Product Description
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
| Manufacturer | Interstate-McBee |
|---|---|
| Part Number | M-3955393 |
| OEM Reference | Cummins 3955393 |
| Style | Top-hat (intake & exhaust) |
| Sold As | Individual seal (24 required per engine) |
| Application Family | Cummins ISB/QSB |
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
Does M-3955393 fit both intake and exhaust valves?Yes. This seal directly replaces Cummins 3955393 and is used on both intake and exhaust positions; you’ll need 24 per engine.
Is it sold individually or as a set?
Sold individually. Order the quantity needed (typically 24 for a complete set).
What style is this seal?
Top-hat (metal-molded rubber) design for reliable oil control and durability.
Will it work on both 5.9L and 6.7L Cummins?
Yes—applications cover 2003–2007 5.9L and 2007.5–2018 6.7L Cummins where 3955393 is specified.
Product Videos
Custom Field
YEAR 2003-2018
MAKE DODGE
ENGINE 5.9L,6.7L
