Product Description
CUMMINS 3957203 OEM VALVE COVER BOLT WITH GROMMET (CAPTIVE ISOLATOR CAP SCREW) – RAM 5.9L (2004.5–2005)
The genuine CUMMINS 3957203 valve cover bolt with grommet is the exact OEM fastener used on 2004.5–2005 Ram 5.9L Cummins ISB engines to secure and seal the valve cover. This bolt features a captive rubber isolator that prevents oil leaks, reduces vibration, and ensures correct clamping force across the valve cover. If you are experiencing seepage around the valve cover, broken bolts, or deteriorated grommets, replacing worn hardware with authentic Cummins components restores factory sealing and reliability.
Many high-mileage 5.9L engines develop valve cover leaks not from the gasket itself, but from hardened or compressed bolt grommets. This OE Cummins bolt includes the proper bonded rubber isolator to maintain even pressure and prevent warping. Perfect for reseals, top-end service, or complete valve cover refreshes.
Key Features
- Genuine Cummins OEM hardware – exact fit, material, and isolator durometer.
- Integrated bonded grommet maintains valve cover sealing pressure.
- Prevents oil leaks caused by worn or flattened isolator bushings.
- Direct replacement for 2004.5–2005 5.9L ISB valve cover bolts.
- Restores factory NVH control by using the correct Cummins-isolated fastener.
Fitment Details
- Engine: 5.9L Cummins ISB (Common Rail)
- Years: 2004.5–2005 (high-pressure common rail)
- Applications: Dodge Ram 2500 / 3500
- Notes: Uses multiple bolts per valve cover; replace as a full set when possible.
Cross-Reference & Companion Cummins Parts
Complete your valve cover service with these matching Cummins OEM parts available at CPP Diesel:
- CUMMINS 3957912 VALVE COVER GASKET – recommended anytime the valve cover is removed.
- CUMMINS 5264950 CRANKCASE BREATHER FILTER – often replaced during top-end service.
- CUMMINS 3969988 VALVE COVER OIL DEFLECTOR – ensures proper internal airflow and oil control.
- VIEW ALL GENUINE CUMMINS OEM PARTS
Cummins cross-reference numbers include: 3957203, 3957203NX (verify by VIN/ESN).
Installation Notes
- Replace all valve cover bolts as a set for consistent sealing pressure.
- Inspect the valve cover gasket for brittleness or compression damage.
- Do not overtighten – the isolator is designed to compress to a specific load.
- Torque to factory specs and recheck after the first heat cycle.
Specifications for cummins 3957203
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3957203 |
| Function | Valve cover bolt with bonded rubber isolator/grommet |
| Engine Compatibility | 5.9L Cummins ISB (Common Rail) |
| Vehicle Fitment | 2004.5–2005 Dodge Ram 2500 / 3500 |
| UPC | 190910246050 |
| GTIN | 190910246050 |
| Shipping Weight | Approx. 0.05 lb |
| Shipping Method | Standard ground shipping |
| E-Codes / Emissions | Non-emissions component |
| Prop 65 Warning | WARNING: May expose you to chemicals known to cause cancer and reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by batch) |
Frequently Asked Questions
HOW MANY OF THESE BOLTS DOES MY 5.9L CUMMINS USE?
The valve cover uses multiple bolts; replacing all ensures even sealing pressure and prevents future leaks.
WILL THIS FIT MY 2004.5–2005 COMMON RAIL CUMMINS?
Yes—CUMMINS 3957203 is the correct hardware for most 2004.5–2005 ISB engines. Always verify by VIN/ESN.
SHOULD I REPLACE THE VALVE COVER GASKET AT THE SAME TIME?
It is recommended. Consider using the CUMMINS 3957912 gasket for a complete reseal.
WHAT CAUSES THESE GROMMETS TO FAIL?
Heat cycling and compression wear cause the rubber isolator to harden or flatten, leading to oil seepage.
IS THIS A GENUINE CUMMINS PART?
Yes—this is an authentic Cummins OEM bolt with the proper bonded grommet.
