Product Description
Interstate-McBee M-3942659 Valve Cover Bolt Sealing Washer – 98.5–02 5.9L Cummins (24-Valve)
OE-style sealing washer for the valve cover bolts on 1998.5–2002 Dodge Ram 2500/3500 trucks equipped with the 5.9L Cummins 24-valve (ISB). Restores a proper seal around the bolt head to help prevent oil mist and seepage. Sold individually.
- Direct replacement: Matches the dimensions of the factory sealing washer for a secure fit.
- Leak control: Helps seal the bolt head/valve cover interface to reduce oil seep.
- Durable construction: Built for high-temp, under-hood environments.
- Budget-friendly: Interstate-McBee quality as a cost-effective alternative to OEM boxed parts.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3942659 |
| OEM Reference | Cummins 3942659 |
| Sold As | Each (1 sealing washer) |
| Position | Valve cover bolt sealing washer |
What’s Included
- (1) Valve cover bolt sealing washer, P/N M-3942659
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 5.9L Cummins (24-valve ISB)
- Model Years: 1998.5–2002
- Additional B-Series applications where Cummins 3942659 is specified (confirm by ESN).
Recommended/Related Parts
- Valve cover gasket (24-valve ISB)
- Valve cover bolt (matching application)
- Breather grommet / gaskets as required
Install Notes
- Replace any hardened, flattened, or cracked sealing washers during service.
- Clean mating surfaces; avoid oil on the washer face during installation.
- Tighten valve cover bolts to factory torque spec—do not over-tighten.
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Deep inventory of complementary Cummins ISB service parts
FAQ
Will this fit my 1998.5–2002 5.9L Cummins?
Yes—this listing covers the 24-valve ISB used in 1998.5–2002 Dodge Ram 2500/3500 trucks. For edge cases, verify by ESN.
How many do I need?
Quantity varies by application. Inspect your engine and count the valve cover bolt locations; order one washer per bolt.
Can I reuse old sealing washers?
Reusing is not recommended. Aged washers may not reseal properly; replace during service to prevent leaks.
