Product Description
Interstate-McBee M-4939587 High Volume Oil Pump – 1989–2002 5.9L Cummins (12V/24V)
The Interstate-McBee M-4939587 is an OEM-style high-volume lubricating oil pump for 1989–2002 Dodge Ram 2500/3500 trucks equipped with the 5.9L Cummins (12-valve and early 24-valve ISB). Built for consistent oil delivery and long service life, it’s a smart upgrade during refreshes, rebuilds, or performance builds.
- Direct-fit replacement: Matches OE specifications for straightforward install and proper clearances.
- High-volume design: Popular upgrade over early 12-valve pumps to improve flow at load and idle stability.
- Heavy-duty construction: Precision-machined internals for consistent pressure and durability.
- Aftermarket value: Interstate-McBee quality at a better price than a boxed OEM unit.
Specifications
| Brand | Interstate-McBee |
|---|---|
| Part Number | M-4939587 |
| OE Reference | Cummins 4939587 |
| Additional Cross-References | 3901175, 3906414, 3914006, 3914008, 3924720, 3926203, 3937404, 3941742, 3930337 |
| Application | Cummins B-Series (5.9L 12V/24V); select 4BT/ISB/QSB — verify by ESN |
| Weight (approx.) | ~5 lb |
| Includes | Oil pump assembly (gaskets/O-rings sold separately) |
Vehicle Fitment
Always verify using your engine serial number (ESN) for exact compatibility.
- Dodge Ram 2500/3500 – 5.9L Cummins
- 1989–1998 12-Valve 6BT
- 1998.5–2002 24-Valve ISB
- Other B-Series: Common on select 4BT/ISB/QSB industrial/ag applications (confirm by ESN).
Install Notes
- Drain oil and remove the oil pan per service manual; clean pickup screen and replace pickup tube O-ring.
- Prime the pump with clean engine oil or assembly lube before installation.
- Torque fasteners to the Cummins spec and verify relief valve function; check hot idle oil pressure on first start.
Warranty
Interstate-McBee new engine components include manufacturer warranty coverage. For exact terms on this oil pump, please contact us with your ESN and order details.
Cross-Reference & Compatibility
Replaces Cummins 4939587 and cross-references 3901175, 3906414, 3914006, 3914008, 3924720, 3926203, 3937404, 3941742, 3930337. Used across B-Series platforms; confirm by ESN for non-Dodge applications.
Why Buy From CPP Diesel
- Expert Cummins B-Series fitment support (ESN verification available).
- Fast shipping, easy returns, and performance-minded catalog curation.
- Tech guidance for complementary parts (pickup tube O-ring, pan gasket, oil, filter).
