Product Description

CUMMINS 3903924 OEM TIMING PIN – 5.9L 12-VALVE (1989–1998)

The genuine CUMMINS 3903924 OEM timing pin is the factory-correct tool used to lock the injection pump gear in place when setting or verifying timing on the legendary 5.9L 12-valve Cummins. Whether your truck runs the VE rotary pump (1989–1993) or the P7100 mechanical pump (1994–1998), this hardened OEM timing pin ensures precision alignment, accurate timing adjustments, and trouble-free reassembly.

Cheap imitation pins can bend or mushroom, causing inaccurate timing and potential pump damage. This OEM Cummins timing pin is engineered to withstand repeated use in professional and DIY applications. If you're performing injection pump swaps, timing adjustments, or top-end service, this pin is a required tool.

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Fitment Details

• Engine: 5.9L Cummins B-Series 12-Valve
• Years: 1989–1998
• Injection Pumps: VE44 (1989–1993), P7100 (1994–1998)
• Function: Locks pump gear for accurate top dead center and injection timing procedures

Always verify timing marks and service procedures per Cummins guidelines.

Cross-Reference & Related Cummins Components

This timing pin is commonly used alongside other Cummins OEM service parts:

• CUMMINS 3931593 INJECTION PUMP GEAR COVER GASKET
• CUMMINS 3920381 FRONT STRUCTURE GASKET – 5.9L
• VIEW ALL GENUINE CUMMINS PARTS

Cross-reference numbers: 3903924 only (no alternates listed by Cummins).

Installation Notes

• Use only on engines rotated by hand when aligning timing marks.
• Do not apply excessive torque; this is a locating pin, not a load-bearing fastener.
• Inspect the pump gear bore for debris before insertion.
• Remove the timing pin before cranking the engine.

Specifications for cummins 3903924

Frequently Asked Questions

IS THIS THE CORRECT TIMING PIN FOR BOTH VE AND P7100 PUMPS?

Yes. Cummins 3903924 is the OEM timing pin used for timing procedures on both VE (1989–1993) and P7100 (1994–1998) injection pumps.

CAN A NON-OEM TIMING PIN DAMAGE THE PUMP?

Yes. Off-brand pins may bend or deform, compromising timing accuracy or damaging the pump gear bore. This is why we recommend only genuine Cummins for timing work.

DO I NEED TO REMOVE THE PIN BEFORE STARTING THE ENGINE?

Absolutely. The pin must only be used during hand-rotation alignment. Never crank or run the engine with the pin installed.

HOW OFTEN SHOULD THE TIMING PIN BE REPLACED?

OEM timing pins rarely need replacement unless they become worn, bent, or damaged during service work.