Product Description
Cummins 3929028 — Camshaft Gear (Timing Gear) for B-Series 5.9L
MPN: 3929028 | Also Known As: cam gear, timing gear | Cross-Refs: 3902235, 3907431, 3912884, 3929030
Why This Part
- ✓ OE timing accuracy to keep the cam and crank synchronized.
- ✓ Direct-fit replacement for 5.9L 12-valve applications.
- ✓ Durable OEM metallurgy for long service life under diesel loads.
- ✓ Restores factory valve-train timing after wear or damage.
Quick Specs
| Type | Camshaft timing gear |
|---|---|
| OE Part # | 3929028 |
| Cross-References | 3902235, 3907431, 3912884, 3929030 |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1993 | 5.9L Cummins 12-Valve (6BT) | D/W 250 & 350 |
| 1994–2000 | 5.9L Cummins 12-Valve (6BT) | Ram 2500/3500 |
Compatibility Notes: This gear is used primarily on 12-valve B-series applications. Many 24-valve (1998.5–2002) engines require a tone-ring cam gear, commonly Cummins 3942755. Always verify by VIN/ESN and sensor style before ordering.
Often Paired With
- Cam Key: 3902332
- Cam Thrust Plate / Retainer: 3927155
- Matching Camshaft (12V): 3929734
What’s In The Box
- (1) Genuine Cummins Camshaft Gear (3929028)
- Keys/retainers sold separately (see “Often Paired With”).
Install Tips
- Set engine at TDC and align timing marks per the Cummins service manual.
- Use the correct cam key; verify interference fit and torque specs by ESN.
- After assembly, bar the engine over by hand to confirm smooth rotation.
FAQ
WILL THIS FIT MY 1989–2000 12-VALVE 5.9L?Yes—3929028 is commonly used on 12-valve 5.9L (1989–2000) Ram applications. Verify by VIN/ESN.
DOES THIS WORK ON 24-VALVE (1998.5–2002) ENGINES?Many 24-valve engines require a tone-ring cam gear (often 3942755) to drive the cam sensor. Confirm sensor style and ESN before purchase.
WHAT RELATED PARTS SHOULD I REPLACE?We recommend a new cam key (3902332) and thrust plate/retainer (3927155). Replace fasteners where specified by Cummins.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3929028 for proper fit and timing integrity.
WHAT ARE THE COMMON CROSS-REFERENCES?Typical IDs include 3902235, 3907431, 3912884, and 3929030, used by various catalogs for identification.
