Interstate-McBee M-3957912 Valve Stem Seal – 89–98 5.9L Cummins (Top-Hat Style)

OEM-style top-hat valve stem seal engineered by Interstate-McBee for the 1989–1998 5.9L Cummins 12-valve plus select 3.9L 4BT B-Series applications. Built for reliable sealing, reduced oil consumption, and long service life at an aftermarket price.

• Direct replacement: Aftermarket equivalent to Cummins 3957912.
• Top-hat design: Stable sealing that resists riding up on the valve stem.
• Durable construction: Quality materials to meet or exceed OEM fit and function.
• Sold individually: Order 12 pcs for a complete 12-valve cylinder head.

Specifications

Vehicle Fitment

Verify by engine serial number (ESN) when possible.

• Dodge Ram 2500/3500 – 5.9L Cummins 12-Valve (6BT)
  • 1989–1993 (VE pump)
  • 1994–1998 (P-pump)
• Industrial/Commercial: 3.9L 4BT B-Series applications (varies by ESN).

Install Notes

• Many OEM heads with original “old-style” seals may require machining to accept top-hat seals; heads already using top-hat seals are typically direct-fit.
• Always follow Cummins service procedures for valve spring removal and seal installation.
• Inspect valve guides; replace any excessively worn components before installing new seals.

What’s Included

• (1) Valve stem oil seal (top-hat style)

Warranty

Interstate-McBee new engine parts carry manufacturer warranty coverage; valve-train components are typically 12 months from date of installation. Contact us for details.

Why Buy From CPP Diesel

• ESN-verified fitment support from real diesel techs
• Fast shipping and hassle-free returns
• Deep B-Series inventory for one-trip checkout

FAQ