it engages when nearly all out, no difference. I have driven it about 45 miles in this condition and no difference now. When I start it with the clutch in either above adjusted positions the truck will seem to move forward (or backward in reverse) just a little. Any thoughts??

Thanks
Chuck

chucks70 · 05-21-2009, 06:59 AM

Anybody? TTT

68gmsee · 05-21-2009, 09:08 AM

You probably guessed right with the pressure plate. If you adjusted the clutch so that the pedal engages the throwout bearing 1-1/2 inches from the top and still won't disengage the clutch that generally indicates the pressure plate is either worn excessively or defective.

A worn clutch disc generally will manifest itself by slippage when you try to move the truck. Sometimes a bad pilot bushing may cause the transmission input shaft to continue to move making it difficult to shift.

Bottom line, it looks like it's time to look inside the bellhousing. If you have an inpection plate you can visually check from under there. But, I'd be leery of getting under that big truck unless I could lift the rear wheels to keep it from moving.

05-20-2009, 09:10 PM	#1
chucks70 Registered User Join Date: Feb 2002 Location: Cadiz, OH Posts: 628	Clutch adjustment or bad pressure plate? I have a C30 with 4 speed granny and a 292. It sits for a couple of weeks in between drive times. This time I get in it and can't get into reverse or granny without grinding and its hard to get into first (not granny). I adjusted the clutch peddle so that the clutch engages about 1 1/2 inch off the floor, no difference. Then I adjusted so it engages when nearly all out, no difference. I have driven it about 45 miles in this condition and no difference now. When I start it with the clutch in either above adjusted positions the truck will seem to move forward (or backward in reverse) just a little. Any thoughts?? Thanks Chuck __________________ 68 1 ton dually 292, 2001 Sebring, 2004 Trailblazer, 11 Camaro Convertible.

05-21-2009, 06:59 AM	#2
chucks70 Registered User Join Date: Feb 2002 Location: Cadiz, OH Posts: 628	Re: Clutch adjustment or bad pressure plate? Anybody? TTT __________________ 68 1 ton dually 292, 2001 Sebring, 2004 Trailblazer, 11 Camaro Convertible.

05-21-2009, 09:08 AM	#3
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Clutch adjustment or bad pressure plate? You probably guessed right with the pressure plate. If you adjusted the clutch so that the pedal engages the throwout bearing 1-1/2 inches from the top and still won't disengage the clutch that generally indicates the pressure plate is either worn excessively or defective. A worn clutch disc generally will manifest itself by slippage when you try to move the truck. Sometimes a bad pilot bushing may cause the transmission input shaft to continue to move making it difficult to shift. Bottom line, it looks like it's time to look inside the bellhousing. If you have an inpection plate you can visually check from under there. But, I'd be leery of getting under that big truck unless I could lift the rear wheels to keep it from moving.



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