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)

Industrial/Off-Highway: 6B5.9 / B5.9 G families (verify by ESN before ordering).

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.