Re: Cam shaft bearings and cleaence - Saab 9000 Bulletin Board - Saabnet.com
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Re: Cam shaft bearings and cleaence
Posted by BobS (more from BobS) on Mon, 16 Aug 2010 12:31:26
In Reply to: Re: installing used head, cam shaft question, derf, Mon, 16 Aug 2010 08:55:18
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Seen those crappy looking cam bearing surfaces. Looks like they were not finished well after heat treat. On the 92 9000, the cam bearing clearance was something like .008" with 90K miles. Couldn't find a spec or anyone who could say what the clearance should be other than "that’s a lot". Decided it was OK since the valve springs and valve actuation loads are one way, towards the bearing cap. There isn't much cam bearing surface in the head to take a load, so a little clearance must not hurt.
Wondered if this clearance causes some of the valve noise these engines like to make.
posted by 71.38.2...
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