Product Description
Interstate-McBee M-3906698 Water Pump O-Ring Seal — 1989–2018 5.9L/6.7L Cummins
OEM-style water pump mounting seal ring (O-ring) engineered by Interstate-McBee for Cummins B-Series 5.9L & 6.7L applications. Designed to seal between the water pump and the engine block for a leak-free install whenever the pump is serviced or replaced.
- Direct-fit, OEM-equivalent: Interchanges with Cummins 3906698.
- Purpose-built sealing: Rectangular ring profile for stable compression and long service life.
- Aftermarket value: Interstate-McBee quality at a lower cost than OEM-boxed parts.
Specifications
| Interstate-McBee PN | M-3906698 |
|---|---|
| OEM Cross-Ref | Cummins 3906698 |
| Function | Water pump mounting seal (between pump & block) |
| Engine Family | Cummins B / ISB / QSB (5.9L & 6.7L) |
Vehicle Fitment
Always verify by engine serial number (ESN) for best accuracy.
- Dodge/Ram with 5.9L or 6.7L Cummins (1989–2018) — commonly used on 2500/3500, and many 4500/5500 (2008–2018).
Install Notes
- Clean mating surfaces on pump and block thoroughly; remove old seal material.
- Lubricate the O-ring lightly before install and align carefully to avoid pinching.
- Replace the seal any time the water pump is removed.
Warranty
New Interstate-McBee engine parts are covered by a manufacturer warranty (commonly up to 24 months from installation for new engine parts). See official policy or contact us for details.
Why Buy From CPP Diesel
- Diesel-specific fitment support for Cummins B-Series platforms
- Fast shipping and easy returns
- Knowledgeable techs who can check ESN-level compatibility
FAQ
Where does this seal install?Between the water pump housing and the engine block to ensure a leak-free connection.
Will it fit both 5.9L and 6.7L Cummins?
Yes. It’s listed for Dodge/Ram applications with 5.9L and 6.7L Cummins from 1989–2018 (verify by ESN for edge cases).
Is this an OEM or aftermarket part?
Aftermarket by Interstate-McBee; built to OEM-equivalent specs and cross-references Cummins 3906698.
Should I replace the O-ring when swapping the water pump?
Yes—replace the seal any time the pump is removed to prevent leaks on reassembly.
Product Videos
Custom Field
YEAR 1989-2018
MAKE DODGE
ENGINE 5.9L,6.7L
