Reply To: 1959 Sportwin Powerhead noise

[Don]

Hmmm…Seems like you have checked for sloppy wrist pins and ruled that out. Could be a damaged upper or lower crank bearing, but perhaps the gearcase is making a racket, sometimes those noises travel upward…Have you drained and inspected the gear lube? You could try removing the gearcase, then putting the engine back in a barrel and starting it to see if it still makes the noise…