Re: BAFFLING CLUTCH PROBLEM - Saab Vintage Models Bulletin Board - Saabnet.com
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Re: BAFFLING CLUTCH PROBLEM
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Posted by kansas (more from kansas) on Sat, 5 Aug 2006 20:08:00 Share Post by Email
In Reply to: Re: BAFFLING CLUTCH PROBLEM, Drew Rogers, Sat, 5 Aug 2006 15:17:04
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The pressure plate is over 1/4" away from the flywheel when the bolts first need a wrench to turn them. It does tighten all the way down like it should. The clutch disk only goes in one way from what I have seen. The disk is flat on one side with another small raised metal section in the middle of the other side. This part with the raised section I put towards the pressure plate and incidentally the transmission.

When the pressure plate is torqued at 15 lbs to the flywheel, the surface that the throwout bearing should contact (the part that sits over the 3 levers that actuate the clutch) does not stick out. Instead it is flush with the rest of the surface of the pressure plate. I was thinking that this should stick out a little ways and when you push on the pedal it would go in about that far.

When I shimmed the slave cylinder, I put washers between the back of the cylinder and the tab on the transmission it rests against, the part where the bolt goes through. This pushed it further and further towards the engine. I shimmed it almost an inch before it began to release the clutch. This was the point where you could hear the fork start to hit the pressure plate.

How can you tell if the clutch fork is bent? It looks ok.

Best way would be to compare it with a known good unit. Beyond that look for obvious distortion, cracks in the metal, misalignment of the top and bottom arms that extend laterally from the shaft, or of the slots which engage the TOB.

The top hole that the throwout bearig sits in is a little bit sloppy but it is equal all the way around, not elongated. It is perhaps a 32nd of an inch to large on all sides. The other thing that baffles me is that the clutch was working before I pulled the engine.

This cause me problems also. Something about the way you have reassembled this is different from the original configuration. I am not saying you have done it wrong; you may have wrong or defective parts or other undetected wear.

The only thing that was done beside the new clutch part was to suface the flywheel. I checked the step hight of the flywheel and it was just a hair over 16mm.

AHA!!!!!!!!!!! 16MM - 0.629921". Correct height is 0.656" + or - .005", ie minimum correct height is 0.656 - 0.005 = 0.651".

0.651 - 0.629 = 0.022".

Your step height is not right if you have measured accurately, and may contribute to the problem. However, the difference in your step height from spec does not for me account for your problem. Even with that discrepancy in step height the clutch should still operate with a new disc and a new pressure plate. More information required to solve this over the internet.





I can post photos if that would help. How do I post them here if I don't have a site to post them on?
Thanks, Drew

I cannot advise you on that.

posted by 208.53.8...


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