Cam timing is off --- valve damage? - Saab 9000 Bulletin Board - Saabnet.com
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Cam timing is off --- valve damage?
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Posted by Bryan [Email] (#542) [Profile/Gallery] (more from Bryan) on Mon, 24 Nov 2003 10:31:43 Share Post by Email
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I have a '94 9000 turbo that I bought with a blown head gasket. This is my first Saab, but not my first head gasket. Can't be that tough, right? This is the part where I admit to being a moron....
I had trouble finding any reference material that indicated how to line up the camshafts (manual at the library had no pics), so I decided that the notch on each of the cam sprockets was the timing mark. Other twin cam cars I've worked on generally have a dot or notch on the two cams sprockets that are lined up facing each other.
Anyway, this put my cams off by 90 degrees. I was unaware, and tried to start the car. Now that I've realized my mistake, the cams are lined up where they're supposed to be but my compression is funny. My first thought is that I bent a bunch of valves, but my compression readings are not similar in all 4 cylinders (130,90,60,30). If the cams were off, causing valve damage, wouldn't it have damaged valves in all 4 cylinders similarly? Shouldn't my readings be much closer? The intake cam was off 90 degrees clockwise, and the exhaust cam was off 90 degrees counter-clockwise. Is this enough movement in the right direction to cause damage? If so, why only in certain cylinders? They should all be affected the same I would think.
Any help appreciated.
Thanks
Bryan

posted by 199.250.5...

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