Description

This rear crankshaft seal is a precision-engineered sealing component designed for heavy-duty diesel engines requiring OEM part numbers 3353978 and 3804900 . The rear crankshaft seal prevents engine oil from leaking at the rear of the crankshaft, protecting the flywheel housing, clutch assembly, and transmission components from oil contamination. Manufactured from high-performance, oil- and heat-resistant sealing materials , this seal is built to endure continuous crankshaft rotation, extreme operating temperatures, and high-pressure diesel environments. Proper rear crankshaft sealing is essential for maintaining oil pressure, preventing drivetrain contamination, and avoiding costly transmission-related repairs. This single-piece rear crankshaft seal is ideal for lower gasket set service, engine rebuilds, rear main seal replacement, and preventative maintenance . Precision-molded to OEM specifications, it ensures exact fitment and long-lasting leak protection. Key Benefits: OEM replacement for 3353978 / 3804900 Prevents rear crankshaft oil leaks Protects flywheel, clutch, and transmission components Oil- and heat-resistant construction Maintains proper engine oil pressure Suitable for heavy-duty diesel engine rebuilds