Product Description
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
| Part Number | M-3942659 (Interstate-McBee) |
|---|---|
| OEM Reference | 3942659 (Cummins) – a.k.a. “Noise Isolator” |
| Position | Valve cover bolt sealing washer / isolator |
| Engine Family | Cummins ISB/QSB B-Series |
| Sold As | Each (order required quantity for your valve cover fasteners) |
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
FAQ
Is this the same as the Cummins “Noise Isolator”?Yes. Cummins refers to part 3942659 as a Noise Isolator. This Interstate-McBee piece is an OEM-style replacement for that part.
How many washers do I need?
Order the quantity to match your valve cover fasteners. Check your engine’s cover style and count before purchasing.
Will this fit 12-valve (1989–1998) engines?
No. It is listed for 1998.5–2002 5.9L Cummins 24-valve (ISB). The 12-valve uses different hardware.
Torque specs?
Follow the Cummins service manual for valve cover fastener torque. Do not overtighten.
Product Videos
Custom Field
YEAR 1998.5-2002
MAKE DODGE
ENGINE 5.9L
