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.
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.
Specifications for Interstate-McBee M-3955393
| Brand | Interstate-McBee |
| Part Number | M-3955393 |
| UPC | Not specified by manufacturer/seller |
| GTIN | Not specified by manufacturer/seller |
| Shipping Info | Typical package weight for individual valve stem seal: < 0.25 lb. Exact shipping weight/dimensions: Not specified. |
| Cross Reference | OE style replacement for Cummins 5.9L/6.7L valve stem seal applications listed for 2003–2018 engines. Specific OE/Cummins cross reference numbers are not published by Interstate-McBee for this part. |
| E-Codes | Not specified |
| Prop 65 | WARNING: This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more information: https://www.P65Warnings.ca.gov |
