Re: Engine timing marks. - Saab 900 Bulletin Board - Saabnet.com
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Re: Engine timing marks.
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Posted by Landjet [Email] (#16) [Profile/Gallery] (more from Landjet) on Tue, 20 Sep 2022 21:20:23 Share Post by Email
In Reply to: Engine timing marks., David Cox, Tue, 20 Sep 2022 10:52:41
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There was no mention in the other posts about the line cast into the front cover that is the Zero mark of TDC -- this is "supposed" to relate to the plastic cover, but that is just a guess -- the plastic covers get distorted from gravel monkeys twisting it off and smashing it into place. I do trust the cast line on the front cover, so you need to take off the plastic cover and then you can see it better. Or, drill a big hole in the plastic cover to use the timing light when you are finishing the job......

Also, the cam timing can be affected by how much material is removed from the head during servicing. When you are checking TDC, as I think Simon S mentioned that true TDC is an average -- you have to come up on the stroke, there is is a dwell, then the piston goes down. In the middle of the dwell, is TDC. So, there is a possible offset between the leading and trailing edges of the TDC mark. That can affect the position of the marks on the camshaft.

I would first verify the harmony of the cast line on the aluminum front cover, and the "line" on the plastic clutch cover.

I bet Simon S is noting that you have the cam sprocket / chain a tooth off. Very possible it slipped off the appropriate tooth and the allowed migration of the camshafts. If you get one of them off, and then count the number of links between the sprockets, then both will be off a tooth.

Good luck!!!

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