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Old 03-29-2011, 8:29am   #3
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Sounds too metallic to be a spun rod, that would be a knock, possibly starting after a high pitched squealing sound. I would drain the oil first & see if there is shavings, strain the oil as it comes out of the pan through a pair of old nylons, pantyhose. If you see shavings there then it's vary likely a spun bearing but at this point I don't think so. I think I can hear the sound of a rocker clinking in there. What you may have is a bent valve, a compression test will tell.

UPDATE, I just listened to the clip again and I think I did pick up a squeal at the very end of it. The elevated temps and the lower pressure are not good signs so a bearing could very well be the problem
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