Product Description
CUMMINS 3909355 OEM ENGINE OIL FILTER HEAD ADAPTER – RAM 5.9L/6.7L (2003–2011)
The genuine CUMMINS 3909355 OEM engine oil filter head adapter is the factory-correct adapter that mounts between the engine block and the oil filter assembly on 2003–2011 Cummins ISB engines. This precision-machined OEM adapter aligns and seals the oil filter head to the block, ensuring proper lubrication routing, filtration pressure, and long-term engine protection.
If your original adapter is cracked, corroded, leaking, or stripped at the sealing surfaces, this genuine Cummins replacement restores the correct oil flow and prevents lubrication loss that can lead to premature engine wear. The 3909355 adapter is engineered specifically for the 5.9L and early 6.7L engines and is built to withstand extreme temperature cycles, chassis vibration, and constant oil pressure.
Key Features
- Genuine Cummins OEM adapter – superior sealing and structural integrity.
- Direct replacement for 2003–2011 ISB 5.9L & 6.7L models.
- Ensures proper oil routing to and from the oil filter head.
- Prevents leaks and oil pressure loss caused by damaged aftermarket adapters.
- Compatible with OEM oil coolers, filter heads, and hardware.
Fitment Details
- Engine: 5.9L Cummins ISB (2003–2007), 6.7L Cummins ISB (2007.5–2011)
- Vehicle Applications: Dodge/Ram 2500 & 3500 trucks
- Notes: Always verify with VIN/ESN due to engine option variances.
Cross-Reference & Companion Cummins Parts
Pair your new 3909355 adapter with these genuine Cummins parts for a complete oil system refresh:
- CUMMINS 3951609 OIL FILTER STANDPIPE – threads into the filter head and holds the oil filter.
- CUMMINS 3929792 OIL FILTER HOUSING GASKET – ensures a leak-free seal when reinstalling the filter head.
- CUMMINS 3949354 OIL PRESSURE SENSOR – mounts to the filter head for OEM-correct oil pressure monitoring.
- VIEW ALL GENUINE CUMMINS PARTS
Common Cummins cross-reference numbers: 3909355, 3908618, 3943860 (verify by VIN/ESN).
Installation Notes
- Clean all block surfaces thoroughly before installation.
- Always replace the filter head gasket when removing the housing.
- Torque mounting hardware to Cummins specifications.
- Prime the lubrication system before restarting the engine.
Specifications for cummins 3909355
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3909355 |
| Alternate Numbers | 3908618, 3943860 (verify by VIN/ESN) |
| Function | Oil filter head adapter / mounting interface |
| Engine Compatibility | 5.9L Cummins ISB (2003–2007), 6.7L Cummins ISB (2007.5–2011) |
| Vehicle Fitment | 2003–2011 Ram 2500/3500 |
| UPC | 190910283889 |
| GTIN | 190910283889 |
| Shipping Weight | Approx. 1.8 lbs |
| Shipping Method | Standard ground; expedited available |
| E-Codes / Emissions | Non-emissions related component |
| Prop 65 Warning | WARNING: May expose you to chemicals known to the State of California to cause cancer and reproductive harm. See www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (varies by batch) |
Frequently Asked Questions
WILL THIS FIT BOTH 5.9L AND 6.7L CUMMINS ENGINES?
Yes—CUMMINS 3909355 is used on most 2003–2011 ISB engines, including 5.9L (2003–2007) and 6.7L (2007.5–2011). Always confirm by VIN/ESN.
SHOULD I REPLACE THE FILTER HEAD GASKET WHEN INSTALLING THIS?
Yes. We recommend replacing the CUMMINS 3929792 gasket to ensure a proper seal and prevent future leaks.
CAN A DAMAGED ADAPTER CAUSE LOW OIL PRESSURE?
Absolutely. Cracks, warped surfaces, or improper sealing at the adapter can cause oil pressure loss and routing issues that affect engine lubrication.
IS THIS A GENUINE CUMMINS PART?
Yes—CPP Diesel supplies only authentic OEM Cummins parts for this component.
WHAT OTHER COMPONENTS SHOULD I INSPECT WHILE SERVICING THIS AREA?
Inspect the standpipe, filter head, gasket, and oil cooler fittings. Replace worn components with genuine Cummins parts for proper system operation.
