Product Description
Cummins 4939587 — Genuine Engine Oil Pump for B-Series 5.9L
MPN: 4939587 | Also Known As: lubricating oil pump, lube oil pump | Common Cross-Refs (ID): 3937404, 3941742, 3901175, 3906414, 3914006, 3914008, 3918212, 3924720, 3926203, 3930337
Restore factory oil pressure and flow on your B-series build. This genuine Cummins engine oil pump is a direct-fit replacement for 1989–2002 Ram 5.9L (12-valve & 24-valve) and common 4BT/6BT applications. Built to OE specifications for reliability in towing, work, and daily use.
Features & Benefits
- OE pressure & flow to protect bearings, cam, and turbo.
- Direct-fit install for 5.9L 12V (’89–’98) and 24V VP44 (’98.5–’02) engines.
- Gear-type pump design for durable, consistent lubrication.
- Ideal during overhauls or when correcting low hot-idle oil pressure.
- Genuine Cummins quality and materials.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1993 | 5.9L 12V (VE) | Ram 2500/3500 |
| 1994–1998 | 5.9L 12V (P7100) | Ram 2500/3500 |
| 1998.5–2002 | 5.9L 24V (VP44) | Ram 2500/3500 |
Industrial/Off-Highway: Used widely on 4BT 3.9L and 6BT 5.9L B-series engines; Cummins notes usage primarily on BS3 5.9L B engines. Verify by ESN for equipment applications.
Compatibility Notes:
- Not for 2003+ common-rail 5.9L/6.7L trucks; those use different pumps.
- If your engine was rebuilt with non-OE timing/front-cover parts, confirm pump compatibility before purchase.
Specifications
- Type: Engine lubricating (gear-type) oil pump
- OE Part Number: 4939587
- Common Cross-Refs (ID): 3937404, 3941742, 3901175, 3906414, 3914006, 3914008, 3918212, 3924720, 3926203, 3930337
- Quantity Required: 1 per engine
Often Paired With
- Oil pan gasket & pickup tube seal/O-ring (replace if hardened or damaged)
- Front cover/timing cover gasket set (as needed during service)
- Fresh oil & filter after installation and first heat cycle
What’s In The Box
- (1) Genuine Cummins Engine Oil Pump (4939587)
Installation Tips
- Pre-lube the pump with clean engine oil before installation.
- Inspect pickup tube and screen; replace damaged seals and torque fasteners to spec.
- Prime the system, verify oil pressure on first start, and recheck for leaks after warm-up.
FAQ
WILL THIS FIT MY 1989–2002 5.9L CUMMINS RAM?
Yes—this OE pump covers 5.9L 12-valve and 24-valve VP44 engines from 1989–2002. Confirm by VIN/ESN if unsure.
DOES IT FIT 2003+ 5.9L OR ANY 6.7L?
No—common-rail engines use different pumps and part numbers.
WHAT ARE COMMON CROSS-REFERENCE NUMBERS?
Frequently seen IDs include 3937404, 3941742, 3901175, 3906414, 3914006, 3914008, 3918212, 3924720, 3926203, and 3930337.
HOW DO I KNOW MY OIL PUMP NEEDS REPLACEMENT?
Low hot-idle oil pressure (with correct viscosity), metallic debris, or excessive wear during teardown are common indicators.
IS THIS A GENUINE CUMMINS PART?
Yes—OE Cummins 4939587.
