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1993 gmc c2500 clutch problem.



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Old 05-18-2010, 08:22 PM   #1
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1993 gmc c2500 clutch problem.

i just put a new clutch, flywheel, pressure plate, throwout, pilot, fork, pivot ball, slave and master cylinder in my 93 gmc 2500 2wd. it has the nv4500 and 350. my problem is the clutch stops disengaging when it is warm. i have noticed that the slave cylinder is spring loaded holding the throwout bearing against the pressure plate. is this normal? the clutch works great until it is warm. the pedal feels like something is locking up and not sliding. if it is in gear i can slip the clutch but it wont disengage all the way. i can let it cool down for a few minutes and it will work fine for a few minutes. it did this before and after i replaced the slave and master, so its not an air bleed issue. anyone have any suggestions? the throwout slides freely on the bearing retainer sleeve even when hot. could the pressure plate bind somehow not letting it move? thanks for ya'lls help. i'm stuck. transmission is back out of the truck, i don't see anything wrong.
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Old 05-19-2010, 12:58 PM   #2
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Doesn't sound right to have a spring holding the bearing against the press. plate. You are supposed to adjust it so when the pedal is out, the bearing shouldn't touch. It isn't supposed to spin all the time. It wouldn't be causing the problem you're having, but it ain't sounding right. Did you use all OEM parts? If your master cyl isn't moving enough fluid to fully accuate the slave, it won't be able to disengage. It is probably dragging when it's cold, but don't bite until it heats up a bit. It will eat up a clutch the way it is.
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Old 05-20-2010, 05:45 AM   #3
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both the old and the new slave did this. its all oem parts nothing special. nothing has an adjustment. the slave cylinder actually has a strap holding it closed when it came out of the box, just like on a strut. it is definetly spring loaded. it almost seems like it is supposed to hold it against the plate. and maybe something else is messing up. didn't have this problem till i changed the clutch though. i got the new fork and pivot today, i'm going to install them and see what happens tomorrow.
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Old 05-20-2010, 06:05 AM   #4
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Well, I'm stumped then. Hope you get 'er done.
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Old 05-20-2010, 03:28 PM   #5
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i hope you get it fixed . i just bought a truck that has the same problem . im thinking it is the fork on mine cause thats the only thing i havnt replaced .
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Old 05-20-2010, 09:56 PM   #6
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i hope i get it fixed too. i'll let you know what happens. the pivot socket in the clutch fork was broken and the fork was twisting a little bit. hope this solves everything. let me tell you, dont bother going anywhere but the dealer to get the pivot. i have been trying all week to get it from all the local parts places. they all said they could get it. they were all wrong.
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Old 05-22-2010, 07:57 AM   #7
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got it fixed last night. the pivot ball and the new fork fixed it. the old fork was bent back a little (i guess from 140k miles of use) and the nylon cushion and keeper were broken. the clutch is easier now than it has ever been.
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Old 05-23-2010, 07:22 AM   #8
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