Product Description
Cummins 3914403 — Genuine Engine Oil Pan for 5.9L 6BT (’89–’93)
MPN: 3914403 | Also Known As: engine oil pan, sump, lower pan | Cross-Refs (ID only): Mopar 4429403, Cummins 3911505
Genuine Cummins stamped-steel oil pan for first-gen 5.9L 12-valve trucks. Direct-fit replacement with factory contours and drain provision. Ideal when your original pan is rusted, dented, or has damaged threads.
Features & Benefits
- OE fit & geometry for 1989–1993 5.9L 12V (6BT) applications.
- Stamped steel construction for durability and heat shedding.
- Factory drain port (M18 x 1.5) for easy service; plug sold separately.
- Corrosion-resistant coating for long service life.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1993 | 5.9L 12V (6BT) | Dodge/Ram 250/350, 2500/3500 |
Industrial/Off-Highway: 6B5.9 / B5.9 G families (verify by ESN before ordering).
Compatibility Notes:
- Designed for ’89–’93 first-gen 5.9L trucks. Later pans differ; do not mix with 2003+ pans.
- Drain plug is typically M18 x 1.5 and not included with most pans.
Specifications
- Type: Engine oil pan (stamped steel)
- OE Part Number: 3914403
- Drain Port Thread: M18 x 1.5 (plug not included)
- Finish: Coated steel
- Quantity Required: 1 per engine
Often Paired With
- Oil pan gasket (’89–’02 5.9L): Cummins 3959052 (also seen as 3911536, 3904577, 3906028, 3931346, 3937072)
- Drain plug: Cummins 3973071 (M18 x 1.5) with sealing washer
- Fresh oil & filter: change after installation
What’s In The Box
- (1) Genuine Cummins Engine Oil Pan (3914403)
- Gasket, drain plug, and hardware sold separately (see “Often Paired With”).
Installation Tips
- Support the engine/crossmember as needed; follow OE removal steps.
- Clean mating surfaces; use the correct oil pan gasket and torque evenly in sequence.
- Install a new drain plug/seal; verify no interference with pickup.
- Refill oil, start, and check for leaks after warm-up.
FAQ
WILL THIS FIT MY 1989–1993 5.9L CUMMINS?
Yes—3914403 is the OE-style oil pan for first-gen 5.9L 12-valve (1989–1993). Confirm by VIN/ESN if unsure.
DOES IT INCLUDE A DRAIN PLUG?
Typically no. Order plug 3973071 (M18 x 1.5) or an equivalent magnetic plug.
DO I NEED A GASKET OR RTV?
Use the dedicated pan gasket—common choice is 3959052 on ’89–’02 5.9L. Replace if old or brittle.
CAN I USE THIS ON 1994–2002 TRUCKS?
No. Those years use a different pan. Match the pan to your model year for correct fit.
IS THIS A GENUINE CUMMINS PART?
Yes—OE Cummins 3914403 with factory fit and finish.
