Clutch fork Problems- and part # questions
#1
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Clutch fork Problems- and part # questions
Working on a friends 86 turbo- i put a clutch in this last summer after the clutch fork broke. Replaced clutch fork w/ brand new fork and clutch kit from Paragon. Now NEW clutch fork is broken. Clutch is just a cup clutch w/ 930 disc. We noticed when we pulled it out that the new fork says 931 116 835 1R on it- paragon lists two different part #'s for turbo and n/a - the n/a starts w/ 931 but is like 931 116 085 or something. Any difference between n/a and turbo forks and did i get the wrong one somehow - i know we paid for the turbo version. Im calling them in the morning but thought i would see if anyone knew. Is there a size difference in the TO bearing? Wondering if we have an n/a TO bearing or something, looks like the inside of the fork arms are unusually worn like they were wider than the TO bearing or something...
#2
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you're scaring me... my first replacement clutch fork broke... just put in a new one... Let me check PET real quick for ya.
edit:
Per PET, for 1988 and 1986,
931 116 085 00 is for a 944
951 116 085 00 is for a turbo.
for Throwout Bearings,
931 116 082 04 is for a 944
951 116 082 01 is for a turbo.
IIRC, the throwout bearing is MUCH beefier on the turbo, when I did a clutch job on my 924, I know they sent me a turbo one by accident. Looks to me like you got the wrong fork.
That forking sucks...
edit:
Per PET, for 1988 and 1986,
931 116 085 00 is for a 944
951 116 085 00 is for a turbo.
for Throwout Bearings,
931 116 082 04 is for a 944
951 116 082 01 is for a turbo.
IIRC, the throwout bearing is MUCH beefier on the turbo, when I did a clutch job on my 924, I know they sent me a turbo one by accident. Looks to me like you got the wrong fork.
That forking sucks...
#3
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Borat Impersonator
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I just went through this with a friend of mine.
the turbo fork arms are 2-3 mm wider apart than the NA fork (bigger bearing)
the NA fork is not as rounded and is slightly bigger.
both of his original fork and the replacement turbo fork had 931xxxx part nos stamped on them
here is a comparison shot, turbo fork on top NA fork is on the bottom
yours looks like a turbo fork
the turbo fork arms are 2-3 mm wider apart than the NA fork (bigger bearing)
the NA fork is not as rounded and is slightly bigger.
both of his original fork and the replacement turbo fork had 931xxxx part nos stamped on them
here is a comparison shot, turbo fork on top NA fork is on the bottom
yours looks like a turbo fork
#4
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My car is the fork eater in question...
I gather that the turbo and n/a both use the same casting (with 931 etc. # on it), but the 951 fork may be ground down to clear more space for the larger throw out bearing. I think it's starting to look like we may have used an NA TOB.
I gather that the turbo and n/a both use the same casting (with 931 etc. # on it), but the 951 fork may be ground down to clear more space for the larger throw out bearing. I think it's starting to look like we may have used an NA TOB.
#6
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Alan
This sucks for you... hope that all else is okay with the car. You going to solve the intermittent starting issue at the same time?
Knowing Dan, I bet this happenened yesterday at 8PM and by 12:30 AM it was all apart
This sucks for you... hope that all else is okay with the car. You going to solve the intermittent starting issue at the same time?
Knowing Dan, I bet this happenened yesterday at 8PM and by 12:30 AM it was all apart
#7
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Yes sir, I am. How's your car doing since I drove it, btw?
You're close. We started tearing into it at about 7:30 pm and we had it all apart before 11 pm. Dan is the man.
EDIT: forgot to mention, we took about a 45 min break for dinner and some lemons recap, too.
EDIT: forgot to mention, we took about a 45 min break for dinner and some lemons recap, too.
Last edited by vt951; 10-10-2009 at 11:30 AM.
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#10
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You know there has been enough of these broken forks over the last few years to make me wonder if getting a collective group buy together and having someone make something superior out of billet or whatever?
#11
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Sorry to hear, Alan.
Good idea Patrick. Alternatively, is there a way to stress relieve what we can currently get? Maybe a cryogenic treatment, or something?
Good idea Patrick. Alternatively, is there a way to stress relieve what we can currently get? Maybe a cryogenic treatment, or something?
#12
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Some people swear by cryo treating, but I have no idea if it really works or not Van. Many parts on our cars were over-engineered for the day, but I don't think it was envisaged how much extra force and load these cars would be put under many years later. Maybe we do just need an improved design / construction?
#13
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#14
Cryo treating finishes heat treating and then only on some metals.
I am sending my fork to Blazack. When I talked to him, he said one of the things he does is heat treta it. This makes sense to me as it is probably case hardened and makes them last longer.
-Dana
I am sending my fork to Blazack. When I talked to him, he said one of the things he does is heat treta it. This makes sense to me as it is probably case hardened and makes them last longer.
-Dana