Product Description
The Cummins 3929457 OEM O-Ring Seal is a genuine sealing component used across multiple systems on the 1989–2002 5.9L Cummins 12-Valve and 24-Valve ISB engines. Designed to maintain leak-free performance under high temperature and pressure, this genuine Cummins O-ring provides the correct material composition, diameter, and compression characteristics required for long-term durability. It is commonly used in factory assemblies such as filter housings, coolant pipes, fuel components, and various B-Series sealing locations.
Replacing worn or hardened O-rings with OEM Cummins seals ensures proper fitment and restores factory-level reliability — a critical step during fuel system service, cooling system repairs, and complete engine rebuilds.
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 engines in industrial and off-highway equipment (verify by ESN)
Note: This O-ring is used in multiple locations depending on engine configuration. Verify application by engine serial number (ESN) when necessary.
Cross-Reference (Cummins-Only)
Related Cummins sealing and service components:
• Cummins 3900267 Tappet Cover Bolt Grommet Seal
• Cummins 3904408 Valve Stem Guide – 60.50mm
• Cummins 3904409 Valve Stem Guide – 51.75mm
FAQ
Where is this Cummins 3929457 O-ring used?
This O-ring appears in various fuel, cooling, and engine sealing locations depending on the 5.9L Cummins configuration. ESN verification is recommended.
Is this O-ring suitable for both 12V and 24V engines?
Yes — it is used on 1989–2002 12-Valve and ISB 24-Valve engines where this part number is specified.
Can aftermarket O-rings replace OEM Cummins O-rings?
Aftermarket seals often vary in material composition and tolerance. For critical systems, genuine Cummins O-rings ensure correct fitment and long-term sealing reliability.
Should O-rings be replaced during routine maintenance?
Yes. Anytime a sealed joint is opened — fuel, coolant, or lubrication — Cummins recommends installing a new OEM O-ring to prevent future leaks.
Specifications for cummins 3929457
| Specification | Value |
|---|---|
| Brand | Cummins Genuine Parts |
| Part Number | 3929457 |
| Component Type | O-Ring Seal |
| UPC | Not Published |
| GTIN | Not Published |
| Cross Reference | Used across multiple B-Series sealing points |
| E-Codes | N/A |
| Shipping Weight | 0.01 lbs |
| Package Dimensions | 1 x 1 x 1 in |
| Prop 65 Warning | Not Applicable |
