Product Description
Interstate-McBee M-3900250 Valve Keeper – 89–98 5.9L Cummins 12-Valve
OEM-style split valve locks (keepers) for the 1989–1998 Dodge Ram 2500/3500 with the 5.9L Cummins 12-valve (6BT). Designed to secure the valve spring retainer to the valve stem for reliable valvetrain service. Sold as a pair (two halves) per valve.
- Direct replacement: Matches factory form, fit, and function.
- Consistent clamping: Precision-made to pair correctly with stock retainers.
- Service friendly: Ideal for top-end refreshes or head rebuilds.
- Value: Interstate-McBee quality at a competitive price.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3900250 |
| OEM Reference | Cummins 3900250 |
| Sold As | Pair (2 halves for one valve) |
| Qty Required (12V) | 12 pairs (one pair per valve) |
| Position | Valve lock / keeper (valvetrain) |
What’s Included
- (1) Pair of valve keepers, P/N M-3900250
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins (12-valve 6BT)
- Model Years: 1989–1998
- Additional B-Series applications (4B/6B) where Cummins 3900250 is specified (confirm by ESN).
Recommended/Related Parts
- Interstate-McBee M-3900299 Valve Spring Retainer
- Interstate-McBee M-3802355 Intake Valve Kit
- Interstate-McBee M-3802356 Exhaust Valve Kit
- Interstate-McBee M-3283335 Head Gasket (12-Valve)
Install Notes
- Use a proper valve spring compressor; wear eye protection.
- Confirm keeper-to-retainer compatibility and verify correct seating.
- Service one valve at a time and follow the Cummins service manual.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of complementary B-Series valvetrain parts
FAQ
Will these keepers fit my 1989–1998 5.9L Cummins?
Yes—this listing covers the 12-valve 5.9L Cummins used in 1989–1998 Dodge Ram 2500/3500. For edge cases, verify by ESN.
How many do I need?
The 12-valve 5.9L uses 12 pairs—one pair per valve. Keepers are sold as a pair.
Are retainers included?
No. Retainers are sold separately. See the M-3900299 link above.
Does this fit 24-valve (1998.5–2002) engines?
No. This part is for 12-valve engines only.
