Interstate-McBee M-3955393 Intake/Exhaust Valve Stem Seal – 2003–2018 5.9L/6.7L Cummins

Premium top-hat style valve stem seal engineered by Interstate-McBee as a direct replacement for Cummins 3955393. Designed for precise oil control and long service life on 2003–2018 Dodge/RAM 5.9L & 6.7L Cummins engines. Sold individually; 24 required per engine (fits both intake and exhaust).

• Direct-fit replacement: Interchanges with Cummins 3955393 for ISB/QSB applications.
• Top-hat construction: Metal-molded rubber design for consistent sealing at high temps/loads.
• Intake & exhaust compatible: One part number covers all 24 valves per engine.
• Aftermarket value: Interstate-McBee quality at a lower cost than OEM boxed seals.

Specifications

Vehicle Fitment

For best results, verify by engine serial number (ESN).

• 2003–2007 Dodge/RAM 2500/3500 – 5.9L Cummins (ISB)
• 2007.5–2018 Dodge/RAM 2500/3500 – 6.7L Cummins (ISB)
• Also used across select ISB/QSB industrial variants where 3955393 is specified.

What’s Included

• (1) Valve stem seal, top-hat style

Install Notes

• Replace all 24 seals during service; keep intake/exhaust positions clean and organized.
• Use an appropriate valve spring compressor and follow Cummins service manual procedures.
• Inspect guides and stems; excessive wear can shorten seal life.

Why Buy From CPP Diesel

• ESN-verified fitment assistance from diesel specialists
• Fast shipping and hassle-free returns
• Deep Cummins catalog for one-trip rebuilds

FAQ