CUMMINS 3937111 OEM FRONT CRANKSHAFT SEAL SERVICE KIT – 5.9L CUMMINS (1989–2007)

Cummins 3937111 kit, front crankshaft seal 5.9L, 12-valve Cummins, 24-valve Cummins, ISB 5.9, leak free crank seal, OEM Cummins seal, Dodge Ram 2500 3500 1989-2007

Restore factory-sealed reliability with the genuine Cummins 3937111 Front Crankshaft Seal Service Kit. Engineered by Cummins for the B-series 5.9L (1989-2007) engines, this OEM service kit addresses the common oil leak from the front cover/ crank nose area and ensures you maintain the integrity of your engine’s lubrication system.

Built to the same exacting standards as the original install, this kit includes the correct front crankshaft seal and installer/depth components for a proper, damage-free fit. Designed for direct replacement, it supersedes the older part numbers 3904353 and 3900709. 

Fitment & Application:
• Fits Dodge Ram 2500 and 3500 trucks equipped with the 5.9L Cummins B-series diesel engine from 1989 through 2007 (12-valve, VP44 24-valve, and 2003-07 common-rail versions). 
• Not intended for 6.7L (2007.5+), 6.7L ISB/ISX or other non-5.9L B-series engines—verify ESN/VIN before ordering. 

Why Choose Genuine Cummins?
• OEM-certified materials for long-term durability under diesel duty
• Includes installer/depth components to ensure correct seating and prevent re-work 
• Maintains factory fit and function to keep your engine leak-free and performing as originally designed. 

Fitment & Cross-Reference Links:
Cummins 3904353 Front Crankshaft Seal Service Kit
Cummins 3900709 Front Crankshaft Seal Service Kit

FAQ

Will this kit fit my 1989-2007 5.9L Dodge Cummins? Yes — this kit is the OE kit for 1989-2007 5.9L B-series (12-valve, VP44 24-valve & 2003-07 common-rail). Always verify by VIN/ESN. 

Does the kit include the installer/depth components? Yes — it includes the installer/depth ring to ensure correct seal seating and avoid damage during installation. 

What if my crank nose is grooved or damaged? If the crankshaft nose has a groove worn into the sealing surface, you should consider a wear-sleeve solution (for example Cummins part 3802820) instead of using only the seal.