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Railcarmover · 07-06-2018, 11:59 PM

Same issue on an engine Im building for a friend,Thumps for the first few minutes then quiets right down..rods and mains good,cam thrust spring good..spring missing from oil pump,found the oil pump 'set screwed' at the plug.Best I can figure the cam endplayed hard when the pump was dry,something the spring was designed to absorb..

07-06-2018, 11:59 PM	#3
Railcarmover BANNED Join Date: Apr 2017 Location: Sacramento Posts: 1,262	Re: Knocking Sound Comes, Then Goes Same issue on an engine Im building for a friend,Thumps for the first few minutes then quiets right down..rods and mains good,cam thrust spring good..spring missing from oil pump,found the oil pump 'set screwed' at the plug.Best I can figure the cam endplayed hard when the pump was dry,something the spring was designed to absorb..