Cummins 3904353 Rear Crankshaft Oil Seal for 6B / 6BT / 6BTA 5.9L - Used

Application: Cummins B-series 6B / 6BT / 6BTA 5.9L rear crankshaft oil seal, OEM markings including 'SHAFT ROTATION', 'INSTALL DRY', and part number 3904353 stamped on the case OD. Condition: Used take-off with light surface rust on the metal case and shop soil; rubber lip appears intact in photos but sealing surface wear cannot be verified — best used as a reference/pattern or core. 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.