Product Description
Interstate-McBee M-3939258 Lift Pump Cover Plate Gasket – 1989–1998 5.9L Cummins
Premium aftermarket cover plate gasket for the mechanical fuel transfer (lift) pump on 1989–1998 Dodge Ram 2500/3500 with 5.9L Cummins (12-valve). Built to OEM-style dimensions for a reliable, leak-free seal between the pump and engine block.
- Direct replacement: OEM cross-ref
3939258for accurate fit and easy installation. - Quality materials: Formulated to resist diesel, oil mist, and heat at the lift-pump mounting surface.
- Aftermarket value: Interstate-McBee performance at significant savings vs. OEM boxed parts.
Specifications
| Interstate-McBee P/N | M-3939258 |
|---|---|
| OEM Reference | Cummins 3939258 (cover plate gasket) |
| Function | Lift pump / cover plate gasket (block interface) |
| Position | Engine block, mechanical fuel transfer pump mounting |
| Material | Fuel-resistant gasket composite |
Vehicle Fitment
Always verify by engine serial number (ESN) for exact applications.
- Dodge Ram 2500/3500, 5.9L Cummins (12-Valve)
- Model Years: 1989–1998
- Application: Mechanical fuel transfer (lift) pump to block
Compatibility & Cross-Refs (engines & alternates)
Common across Cummins B-Series families including 4BT3.9, 6BT5.9, and select ISB/QSB variants. Known alternates/cross-refs include: 3903664, 3904044, 3914304, 3923054, 3931059.
Install Notes
- Clean both mating surfaces thoroughly; remove old gasket residue without scratching the block.
- Dry-fit to confirm alignment; follow the service manual for fastener torque and sequence.
- Replace gasket any time the lift pump is removed.
What’s Included
- (1) Lift pump cover plate gasket (M-3939258)
Warranty
Interstate-McBee new engine parts are backed by the manufacturer’s warranty program. Contact us for details on coverage for gasket components.
Why Buy From CPP Diesel
- Tech-verified fitment for 12-valve 5.9L Cummins platforms
- Fast shipping and easy returns
- Real diesel experts—ESN support available
FAQ
Will this gasket fit all 1989–1998 5.9L Cummins trucks?Yes, this cover plate gasket is listed specifically for 1989–1998 Dodge Ram 5.9L Cummins with a mechanical lift pump. Verify by ESN for edge-case builds or component swaps.
Is this an OEM Cummins part?
This listing is for the Interstate-McBee aftermarket version (
What engines besides the 5.9L 12-valve use 3939258?
M-3939258) built to OEM-style specifications. If you need a genuine Cummins-boxed part, ask for Cummins 3939258.The 3939258 cover plate gasket is also used across B-Series families such as the 4BT3.9 and select ISB/QSB variants. Check your engine data plate to confirm.
Do I need sealant with this gasket?
Typically no—install it dry unless the Cummins service manual specifies otherwise. Always follow factory procedures.
Product Videos
Custom Field
YEAR 1989-1998
MAKE DODGE
ENGINE 5.9L
