4+3 Clutch Issue
Thread Starter
Burning Brakes
Joined: Nov 2003
Posts: 1,234
Likes: 5
From: Herriman UT
4+3 Clutch Issue
After some spirited shifting on a couple 1/4 mile runs, my 86 4+3 clutch is now acting peculiar. When depressing the clutch pedal, it hangs up about 1/2 way, and is very difficult to depress the last 1/2. Advice?
Thread Starter
Burning Brakes
Joined: Nov 2003
Posts: 1,234
Likes: 5
From: Herriman UT
Nothing in the FSM regarding this symptom. I guess I'll start at the pedal and work toward the clutch to find the source of the binding. Hopefully I'll find it before I reach the clutch.
Pro
Joined: Sep 2006
Posts: 702
Likes: 2
From: Conyers Ga
If it was brand spanking new? Probably not. If it's been on the car for a while? Yes. It could also be the clutch fork. You could try removing the rubber boot that covers the slave cylinder rod, remove the rod and try the clutch pedal then. (have someone under the car to push the piston back into the slave) If it feels right then you probably have a clutch, clutchfork issue more then likely.
7th Gear
Joined: Feb 2008
Posts: 7
Likes: 0
From: Tustin CA
I had a similar problem. Went out to drive the car one morning and couldn't get the clutch to release. You could push the pedal down and it would stop about half way. Not a solid stop but it felt like it had air in the system. Had a friend push on the clutch pedal while I looked at the slave cylinder and saw no movement at all on the clutch fork. Had him push real hard and watched as the rubber section of the line would swell and try to twist itself into a spring. A new line assembly fixed it for me. Cutting open the bad line showed the whole rubber section was deteriorated internally and had totally collapsed next to the crimp connection on the slave end of the line.
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Thread Starter
Burning Brakes
Joined: Nov 2003
Posts: 1,234
Likes: 5
From: Herriman UT
It looks like the problem is at the clutch pedal / master cylinder push rod. The push rod has slipped to the very end of the shaft where it connects to the clutch pedal, causing it to enter the master cyl at an angle when the pedal is depressed. I believe this may have occured due to the side to side "slop" in my clutch pedal.
Can the bushings at the pedal pivot bolt be replaced, or is the side to side movement normal? Are the parts available? Is the only access to perform this work from under the dash? That's going to be way tough... What type of clip holds the MC push rod onto the pedal?
Any help / tips would be appreciated.
Can the bushings at the pedal pivot bolt be replaced, or is the side to side movement normal? Are the parts available? Is the only access to perform this work from under the dash? That's going to be way tough... What type of clip holds the MC push rod onto the pedal?
Any help / tips would be appreciated.
Instructor
Joined: May 2001
Posts: 136
Likes: 0
From: Raleigh NC
I just went through this exercise on a 'project vette' I bought where the last person couldn't get the clutch working (story for another time). This problem was about 1 of 4 I had to fix.
The clip had fallen off the pin for the master cylinder rod who knows how many miles/years ago and the pin was a basket case, worn more than half way through.
I was told that you can just buy the 'pin' from GM. I didn't know that at the time and fabricated up one out of a grade 5 bolt and a little welding.
I'll try to post a picture later (they are pending approval).
http://forums.corvetteforum.com/phot.../IMG_0663a.jpg
http://forums.corvetteforum.com/phot.../1064/671a.jpg
The clip had fallen off the pin for the master cylinder rod who knows how many miles/years ago and the pin was a basket case, worn more than half way through.
I was told that you can just buy the 'pin' from GM. I didn't know that at the time and fabricated up one out of a grade 5 bolt and a little welding.
I'll try to post a picture later (they are pending approval).
http://forums.corvetteforum.com/phot.../IMG_0663a.jpg
http://forums.corvetteforum.com/phot.../1064/671a.jpg
Last edited by DaveD; Apr 24, 2008 at 12:28 PM. Reason: added picture links
Safety Car
Joined: Jan 2006
Posts: 3,566
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From: Mt Laurel NJ
St. Jude Donor '06-'07
Randy
