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Cummins · Hardware & Fasteners
3931824CUM
In stock · ships from Knoxville
This is a genuine Cummins O-ring seal used to create a leak-proof connection in certain 5.9-liter B series diesel engines, particularly the Tier 3 automotive variants.
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Primarily listed for Tier 3 automotive 5.9L B engines. May fit other 5.9L B variants; always verify against engine serial number or original part illustration.
Part data verified against 4 catalog sources
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It prevents oil, coolant, or fuel leaks between mating engine components and helps maintain reliable engine operation. It's commonly replaced during engine overhauls, gasket set jobs, or when you notice seepage around the area it seals.
Part Number: 3931824CUM
SEAL O RING 3
Dealer: Knox Trailers
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