Product Description
The Cummins 3929028 OEM Camshaft Gear is a genuine, factory-precision timing gear for the 1989–2000 5.9L 12-Valve Cummins (6BT). This gear is responsible for transferring crankshaft rotation to the camshaft with perfect synchronization, maintaining accurate valve timing, injection timing, and overall engine performance. Genuine Cummins gears are heat-treated, machined, and balanced to OEM standards, ensuring long-term durability and quiet, stable operation of the 6BT’s gear-driven timing system.
When performing a camshaft replacement, timing service, performance build, or complete engine overhaul, the 3929028 cam gear is the correct OE component for restoring factory timing accuracy and reliability in your 12-Valve Cummins engine.
Fitment
- 1989–1993 Dodge D/W 250 & 350 with 5.9L 12-Valve Cummins
- 1994–1998 Dodge Ram 2500/3500 with 5.9L 12-Valve Cummins
- Industrial B-Series 6BT engines where ESN specifies 3929028
Note: Always verify by ESN for industrial/off-highway applications.
Cross-Reference (Cummins-Only)
Related timing and valvetrain OEM components:
• Cummins 3903924 OEM Timing Pin
• Cummins 3904409 OEM Valve Stem Guide – 51.75mm
• Cummins 3904408 OEM Valve Stem Guide – 60.50mm
FAQ
Is this cam gear correct for all 12-Valve 5.9L Cummins engines?
Yes — this is the OEM camshaft gear used on 1989–2000 5.9L 12-Valve B-Series engines where a mechanical camshaft is used.
Does the Cummins 3929028 gear need to be pressed onto the camshaft?
Yes. It is a press-fit gear and requires proper heating and installation methods per Cummins service procedures.
Should I replace the gear when installing an aftermarket camshaft?
Most cam manufacturers recommend replacing the OEM cam gear to ensure reliable timing, correct tooth engagement, and long-term durability.
Does this gear come pre-timed or marked?
It includes the OEM timing mark to align the camshaft correctly with the crankshaft gear.
Is this compatible with P-pump engines?
Yes — it fits P7100-equipped 12-Valve Cummins engines from 1994–1998 and pre-1994 VE-pump models.
Specifications for cummins 3929028
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3929028 |
| Component Type | Camshaft Timing Gear |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used across 12V 6BT timing assemblies |
| E-Codes | N/A |
| Shipping Weight | 4.0 lbs (approx.) |
| Package Dimensions | 8 x 8 x 2 in |
| Prop 65 Warning | Not Applicable |
