Cummins 3642365 Rear Crankshaft Oil Seal

The Cummins 3642365 is a rear crankshaft oil seal designed for flywheel housing applications on heavy-duty Cummins K-series and QSK-series diesel engines. It functions as a critical barrier preventing engine oil leakage between the rotating crankshaft and stationary flywheel housing. The seal features CCW (counter-clockwise) rotation orientation and is constructed from high-temperature resistant elastomer materials suitable for continuous operation in demanding industrial, marine, and power generation environments. This component is frequently included in major overhaul kits for Cummins KTA38, KTA50, QSK38, QSK50, VTA 1710, K19, K38, K50, GTA38, M11, QSK60, V28, and VTA engine platforms. It supersedes earlier part numbers including 3630681, 3003878, 3016790, 3016793, and 3082142. The seal interfaces directly with the crankshaft rear flange and flywheel housing bore, maintaining lubrication system integrity under high crankcase pressure conditions.