Cummins Flywheel Housing (Casting 3937426) for B-Series 4BT/6BT 3.9L/5.9L - Used

Cast-iron flywheel / bell housing for Cummins B-series style diesel engines. Casting number 3937426 is legible on the housing web, along with foundry markings 1151015 / F / ZY. This housing family is commonly associated with Cummins 4B, 4BT, 4BTA 3.9L and 6B, 6BT, 6BTA 5.9L engines in marine, industrial, and vehicular service — application not verified, so it may fit those engines but the buyer must confirm. Condition: used take-off, blasted and painted, untested and unmeasured. Light surface rust around the cast numbers and on some machined edges; the casting appears complete in the photos, but no crack inspection or dimensional verification has been performed. Sold by photographs, identifiers, and dimensions only. Because Cummins can machine one raw casting into several different service part numbers, please verify the flywheel bore, SAE flange bore/bolt circle, and accessory pad layout against your engine before buying. Quote is subject to final fitment confirmation by engine/transmission serial number, part number, photos, and supplier availability. Buyer must confirm fitment by part number, photos, dimensions, engine model, serial number, and application before purchase. Used marine part sold as-is unless otherwise stated. No returns on electrical, used, special-order, or installed parts.