Product Description
Interstate-McBee M-3955393 Intake/Exhaust Valve Stem Seal – 2003–2018 5.9L/6.7L Cummins (24-Valve)
OE-style valve stem seal that controls oil at the valve guide on 2003–2018 Dodge Ram with the 5.9L/6.7L Cummins 24-valve. Designed for dependable sealing on both intake and exhaust valves. Sold individually.
- Dual-position use: One part number fits both intake and exhaust valves.
- Direct replacement: Matches Cummins reference 3955393 for correct fit and function.
- Service friendly: Ideal for top-end refreshes, head work, and oil-control repairs.
- Value: Interstate-McBee quality at an aftermarket price.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3955393 |
| OEM Reference | Cummins 3955393 |
| Application | Valve stem seal – Intake & Exhaust |
| Sold As | Each (1 seal) |
| Qty Required (per engine) | 24 seals (4 valves × 6 cylinders) |
What’s Included
- (1) Valve stem seal, P/N M-3955393
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 with Cummins 24-valve diesel:
- 5.9L (Common-Rail): 2003–2007
- 6.7L: 2007.5–2018
- Additional B-Series applications where Cummins 3955393 is specified (confirm by ESN).
Recommended/Related Parts
- Valve stem seal installer tool
- Valve locks/keepers
- Valve springs & retainers
- Intake and exhaust valve kits
- Cylinder head gasket & top-end gasket set
Install Notes
- Use the proper installer to avoid damaging the seal lip; lightly oil the valve stem.
- Verify seal height and seating on the guide; replace any worn guides.
- Service one valve at a time and follow the Cummins service manual procedures.
FAQ
How many seals do I need?
Each 24-valve engine requires 24 seals—one per valve.
Is this for intake or exhaust?
This part fits both intake and exhaust valves.
Does it fit 12-valve engines (1989–1998)?
No. This listing is for 24-valve 5.9L/6.7L applications only.
What comes in the box?
One valve stem seal. Valves, springs, retainers, and keepers are sold separately.
