Product Description
Cummins 3909355 — Engine Oil Filter Head Adapter
MPN: 3909355 | Also Known As: filter head adapter, oil filter adapter ring | Role: Interfaces the oil cooler core and the oil filter housing
Why This Part
- ✓ OE adapter that ensures the oil cooler and filter head seal and align correctly.
- ✓ Direct-fit on Ram 5.9L/6.7L ISB platforms in the listed year ranges (see fitment).
- ✓ Prevents leaks and pressure loss caused by damaged or missing adapters.
- ✓ OE casting and finish for durability and long service life.
Quick Specs
| Type | Engine oil filter head adapter (cooler-to-filter interface) |
|---|---|
| OE Part # | 3909355 |
| Qty Required | 1 per engine (sold individually) |
| Mating Components | Oil cooler core & oil filter housing (see “Often Paired With”) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
| 2007.5–2011 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Notes: XDP lists this adapter for “2003–2011 Dodge with 5.9L/6.7L Cummins” (we split the range for clarity). Earlier 1989–2002 and later 2012–2018 applications may use different adapters/filter heads—always verify by VIN/ESN and by the filter housing casting number.
Often Paired With
- Oil Filter Housing (5.9L 12V ’94–’98): 3918954
- Oil Filter Housing (5.9L 24V ’98.5–’02): 3934303
- Oil Filter Housing (ISB ’03–’18): 5289557
- Oil Cooler Cores: 3959031 (5.9L ’03–’07) · 3975818 (6.7L ’07.5+)
- Gaskets/Seals: 3864458 & 4895742 (5.9L) · 3974127 & 2830559 (6.7L)
What’s In The Box
- (1) Genuine Cummins Oil Filter Head Adapter (3909355)
- Gaskets & hardware sold separately (see “Often Paired With”).
Install Tips
- Clean mating surfaces; replace seals; torque to factory spec.
- Inspect cooler and filter head for damage or warping before reassembly.
- Prime and check for leaks on warm-up; change oil & filter if contamination was present.
FAQ
WILL THIS FIT MY 2003–2011 5.9L/6.7L CUMMINS RAM?Yes—this adapter is listed for 2003–2011 Ram 2500/3500 with 5.9L/6.7L ISB. We show separate rows for 5.9 (’03–’07) and 6.7 (’07.5–’11) for clarity. Always confirm by VIN/ESN.
WHAT DOES THIS ADAPTER DO?It’s the OE interface between the oil cooler core and the oil filter housing, ensuring proper alignment and sealing.
WHICH FILTER HOUSING DOES MY TRUCK USE?Common housings are 3918954 (’94–’98 12V), 3934303 (’98.5–’02 24V), and 5289557 (’03–’18 ISB). Match by VIN/ESN and casting.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3909355 with factory geometry and finish.
DO I NEED NEW GASKETS?Yes—replace mating gaskets/seals when the adapter is removed. See the part numbers listed above.
