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40 Deluxe · 10-13-2020, 07:44 PM

Drop the pan and check for a worn rod or main bearing. They knock worse on start up until they get oil. Sometimes a worn/cracked piston will rattle for awhile until it warms up a little and expands.

10-13-2020, 07:44 PM	#2
40 Deluxe Senior Member Join Date: May 2010 Location: now Kuna, Idaho Posts: 3,778	Re: Knocking on start up Drop the pan and check for a worn rod or main bearing. They knock worse on start up until they get oil. Sometimes a worn/cracked piston will rattle for awhile until it warms up a little and expands.