Rear Main Seal Set Dodge Cummins 5.9L

The Rear Main Seal Set Dodge Cummins 5.9L is a critical engine component engineered to prevent oil leakage at the crankshaft's aft position in Dodge diesel engines. This single-piece rubber seal assembly is purpose-built for heavy-duty diesel applications where reliability and durability directly impact engine longevity and performance. Owners of Dodge Cummins-equipped trucks—whether for work, towing, or daily driving—depend on OEM-quality seals to maintain proper oil containment and prevent costly engine damage.

Manufactured by MAHLE ORIGINAL/CLEVITE under part number JV1690, this rear main seal set utilizes premium rubber formulation designed to withstand the extreme heat, pressure, and rotational forces inherent to diesel combustion. The 1-piece design simplifies installation compared to split-ring alternatives, reducing labor time and potential assembly error during engine rebuilds or routine maintenance. The seal's engineering prevents blow-by and oil weeping at idle and under full-load operation, maintaining proper crankcase pressure and extending overall engine service life.

This seal kit is essential for anyone performing engine overhaul, crankshaft removal, or transmission work on 5.9L Dodge Cummins engines. Proper installation requires careful attention to seal seating depth and orientation to ensure oil containment and prevent leaks that could lead to low oil pressure and catastrophic engine wear. Mechanics and rebuilders trust MAHLE ORIGINAL quality for first-run reliability and minimal comebacks, making this the preferred choice for professional-grade diesel engine service.