Product Description
Interstate-McBee M-3900250 Valve Keeper – 89–98 5.9L Cummins 12-Valve
Premium aftermarket valve keeper (lock/collet) engineered by Interstate-McBee for 1989–1998 Dodge Ram 2500/3500 with 5.9L Cummins 12-valve (6BT) engines. Built to OEM geometry for secure valve stem retention and dependable valvetrain performance. Sold individually; two (2) keepers are required per valve.
- OEM-equivalent fit: Direct interchange with Cummins 3900250 valve collet.
- Hardened steel construction: Precise locking interface for repeatable spring seat pressure.
- Cost-effective replacement: Interstate-McBee quality at aftermarket pricing.
- Sold individually: Order quantity to match your service (2 per valve; 24 pieces for a full 12-valve engine).
Specifications
| Brand / Part | Interstate-McBee M-3900250 |
|---|---|
| OEM Cross-Reference | Cummins 3900250 (Valve Keeper / Valve Collet / Lock, Valve, Half) |
| Engine Family | Cummins B-Series (6BT 5.9L 12-Valve) |
| Material | Hardened steel |
| Sold As | Individual keeper (half) |
| Qty Needed (Full Engine) | 24 keepers (12 valves × 2 halves per valve) |
| Position | Valve spring retainer lock / keeper |
What’s Included
- (1) Valve keeper (lock/collet) – M-3900250
Vehicle Fitment
Always verify by engine serial number (ESN) for exact applications.
- Dodge Ram 2500/3500 – 5.9L Cummins 12-Valve (6BT):
- Model Years: 1989–1998
- Notes: Also used across many Cummins B-Series platforms; select 3.9L 4BT applications may apply (verify by ESN and retainer style).
Install Notes
- Inspect valve stems, retainers, and springs; replace worn components as needed.
- Use appropriate valve spring compressor; confirm keeper seating before releasing spring load.
- Follow the Cummins service manual for procedures and specifications.
Warranty
Interstate-McBee new engine components include manufacturer warranty coverage. Contact us for current terms and eligibility.
Cross-Reference & Related Parts
- OEM Cross-Ref: Cummins 3900250 (Valve Collet / Keeper)
- Common Companion Parts: Valve spring retainer (e.g., M-3900299), valve stem seals, intake/exhaust valves.
Why Buy From CPP Diesel
- ESN-verified fitment support for Cummins B-Series.
- Fast shipping and easy returns.
- Experienced diesel techs on call for build planning and parts matching.
FAQ
How many M-3900250 keepers do I need?Two (2) keepers per valve. A full 5.9L 12-valve engine uses 12 valves, so 24 keepers total.
Will this fit 24-valve (1998.5–2002) ISB engines?
No—M-3900250 is specified for the 12-valve (1989–1998) 6BT setup. 24-valve engines use different keeper/retainer geometry.
Is this an OEM Cummins part?
This is an Interstate-McBee aftermarket keeper built to OEM-equivalent dimensions. If an OEM-boxed part is required, Cummins p/n 3900250 is the genuine equivalent.
Does orientation matter during installation?
Yes—ensure both halves seat correctly in the retainer groove and on the valve stem. Verify fit before releasing spring tension.
Product Videos
Custom Field
YEAR 1989-1998
MAKE DODGE
ENGINE 5.9L
