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Jim Brierley · 10-14-2020, 10:50 AM

It's probably loose main bearings as Syncro909 says. I had an engine that did that, and leaked out the rear main like you wouldn't believe. It may be time for a complete rebuild.

10-14-2020, 10:50 AM	#7
Jim Brierley Senior Member Join Date: Jun 2010 Location: Temecula, CA Posts: 4,088	Re: Knocking on start up It's probably loose main bearings as Syncro909 says. I had an engine that did that, and leaked out the rear main like you wouldn't believe. It may be time for a complete rebuild.