Product Description
Cummins 3920922 OEM P7100 Injection Pump Lock Washer – Ram 5.9L 12-Valve (1994–1998)
The Cummins 3920922 OEM P7100 Injection Pump Lock Washer is the factory-correct locking washer designed for use with the Bosch P7100 injection pump found on 1994–1998 Dodge Ram 5.9L 12-Valve Cummins engines. Installed beneath the P-pump gear nut, this critical hardware component helps maintain proper clamping force, preventing loosening from engine vibration and protecting injection pump timing stability.
Whether you're replacing a worn lock washer during a P7100 pump service, performing a timing adjustment, rebuilding a 12-valve Cummins engine, or replacing the injection pump entirely, the genuine Cummins 3920922 provides the proper fit, hardness, and locking characteristics required for long-term reliability. Using fresh OEM hardware helps ensure secure pump retention and consistent fuel delivery performance.
Features
- Genuine Cummins OEM component
- Direct replacement for factory P7100 injection pump lock washer
- Installs beneath the P7100 pump gear nut
- Helps maintain proper torque retention
- Protects against timing drift caused by vibration
- Supports secure injection pump mounting
- Manufactured to Cummins OEM specifications
- Ideal for pump replacement, timing adjustments, and engine rebuilds
- Designed for long-term durability and reliability
Fitment
- 1994 Dodge Ram 2500 5.9L Cummins 12-Valve
- 1994 Dodge Ram 3500 5.9L Cummins 12-Valve
- 1995 Dodge Ram 2500 5.9L Cummins 12-Valve
- 1995 Dodge Ram 3500 5.9L Cummins 12-Valve
- 1996 Dodge Ram 2500 5.9L Cummins 12-Valve
- 1996 Dodge Ram 3500 5.9L Cummins 12-Valve
- 1997 Dodge Ram 2500 5.9L Cummins 12-Valve
- 1997 Dodge Ram 3500 5.9L Cummins 12-Valve
- 1998 Dodge Ram 2500 5.9L Cummins 12-Valve
- 1998 Dodge Ram 3500 5.9L Cummins 12-Valve
- 5.9L 6BT engines equipped with Bosch P7100 injection pumps
Note: Cummins recommends replacing distorted, damaged, or previously used torque-retention hardware whenever the injection pump or pump gear assembly is serviced.
What's Included
- One (1) Genuine Cummins 3920922 P7100 Injection Pump Lock Washer
Specifications
- Manufacturer: Cummins
- Part Number: 3920922
- Component Type: Injection Pump Lock Washer
- Application: Bosch P7100 Injection Pump
- Installation Location: Beneath Injection Pump Gear Nut
- Engine Compatibility: 5.9L 12-Valve Cummins (6BT)
- Fuel System: Bosch P7100 Mechanical Injection Pump
- Material: OEM Hardened Steel
- Condition: New Genuine Cummins Part
- UPC: Not Published by Manufacturer
- GTIN: Not Published by Manufacturer
Cross Reference Numbers
3920922, Cummins 3920922, P7100 Lock Washer, Bosch P7100 Lock Washer, P-Pump Lock Washer, Injection Pump Gear Nut Washer
FAQ
Where is the Cummins 3920922 lock washer used?
The 3920922 lock washer installs beneath the P7100 injection pump gear nut and helps maintain proper clamping force on the injection pump assembly.
Should I replace the lock washer when removing the injection pump?
Yes. Replacing lock washers during pump removal, timing adjustments, or engine rebuilds is recommended to ensure proper locking force and long-term reliability.
Does this washer affect injection pump timing?
Indirectly, yes. A properly functioning lock washer helps prevent movement of the injection pump hardware, which protects timing stability under vibration and load.
Will this fit aftermarket P7100 injection pumps?
Yes. Most aftermarket P7100 pumps that utilize OEM-style Cummins and Bosch mounting hardware can use this lock washer. Verify hardware requirements before installation.
Is this a genuine Cummins part?
Yes. Part number 3920922 is a genuine Cummins OEM lock washer manufactured to factory specifications for fit, function, and durability.
