CUMMINS 3930906 OEM VALVE COVER GASKET – 5.9L 12V (1989–1998) | 4BT/6BT B-SERIES

Product Description

The CUMMINS 3930906 OEM VALVE COVER GASKET is the factory-correct seal for the 5.9L 12-valve Cummins as well as the 4BT and 6BT B-Series engine family. Designed by Cummins for a perfect fit, this genuine gasket ensures a reliable, leak-free seal that holds up to vibration, heat cycles, and long-term diesel use.

If you are rebuilding your 12-valve, replacing valve cover hardware, or simply addressing an oil seep, this OEM gasket restores factory sealing performance with no guesswork. No aftermarket squish, no premature leaks — just true Cummins-engineered reliability.

FITMENT

• 1989–1998 Dodge Ram 2500/3500 with 5.9L 12V Cummins
• Cummins 4BT (3.9L) B-Series engines
• Cummins 6BT (5.9L) industrial/ag applications
• Replaces gasket for all OEM 12-valve stamped and cast valve covers

CROSS-REFERENCE / RELATED CUMMINS PARTS

• CUMMINS 3930904 OEM VALVE COVER STUD SEAL – 5.9L 12V
• CUMMINS 3930905 OEM VALVE COVER GROMMET – 5.9L 12V
• CUMMINS 3911580 OEM VALVE COVER – 5.9L 12V

FAQ

Does this gasket fit all 1989–1998 12V Cummins engines?
Yes. This is the correct OEM valve cover gasket for every 12-valve 5.9L Cummins used from 1989–1998.

Is this gasket compatible with 4BT and 6BT engines?
Yes — the 3930906 gasket fits most 4BT and 6BT B-Series valve covers used in industrial, agricultural, and swap applications.

Should this gasket be replaced whenever the valve cover is removed?
While reusable in some cases, Cummins recommends replacement if the gasket shows compression fatigue, hardening, or oil seepage.

Is this a genuine Cummins part?
Yes — 3930906 is an authentic Cummins-manufactured OEM replacement gasket.

Will this fix oil leaking around the valve cover?
If the leak originates at the valve cover sealing surface, this OEM gasket will restore proper sealing. Ensure the cover itself isn’t warped.