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

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