The 1947 - Present Chevrolet & GMC Truck Message Board Network

Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > General Truck Forums > Engine & Drivetrain


Thread Tools Display Modes
Old 05-16-2017, 11:40 PM   #1
Restoring it $200 at a time...
hounddogs!'s Avatar
Join Date: Aug 2008
Location: NE Kansas
Posts: 840
Clutch will be replaced, what actually failed?

It was bound to happen sometime. I've had this truck for going on 25 years and have never touched the clutch. Over the last few weeks, the pedal had gotten to where it didn't want to return. A good stab would normally bring it back up. Now it's gotten to where the pedal won't return unless you put your toe under it and let it snap back. The actual engagement still feels OK, just the pedal operation.

Did the throwout bearing finally fail? I would think that if the clutch fingers were weak, I'd feel slippage. The pedal and z-bar springslook OK.

Any thoughts?
Charter member of the 'Put the dimmer switch back on the damn floor where it belongs' Society

'68 327-4 speed LWB C20; grandpa bought it for the farm in '71.

DD '01 Grand Cherokee Valdez

Weekender '65 Skylark 300-4V-4 speed

Wife's '07 Lexus ES350; 117 actuator motors and I can't see the engine.
hounddogs! is offline   Reply With Quote
Old 05-17-2017, 12:38 AM   #2
Senior Member
Join Date: Mar 2016
Location: Long Island NY
Posts: 402
Re: Clutch will be replaced, what actually failed?

If the throwout bearing failed that would mean it would no longer spin on the clutch finger side. So when the clutch side contacted the fingers on the pressure plate there would be metal on metal grinding. A more likely throwout bearing issue that could explain your issue is the throwout bearing not sliding easily. I forget what the surface the throwout bearing rides on is called but that could be gummed up, rusty and no longer smooth for the throwout bearing to slide on. Since you say engagement is fine I'd say this is the most likely issue.

But I wouldn't totally rule out a problem with the pressure plate either.
Overdriven is offline   Reply With Quote
Old 05-17-2017, 06:13 AM   #3
Registered User
Join Date: Oct 2013
Location: Maine
Posts: 1,539
Re: Clutch will be replaced, what actually failed?

You would think the spring would be enough to pull it back. Maybe it needs grease in the Z bar.
76 Chevy K20
76 GMC K15
77 Chevy C10
cadillac_al is offline   Reply With Quote
Old 05-17-2017, 08:24 AM   #4
Active Member
68gmsee's Avatar
Join Date: Jul 2007
Location: Centrally located between Houston, Austin and Waco. BCS area.
Posts: 7,823
Re: Clutch will be replaced, what actually failed?

First, try to disengage the clutch linkage from the fork and manually move the pedal up and down. If it moves freely than the most likely problem is the input shaft bearing retainer needs lubricating or has wear grooves.

If you have to remove the transmission, may as well go all the way and replace worn or old parts like clutch disc, pressure plate and throwout bearing.
68 GMC 250/3 speed Saginaw p/b p/s
69 Chevy 350/350 currently in pieces still lookin for a cab
06 Trailblazer
I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...
68gmsee is online now   Reply With Quote
Old 05-17-2017, 02:21 PM   #5
Registered User
Join Date: Dec 2009
Location: bisbee, arizona
Posts: 1,358
Re: Clutch will be replaced, what actually failed?

week return spring on the linkage.grease the movable joints.

I had a truck that sat for a long time and the clutch disc stuck to the flyywheel. Got stiff after that untill it was replaced
mike16 is offline   Reply With Quote


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

All times are GMT -4. The time now is 01:41 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2018, vBulletin Solutions Inc.
Copyright 1997-2013