Product Description
CUMMINS 3903924 OEM TIMING PIN – 5.9L 12-VALVE (1989–1998)
The genuine CUMMINS 3903924 OEM timing pin is the correct alignment tool used to lock the VE or P7100 injection pump into its proper timing position during service. Whether you’re installing a new pump, setting base timing, or verifying timing on a performance build, this OE-engineered steel timing pin provides accurate and repeatable alignment on all 1989–1998 5.9L 12-valve Cummins engines.
This is the same factory-spec timing pin used in dealership and Cummins service procedures. Many aftermarket copies deform or taper incorrectly, causing inaccurate timing or damaging the pump housing. Avoid downtime and guarantee precision with authentic Cummins hardware.
Fitment Details
- Engine: 5.9L 12-Valve Cummins (6BT) – VE & P7100 pumps
- Model Years: 1989–1998
- Vehicles: Dodge Ram 2500 / 3500 (based on engine installed)
- Pump Types: Bosch VE & Bosch P7100 (P-pump)
Always verify compatibility by VIN/ESN before ordering.
Cross-Reference & Related Cummins Components
- CUMMINS 3921983 TIMING GEAR CASE GASKET
- CUMMINS 3933973 FRONT CRANKSHAFT SEAL KIT
- CUMMINS 3931713 WOODRUFF KEY – CRANKSHAFT
- VIEW ALL CUMMINS OEM PARTS
Cross-reference: 3903924 (no supersessions published)
Installation Notes
- Rotate the engine slowly by hand until the timing pin drops into the pump indexing slot.
- Do not force the pin — if it does not seat, rotate the engine slightly and try again.
- Always remove the timing pin before cranking or starting the engine.
- Use only genuine Cummins pins to prevent housing damage or incorrect timing.
Specifications for cummins 3903924
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Part Number | 3903924 |
| Function | Injection pump timing alignment pin |
| Engine Compatibility | 5.9L 12-Valve Cummins (VE & P7100) |
| Vehicle Fitment | 1989–1998 Dodge Ram 2500/3500 (based on engine) |
| UPC | Not supplied by Cummins |
| GTIN | Not supplied by Cummins |
| Shipping Weight | Approx. 0.05 lb |
| Shipping Method | Standard ground (expedited available) |
| E-Codes | Used on non-certified 6BT engines; consult Cummins data for emissions families |
| Prop 65 Warning | WARNING: This product may expose you to chemicals known to the State of California to cause cancer or reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by batch) |
Frequently Asked Questions
IS THIS THE CORRECT TIMING PIN FOR BOTH VE AND P7100 PUMPS?
Yes. The CUMMINS 3903924 timing pin is used on both VE and P7100 pumps found on 1989–1998 5.9L 12-valve engines.
CAN USING AN AFTERMARKET PIN CAUSE TIMING ISSUES?
Yes. Many aftermarket pins have incorrect taper or hardness. Genuine Cummins pins ensure proper alignment and prevent pump housing wear.
DOES THIS PIN LOCK THE ENGINE OR JUST THE PUMP?
The pin locks the injection pump at the correct reference point. It does not lock the crankshaft.
SHOULD I REPLACE THIS PIN DURING A TIMING COVER OR PUMP SERVICE?
Yes. Replacing the timing pin prevents binding, sticking, or deformation that leads to incorrect timing readings.
CAN I START THE ENGINE WITH THE PIN INSTALLED?
No. The timing pin must always be removed before cranking or starting the engine.
