Product Description
The CUMMINS 3949688 OEM RECTANGULAR RING SEAL is designed for CP3 injection pump to gear housing sealing applications on 2003–2018 5.9L and 6.7L Cummins diesel engines. This genuine Cummins seal helps maintain a proper seal between the CP3 injection pump and front gear housing to prevent fuel and oil leaks while ensuring reliable fuel system operation.
Use this seal whenever removing or installing a CP3 injection pump, performing fuel system repairs, or servicing the front gear housing area. Always verify fitment by engine serial number and part number before ordering.
FEATURES
- Genuine Cummins OEM rectangular ring seal
- Designed for CP3 injection pump to gear housing applications
- Helps prevent leaks and contamination
- Direct-fit replacement sealing component
- Maintains proper sealing integrity during fuel system service
- Recommended whenever the CP3 pump is removed or replaced
FITMENT
- 2003–2007 Dodge Ram 2500/3500 5.9L Cummins Common Rail
- 2007.5–2018 Ram 2500/3500 6.7L Cummins
- Select Cummins ISB industrial and commercial applications utilizing a CP3 injection pump
WHAT'S INCLUDED
- 1 Cummins 3949688 OEM Rectangular Ring Seal
CROSS-REFERENCE AND RELATED PRODUCTS
- Cummins 3949688
- CP3 Injection Pump Mounting Components
- CP3 Injection Pump Gaskets and Seals
- Cummins Fuel System Service Parts
SPECIFICATIONS
- Manufacturer: Cummins
- Part Number: 3949688
- Part Type: Rectangular Ring Seal
- Application: CP3 Injection Pump to Gear Housing
- Engine Compatibility: 5.9L Cummins, 6.7L Cummins
- Fitment Years: 2003–2018
- Vehicle Application: Dodge Ram / Ram 2500 and 3500
- Condition: New OEM Cummins
- Installation Type: Direct Replacement
FAQ
Will this seal fit my truck?
This seal fits many 2003–2018 5.9L and 6.7L Cummins applications equipped with a CP3 injection pump. Always verify fitment using your engine serial number and part number before ordering.
Is this a genuine Cummins seal?
Yes. Cummins 3949688 is a genuine OEM Cummins sealing component manufactured to factory specifications.
When should this seal be replaced?
This seal should be replaced whenever the CP3 injection pump is removed, replaced, or serviced to help prevent leaks and ensure proper sealing.
What does this seal do?
The rectangular ring seal creates a seal between the CP3 injection pump and the gear housing to help prevent fluid leakage and contamination.
Can I reuse my old seal?
Reusing old seals is not recommended. Installing a new OEM seal during service helps ensure proper sealing and long-term reliability.
Do I need any related parts?
Inspect the CP3 mounting hardware, pump gasket surfaces, fuel lines, and related sealing components during installation and replace worn parts as necessary.
