Cummins 3933384 Rear Crankshaft Oil Seal Housing for 6C 8.3L - Used

Cummins rear crankshaft oil seal housing (rear main seal retainer) in cast aluminum. **Application:** tagged for the Cummins 6C / 8.3L engine family (6CT / 6CTA / C8.3, industrial and marine variants); the casting is marked 3921042 with 3933384 noted on the tag as the newer Cummins number — application not verified by engine serial number. **Condition:** used take-off, untested. Casting is complete with all bolt holes intact; light surface oxidation and normal seal-bore witness marks. Crankshaft seal, gasket, and hardware are not included. 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.