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Old 08-22-2019, 09:06 AM   #7
Bob Bidonde
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Join Date: May 2010
Location: Long Island, NY
Posts: 1,475
Default Re: wierd noise in engine

A center main bearing issue make itself known 100% of the time the engine is running. The timing gear may be erratic. Check the easy thing first, the timing gear!

Test the timing gear by pressing the timing pin against the gear while the engine is running. Be careful of the fan! If the timing gear is loose, pressing on it should make the knocking noise go away.

Take the side timing gear cover off of the engine to check the teeth on the timing gear. Have someone hand crank the engine for this step.
Bob Bidonde
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