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Old 01-26-2012, 08:05 PM   #1
Gregsenne
Registered User
 
Join Date: Sep 2010
Location: southwest ohio
Posts: 82
Clutch pedal won't return

Hi everyone
I am in the process of building a 1986 GMC Sierra. The engine is a 1989 350. The truck used to be an automatic, but i'm converting it to a manual. Transmission is a Muncie SM465 from a 1979 1 ton. The clutch pedal is all manual linkage. I know the 86 trucks might have come with the hydraulic setup, but I don't have the money for it, and have all the manual linkage stuff.

I have the clutch fork pushrod extended all the way out, and the pedal grabs at about halfway through. Then, it doesn't retract the rest of the way. It's like the pedal stops when the pressure plate springs are all the way out, and the pedal doesn't come the rest of the way up. From halfway through to all the way to the floor, it feels like it should, and retracts properly.

I have a small spring between the clutch fork and the Z bar. I also have a long spring between the bottom of the clutch fork and the frame, just ahead of the shock mount. Both springs have tension on them.

The Z bar mounts in a ball screwed into the side of the bellhousing, and the other side I had a bracket made by a friend at a machine shop that I bolted the other ball into (because I didn't have the factory bracket).

There is a heavy spring on the pedal itself, that goes from the pedal arm to the pedal bracket. Honestly, I couldn't see how it would work, because it never seemed to pull the clutch back up. Maybe I have that installed wrong? Before I had the linkage hooked up (with the heavy spring on the pedal), the clutch would stay all the way up, but if you pressed it 1/4 way down, it would spring down to the floorboard.


Thanks for any help. I have included a few pictures the best I could.

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