Product Description
Interstate-McBee M-4988801 Oil Pump – 03–18 5.9L/6.7L Cummins (Aftermarket Replacement)
Restore factory oil pressure and reliability with the Interstate-McBee M-4988801 oil pump. Built to OEM-equivalent specs for 2003–2018 Cummins ISB applications, this pump uses straight-cut gears for consistent flow and long service life. A cost-effective replacement for high-mileage engines and fresh rebuilds.
- Direct-fit replacement: Matches OEM footprint and flow targets for ISB platforms.
- Straight-cut gear set: Stable delivery and durability under towing and daily use.
- OE-style quality: Manufactured to meet OEM form, fit, and function.
- Aftermarket value: Interstate-McBee performance at a fraction of OEM list price.
Specifications
| Interstate-McBee PN | M-4988801 |
|---|---|
| OEM Cross-Refs | 4988801, 5291050, 3973398, 3957266 |
| Pump Gear Type | Straight-cut |
| Category | Lubricating oil pump (engine) |
| Includes | Complete oil pump assembly (no pickup tube or bolts) |
Vehicle Fitment
Always confirm by VIN/ESN for exact build dates and calibrations.
- Ram 2500/3500 – 5.9L Cummins ISB (Common Rail)
- Model Years: 2003–2007
- Ram 2500/3500/4500/5500 – 6.7L Cummins ISB
- Model Years: 2007.5–2018 (select 2007 models start mid-year)
- Not compatible: 1989–2002 12-valve / early 24-valve 5.9L (uses different pump)
Install Notes
- Prime the pump with clean engine oil during assembly; verify free rotation.
- Follow Cummins service manual procedures and torque specs for your ESN.
- Inspect pickup tube O-ring, pan cleanliness, and pressure relief function.
Warranty
Interstate-McBee new engine components include manufacturer warranty support. For terms and coverage details for oil pumps, contact us or consult the policy sheet.
Cross-Reference
Direct replacement for Cummins 4988801. Common aftermarket and OEM references include 5291050, 3973398, and 3957266.
Why Buy From CPP Diesel
- ESN-verified fitment help from diesel specialists
- Fast shipping, easy returns
- One-stop shop for related gaskets, bolts, and filters
FAQ
Will this pump fit both 5.9L and 6.7L Cummins?Yes—fits 5.9L ISB (2003–2007) and 6.7L ISB (2007.5–2018) Ram applications. Verify with VIN/ESN for mid-year changes.
Is this an OEM Cummins pump?
No—this is an aftermarket Interstate-McBee pump built to OEM-equivalent specifications. OEM Cummins reference is 4988801.
What gear style does it use?
Straight-cut gears for consistent pressure and durability under load.
Do I need new bolts or a pickup tube?
The pump assembly is included; related hardware and pickup components are sold separately. Inspect and replace as needed.
Will this work on 1989–2002 5.9L engines?
No—those earlier 5.9L engines use a different oil pump design. This unit is for 2003+ common-rail and 6.7L platforms.
Product Videos
Custom Field
YEAR 2003-2018
MAKE DODGE
ENGINE 5.9L,6.7L
