CUMMINS 3915787 OEM THREADED PLUG – OIL FILTER HOUSING / OIL PRESSURE RELIEF – 5.9L (1994–2002)

Product Description

The Cummins 3915787 OEM Threaded Plug is a genuine oil galley / oil pressure relief plug used in the oil filter housing assembly on select 1994–2002 5.9L Cummins B-Series engines. This plug is critical for sealing internal lubrication passages and maintaining correct oil pressure regulation. Using a genuine Cummins plug ensures proper thread engagement, leak-free sealing, and long-term durability compared to aftermarket alternatives.

Whether servicing a leaking filter housing, rebuilding an engine, or replacing missing/damaged hardware, the 3915787 threaded plug restores OEM reliability and correct lubrication system function.

Fitment

• 1994–1998 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins
• 1998.5–2002 Dodge Ram 2500/3500 with 5.9L 24-Valve ISB Cummins
• 5.9L B-Series engines using OEM filter housing with threaded pressure-relief plug location

Note: For industrial/off-highway B-Series engines, ESN verification is recommended.

Cross-Reference (Cummins-Only)

Related lubrication-system Cummins components:
• Cummins 3900625 OEM Hex Flange Head Cap Screw
• Cummins 3903924 OEM Timing Pin – 12-Valve
• Cummins 3900267 OEM Tappet Cover Bolt Grommet Seal

FAQ

What does the Cummins 3915787 threaded plug do?

This plug seals an internal oil galley or oil pressure relief passage inside the oil filter housing on 5.9L Cummins engines.

Is this plug a common source of oil leaks?

Yes. Over time, damaged threads or improper sealing can cause leaks. Replacing with a genuine Cummins part fixes the issue.

Does this fit both 12V and 24V 5.9L engines?

Yes — it fits 1994–2002 5.9L 12-Valve and 24-Valve ISB Cummins when equipped with OEM oil filter housings using this threaded plug.

Does this plug require sealant?

Cummins typically specifies sealant on certain oil galley plugs. Follow service manual instructions for your exact ESN.

Specifications for cummins 3915787