ImLewie 1 #1 Posted May 4, 2023 needed a crankshaft for my 520H with Onan P220G Purchased one off Ebay said was for a Onan P220G. Castling numbers on the one from Ebay were 3353. Casting number on the one I'm replacing is 3336. Will they interchange? 1 Share this post Link to post Share on other sites
953 nut 55,279 #3 Posted May 4, 2023 It sounds like you have already purchased the replacement crankshaft, put them side by side and measure the two of them looking for any discrepancies. I'm not an Onan man so I can't say with certainty that these two crankshafts are going to be identical. What I can tell you is that any industrial foundry that is casting large quantities of parts (like crankshafts) will give each mold a number even though they are producing the same identical item. This is done to track the quality of each mold's products. If the flywheel end and the PTO end measure the same then it is probably going to be a direct replacement. 2 1 Share this post Link to post Share on other sites
