Product Description
The Cummins 3920922 OEM P7100 Injection Pump Lock Washer is the factory-correct locking washer used to secure the Bosch P7100 (P-pump) injection pump on 1994–1998 5.9L 12-Valve Cummins engines. This washer is essential for maintaining proper torque retention on the pump’s mounting hardware, preventing timing drift, pump misalignment, and fuel delivery inconsistencies. As a genuine Cummins component, the 3920922 washer delivers the precise hardness, thickness, and locking profile required for long-term reliability.
Whether you are replacing a leaking front cover, servicing the P-pump, correcting pump timing, or rebuilding your 12-valve entirely, this lock washer ensures OEM-grade pump security and timing stability.
Fitment
- 1994–1998 Dodge Ram 2500 / 3500 with 5.9L 12-Valve Cummins (Bosch P7100)
- 5.9L 6BT engines equipped with OEM P7100 injection pump mounting hardware
Note: This washer is used in the torque-critical pump mounting stack; replacing used or distorted washers is strongly recommended during pump service.
Cross-Reference (Cummins-Only)
Related 12-Valve Cummins hardware and components:
• Cummins 3903924 OEM Timing Pin – 12-Valve
• Cummins 3900625 OEM Hex Flange Head Cap Screw
• Cummins 3900267 OEM Tappet Cover Bolt Grommet Seal
FAQ
Where is the Cummins 3920922 lock washer used on the P7100 injection pump?
This washer is part of the P-pump mounting hardware that secures the pump to the engine front cover and keeps pump timing stable.
Should this washer be replaced when servicing or removing the injection pump?
Yes. Any distortion, warping, or loss of tension can compromise pump security. Cummins recommends replacing torque-critical hardware.
Does this washer affect injection pump timing?
Indirectly, yes. A proper locking washer prevents pump movement, which protects timing from shifting under vibration or load.
Is this washer compatible with aftermarket P7100 pumps?
Yes — any pump using OEM-style Cummins/Bosch mounting hardware will use this washer.
Specifications for cummins 3920922
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3920922 |
| Component Type | Injection Pump Lock Washer (P7100) |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used across P7100 pump mounting applications (5.9L 12-Valve) |
| E-Codes | N/A |
| Shipping Weight | 0.02 lbs |
| Package Dimensions | 1 x 1 x 1 in |
| Prop 65 Warning | Not Applicable |
