Interstate-McBee M-3946168 Valve Cover Captive Isolator Cap Screw – 98.5–02 5.9L Cummins

Replace worn or missing valve cover hardware with the Interstate-McBee M-3946168 captive isolator cap screw. Built to OEM-equivalent dimensions for the 1998.5–2002 Dodge Ram 2500/3500 5.9L Cummins 24-valve (ISB), this bolt secures the rocker/valve cover and helps maintain a reliable seal when paired with the correct washer and gasket.

• Direct replacement: Aftermarket equivalent to OEM 3946168 for BS3 5.9L B-series engines.
• Captive isolator design: Helps control vibration and protects sealing surfaces for long-term reliability.
• Precise fitment: Engineered to OEM spec for straightforward install with factory covers.
• Value: Premium Interstate-McBee quality at a cost-effective price point.

Specifications

Vehicle Fitment

Always verify with your engine serial number (ESN) for exact compatibility.

• Dodge Ram 2500 / 3500 — 5.9L Cummins 24-valve (ISB)
  • Model Years: 1998.5, 1999, 2000, 2001, 2002

What’s Included

• (1) Valve cover captive isolator cap screw (bolt) – M-3946168

Recommended Companion Parts

• Valve cover sealing washer (Cummins 3942659) – replace when changing bolts.
• Valve cover gasket (Cummins 3935878) – inspect/replace if flattened or leaking.

Install Notes

• Clean the bolt bore and sealing surfaces; remove old debris and oil.
• Use the correct torque per the Cummins service manual for your ESN.
• Replace all washers; avoid mixing old hardware with new fasteners.

Warranty

New Interstate-McBee engine parts are generally covered for 24 months from installation; select valve-train components may be 12 months. See manufacturer policy for details.

Why Buy From CPP Diesel

• Tech-backed fitment and ESN verification.
• Fast shipping and hassle-free returns.
• Curated 5.9L Cummins parts to complete the job in one order.

FAQ