clutch fork hyper-extending
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,474
Likes: 44
From: Auburn MA
clutch fork hyper-extending
I posted this video this summer of my 94 6-speed coupe making a god awful grinding sound only when the clutch pedal is pressed all the way to the floor. Everyone said it was the clutch fork was hyper-extending and rubbing against the pressure plate... I was so frustrated I just parked it. Well I want to fix this problem now that its winter and I can take my time with it. Does anyone have a write-up on how to get this tranny out and fix it. Any info would be awesome.
Thread Starter
Melting Slicks
Joined: Feb 2005
Posts: 3,474
Likes: 44
From: Auburn MA
It's force of habit to mash it to the floor especially if I have to panic stop.... Plus I read it will get worse and possibly damage other things.... That's why I put it in hybernation early.
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
If the ball stud works its way out, that can make the fork rub, because the fork is closer to the PP
The stock hydraulics are a fixed stroke, you can't force the fork farther than the stroke of the slave, so something is bent or backed out etc.
Running issues;
1. FW too thick.
2. Ball Stud backed out
3. Bent Fork
4. I guess, a bad TOB
This always reminds me of how much I loooovvvve my TKO600,, Happy Valentines Day TKO, my sweet!!!
The stock hydraulics are a fixed stroke, you can't force the fork farther than the stroke of the slave, so something is bent or backed out etc.
Running issues;
1. FW too thick.
2. Ball Stud backed out
3. Bent Fork
4. I guess, a bad TOB
This always reminds me of how much I loooovvvve my TKO600,, Happy Valentines Day TKO, my sweet!!!
Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
http://forums.corvetteforum.com/c4-t...post1578535204
You know, if you hold he fork down long enough, the noise will go away
You know, if you hold he fork down long enough, the noise will go away
Le Mans Master
Joined: Aug 2010
Posts: 9,272
Likes: 17
http://forums.corvetteforum.com/c4-t...post1578535204
You know, if you hold he fork down long enough, the noise will go away
You know, if you hold he fork down long enough, the noise will go away
this shows a fully functional 'drive it like you stole it ' attitude,.....totally excellent
Intermediate
Joined: Nov 2011
Posts: 35
Likes: 0
I have a problem the opposite from yours. I push my clutch all the way in and it doesn't release quite all the way. Put in new clutch,pressure plate, throw out bearing, master cylinder, slave cylinder, new line and have bled the thing till blue in the face still the same thing. Forgot to mention a new engine and yes checked the endplay of the crank. Good luck on yours a least you can drive it. About ready to dig a hole for mine.
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Race Director
Joined: Feb 1999
Posts: 12,772
Likes: 17
From: Indianapolis IN
I have a problem the opposite from yours. I push my clutch all the way in and it doesn't release quite all the way. Put in new clutch,pressure plate, throw out bearing, master cylinder, slave cylinder, new line and have bled the thing till blue in the face still the same thing. Forgot to mention a new engine and yes checked the endplay of the crank. Good luck on yours a least you can drive it. About ready to dig a hole for mine.
if it does not, then the hydraulics are good, and you have a geometry problem i.e. stack ups etc
I dont want to make it sound simple, sounds like you've tried everything already
Race Director
Joined: May 2001
Posts: 14,165
Likes: 9
The pivot ball is loose. It screws into the bellhousing and it has a locking screw / bolt that screws into it from the back side. I had this problem and when I removed the transmission the locking screw just fell out on the ground.
I found that fortunately the fork was tougher than the pressure plate and so the fork wasn't damaged (I had bought a new clutch to put in it anyway). I cleaned the metal shavings out of the bellhousing and threaded the ball stud back fully in place. I then put the locking screw back in place with locktite this time and put it all back together. I haven't had any trouble in years.
It's a very easy fix that's a real pain just because you've gotta get the trans out of the way. Might as well toss a new clutch in while you're at it, it's only a handful of bolts away by the time you get to the pivot ball.
I found that fortunately the fork was tougher than the pressure plate and so the fork wasn't damaged (I had bought a new clutch to put in it anyway). I cleaned the metal shavings out of the bellhousing and threaded the ball stud back fully in place. I then put the locking screw back in place with locktite this time and put it all back together. I haven't had any trouble in years.
It's a very easy fix that's a real pain just because you've gotta get the trans out of the way. Might as well toss a new clutch in while you're at it, it's only a handful of bolts away by the time you get to the pivot ball.
