Product Description
Genuine Cummins
Cummins 3955393 — Valve Stem Seal (Intake & Exhaust)
MPN: 3955393 | Also Known As: valve stem oil seal, valve seal, top-hat seal | Sold: Individually (24 required per engine)
Why This Part
- ✓ OE material & profile for proper valve stem sealing and oil control.
- ✓ Fits both intake and exhaust positions on ISB 5.9L & 6.7L.
- ✓ Direct-fit replacement to restore factory performance and reduce oil consumption.
- ✓ Sold individually so you can buy exactly what you need (24 per engine).
OE Fit Intake & Exhaust 24 Per Engine
Quick Specs
| Type | Valve stem oil seal (“top-hat” style) |
|---|---|
| OE Part # | 3955393 |
| Positions | Intake & Exhaust (interchangeable) |
| Qty Required | 24 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
| 2007.5–2018 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Industrial/Off-Highway: Also used on various ISB/QSB engines (e.g., BS3 5.9L). Verify by ESN for non-automotive applications.
Often Paired With
- Valve spring compressor tool (24-valve)
- Valve cover gasket and grommets (year-specific)
- New valve locks/keepers if wear is present
What’s In The Box
- (1) Genuine Cummins Valve Stem Seal (3955393)
Install Tips
- Replace all 24 seals during a head refresh for consistent sealing.
- Note any OEM seal color markings during teardown and match as required.
- Use proper tools; avoid nicking valve stems or guides.
FAQ
DOES 3955393 FIT BOTH INTAKE AND EXHAUST VALVES?Yes—this OE seal fits either intake or exhaust positions on ISB 5.9L & 6.7L applications.
HOW MANY SEALS DO I NEED?Each 24-valve Cummins uses 24 valve stem seals (sold individually).
WHAT YEARS/TRUCKS DOES THIS COVER?Automotive coverage is 2003–2007 Ram 5.9L ISB and 2007.5–2018 Ram 6.7L ISB. Always verify by VIN/ESN.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3955393 with correct material and profile for long service life.
CAN I REPLACE JUST THE LEAKING SIDE?You can, but best practice is to replace all 24 seals to ensure uniform sealing and longevity.
Product Videos
Custom Field
Vehicle Year 2003,2004,2005,2006,2007,2008,2009,2010,2011
Vehicle Make DODGE
ENGINE 5.9L,6.7L
Part Type Intake Valve Seal
