Product Description
The CUMMINS 3920921 OEM P7100 INJECTION PUMP GEAR NUT is a genuine Cummins replacement fastener designed for 1994-1998 Dodge Ram 5.9L Cummins 12-valve engines equipped with the Bosch P7100 injection pump. This OEM retaining nut secures the injection pump gear to the P-pump shaft and is critical for maintaining proper injection pump timing and reliable engine operation.
During injection pump service, timing adjustments, pump swaps, or front cover repairs, replacing worn or damaged hardware helps ensure proper clamping force and long-term reliability. Genuine Cummins hardware is engineered to meet factory specifications for fitment, thread engagement, and durability.
The Cummins 3920921 gear nut is commonly used during P7100 injection pump installations, AFC upgrades, timing adjustments, and performance fuel system builds.
FEATURES
- Genuine Cummins OEM replacement part
- Fits Bosch P7100 injection pump applications
- Designed for 1994-1998 5.9L Cummins 12V engines
- Secures injection pump gear to P7100 shaft
- Maintains proper pump gear retention and timing integrity
- OEM-quality thread engagement and fitment
- Ideal for pump replacement, timing service, and rebuilds
- Direct-fit OEM replacement design
FITMENT
- 1994 Dodge Ram 2500/3500 5.9L Cummins 12V
- 1995 Dodge Ram 2500/3500 5.9L Cummins 12V
- 1996 Dodge Ram 2500/3500 5.9L Cummins 12V
- 1997 Dodge Ram 2500/3500 5.9L Cummins 12V
- 1998 Dodge Ram 2500/3500 5.9L Cummins 12V
- Fits Bosch P7100 injection pump equipped engines only
WHAT'S INCLUDED
- 1 Cummins 3920921 OEM injection pump gear nut
CROSS-REFERENCE & RELATED PRODUCTS
- CUMMINS 3900250 OEM P7100 INJECTION PUMP KEY
- CUMMINS 3918192 OEM P7100 INJECTION PUMP GEAR
- ARP 247-4203 HEAD STUD KIT
- 12-VALVE CUMMINS FUEL SYSTEM PARTS
- CUMMINS OEM ENGINE PARTS
WHY REPLACE THE P7100 GEAR NUT?
The injection pump gear nut is a critical fastener that helps maintain proper injection timing and gear retention on Bosch P7100-equipped engines. Replacing damaged or fatigued hardware during service helps ensure proper clamping force and long-term reliability in both stock and performance diesel applications.
SPECIFICATIONS
| Specification | Details |
|---|---|
| Manufacturer | Cummins |
| Part Number | 3920921 |
| Application | Bosch P7100 injection pump gear retention |
| Engine Compatibility | 5.9L Cummins 12V |
| Fitment Years | 1994-1998 |
| Pump Type | Bosch P7100 |
| Configuration | OEM retaining nut |
| Condition | New Genuine Cummins OEM Part |
| Prop 65 | Warning: Cancer and Reproductive Harm — www.P65Warnings.ca.gov. |
FAQ
What does the Cummins 3920921 gear nut do?
This nut secures the Bosch P7100 injection pump gear to the injection pump shaft and helps maintain proper injection timing and gear retention.
Will this fit all 5.9L Cummins engines?
No. This part is designed specifically for 1994-1998 12-valve Cummins engines equipped with the Bosch P7100 injection pump.
Should this nut be replaced during injection pump service?
Yes. Replacing critical retaining hardware during injection pump service or timing adjustments is recommended to ensure proper clamping force and reliability.
Is this a genuine Cummins OEM part?
Yes. Cummins 3920921 is a genuine OEM injection pump gear retaining nut designed to factory specifications.
