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Old 03-13-2011, 08:07 PM   #9
swedishsteel
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Join Date: Jan 2011
Posts: 341
Default Re: Mystery flathead tapping noise, suggestions?

A worn piston pin bushing can make a light "knock" that you can't hear at higher rpms. When I rebuilt my '36 LB the machinist was supposed to put new pin bushings in the rods, well, he only did 7. Sounded like a rod bearing starting to go, but it never got any worse. Finally pulled the motor and found the cause. Good luck.
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