Product Description
Cummins 3929457 OEM O-Ring Seal – Ram 5.9L (1989–2002)
The Cummins 3929457 OEM O-Ring Seal is a genuine Cummins replacement sealing component designed for use on 1989–2002 Dodge Ram 5.9L Cummins diesel engines. Manufactured to Cummins OEM specifications, this O-ring provides the proper material composition, sealing characteristics, and durability required to maintain leak-free operation in critical engine, fuel, oil, and cooling system applications.
Replacing worn, flattened, or hardened O-rings during maintenance and repairs helps restore factory sealing performance while preventing leaks that can lead to reduced reliability and costly engine damage. Genuine Cummins seals ensure proper fitment and long service life compared to generic aftermarket alternatives.
Features
- Genuine Cummins OEM replacement O-ring seal
- Direct replacement for Cummins part number 3929457
- Designed for long-term sealing performance
- Resists heat, pressure, fuel, oil, and coolant exposure
- Maintains factory sealing integrity
- Helps prevent fluid leaks and pressure loss
- Ideal for maintenance, repairs, and engine rebuilds
- OEM-quality fit and durability
Fitment
- 1989–1993 Dodge Ram 2500/3500 5.9L 12-Valve Cummins
- 1994–1998 Dodge Ram 2500/3500 5.9L 12-Valve Cummins
- 1998.5–2002 Dodge Ram 2500/3500 5.9L 24-Valve ISB Cummins
- Cummins B-Series 5.9L diesel engines
- Select industrial and off-highway Cummins B-Series applications (verify by ESN)
Note: Cummins 3929457 is utilized in multiple sealing locations depending on engine configuration. Always verify application by engine serial number (ESN) before ordering.
What's Included
- (1) Genuine Cummins 3929457 O-Ring Seal
Specifications
- Manufacturer: Cummins Genuine Parts
- Part Number: 3929457
- Component Type: O-Ring Seal
- Material: OEM Cummins Seal Material
- Application: Engine, Fuel, Oil, and Cooling System Sealing
- Engine Family: Cummins B-Series and ISB
- Fitment Range: 1989–2002 Ram 5.9L Cummins
- Condition: New Genuine OEM Cummins Part
Cross Reference Numbers
3929457, M3929457, M-3929457, K3929457, 72116
FAQ
Where is Cummins 3929457 used?
This O-ring is used in multiple sealing locations across Cummins B-Series and ISB engines, including various fuel, cooling, and oil system applications depending on engine configuration. ESN verification is recommended.
Will this fit both 12-valve and 24-valve Cummins engines?
Yes. Cummins 3929457 is commonly used on both 1989–1998 12-valve engines and 1998.5–2002 24-valve ISB engines where this part number is specified.
Why use a genuine Cummins O-ring instead of a generic replacement?
OEM Cummins seals are manufactured to the correct dimensions, material specifications, and compression characteristics required for proper sealing performance and long-term durability.
Should O-rings be replaced during maintenance?
Yes. Whenever a sealed component is removed or serviced, installing a new O-ring helps prevent future leaks and ensures reliable sealing performance.
Can a damaged O-ring cause leaks?
Yes. Hardened, flattened, cut, or deteriorated O-rings can allow oil, coolant, fuel, or air leaks that may affect engine performance and reliability.
