Interstate-McBee M-3942659 Valve Cover Bolt Sealing Washer – 98.5–02 5.9L Cummins (Aftermarket Replacement)

Keep oil where it belongs. The Interstate-McBee M-3942659 valve cover bolt sealing washer (also called a noise isolator) restores a tight, leak-free seal on 1998.5–2002 5.9L Cummins 24-valve (ISB) engines. Built to OEM-equivalent dimensions for reliable sealing and vibration damping.

• OEM-style fit: Direct replacement for Cummins 3942659 on B-Series ISB applications.
• Leak control: Elastomer isolator design helps prevent seepage around valve cover fasteners.
• Durable & cost-effective: Interstate-McBee quality at a better value than OEM boxed parts.
• Easy install: Drop-in washer/isolator for quick service during valve cover maintenance.

Specifications

Vehicle Fitment

Always verify by engine serial number (ESN) for exact applications.

• Dodge Ram 2500/3500 – 5.9L Cummins 24-Valve (ISB)
  • Production years: 1998.5, 1999, 2000, 2001, 2002
• Additional usage: Primarily Tier-2 ISB/QSB 5.9L applications in other platforms.

Install Notes

• Replace any hardened, cracked, or flattened washers; clean fasteners and sealing surfaces.
• Seat the isolator squarely; torque valve cover fasteners to the spec in the Cummins service manual.
• Inspect gasket condition; replace the valve cover gasket if swollen or damaged.

What’s Included

• (1) Valve cover bolt sealing washer / isolator

Warranty

Interstate-McBee new parts carry manufacturer warranty coverage. Contact us for current terms and claim procedure details.

Cross-Reference

Cummins 3942659 (Noise Isolator); Interstate-McBee M-3942659.

Why Buy From CPP Diesel

• Diesel specialists with ESN-verified fitment support
• Fast shipping, easy returns
• Inventory curated for Cummins B-Series maintenance

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