Product Description
Interstate-McBee M-4988801 Oil Pump – 03–18 5.9L / 6.7L Cummins
High-quality aftermarket replacement oil pump for the 2003–2018 Cummins ISB 5.9L and 6.7L engines. Restores proper oil pressure and lubrication to protect bearings, cam, and turbocharger. Sold individually.
- Direct replacement: Built to OE form, fit, and function for dependable oiling performance.
- Durable construction: Precision-machined gear set and housing for long service life.
- Service friendly: Installs like stock; no tuning required.
- Value: Interstate-McBee quality at a fraction of OEM boxed pricing.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-4988801 |
| OEM Reference | Cummins 4988801 |
| Engine | ISB 5.9L (’03–’07) / ISB 6.7L (’07.5–’18) |
| Sold As | Each (1 oil pump assembly) |
| Position | Lubrication system (front cover mounted) |
What’s Included
- (1) Oil pump assembly, P/N M-4988801
Vehicle Fitment
Always verify by engine serial number (ESN) when possible.
- Dodge Ram 2500/3500 with Cummins ISB:
- 5.9L: 2003–2007
- 6.7L: 2007.5–2018
- Additional ISB applications where Cummins 4988801 is specified (confirm by ESN).
Install Notes
- Drain engine oil and remove the front cover components per the factory service manual.
- Inspect and replace the pickup tube O-ring and related gaskets/seals as needed.
- Pre-lube (prime) the pump with clean engine oil during assembly.
- Verify proper pump seating and endplay; tighten fasteners to factory torque specs.
- Refill with the correct oil and check for leaks; confirm oil pressure at first start.
Recommended/Related Parts
- Oil pickup tube O-ring / gasket set (verify by ESN)
- Front cover gasket & seal kit
- Oil filter (OE-equivalent)
- Engine oil meeting the correct spec/viscosity
Why Buy From CPP Diesel
- ESN-verified fitment support from diesel specialists
- Fast shipping, easy returns, competitive pricing
- Extensive inventory of Cummins ISB service parts
FAQ
Will this fit both 5.9L and 6.7L ISB engines?
Yes—this pump targets ISB 5.9L (2003–2007) and ISB 6.7L (2007.5–2018) applications that call for Cummins 4988801. Always verify by ESN.
Is hardware or a pickup tube included?
No. This listing is for the oil pump assembly only. Replace gaskets/seals and the pickup tube O-ring during service.
Do I need to prime the pump?
Yes. Pre-lubing the pump with clean engine oil during assembly helps ensure immediate oil pressure on startup.
