Product Description
Cummins 3864458 — Engine Oil Cooler Gasket (Cooler → Filter Head)
MPN: 3864458 | Also Known As: filter head gasket, oil cooler to filter head gasket | Position: Seals the joint between the engine oil cooler core and the oil filter housing
Why This Part
- ✓ OE seal for the cooler-to-filter head interface on 5.9L ISB.
- ✓ Stops leaks and restores oil pressure path after service.
- ✓ Direct-fit for 2003–2007 Ram 5.9L (verify by VIN/ESN).
- ✓ Install-friendly design—no trimming or guesswork.
Quick Specs
| Type | Engine oil cooler gasket — cooler → oil filter head |
|---|---|
| OE Part # | 3864458 |
| Qty Required | 1 (replace any time the filter head is removed) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
Industrial/Off-Highway: Also used on select Tier 3 ISB/QSB applications—verify by ESN before ordering.
Often Paired With
- Oil Cooler to Block Gasket (5.9L ’03–’07): 4895742
- 6.7L Gasket Set (if upgrading or mixing parts): 3974127 (cooler→filter), 2830559 (cooler→block)
- Oil Cooler Core: 3959031 (5.9L) or 3975818 (6.7L)
- Fresh oil & filter after reassembly to remove contaminants
What’s In The Box
- (1) Genuine Cummins Oil Cooler to Filter Head Gasket (3864458)
Install Tips
- Clean both sealing surfaces; remove all old material.
- Install gasket dry unless Cummins procedure specifies otherwise.
- Torque fasteners to spec and recheck for leaks on warm-up.
FAQ
WILL THIS FIT MY 2003–2007 5.9L CUMMINS RAM?Yes—this is the OE cooler-to-filter head gasket for 2003–2007 5.9L ISB Ram 2500/3500 (verify by VIN/ESN).
IS THIS THE GASKET BETWEEN THE OIL COOLER AND OIL FILTER HOUSING?Correct—3864458 seals the joint from the oil cooler core to the oil filter head/housing.
DO I ALSO NEED THE BLOCK GASKET (4895742)?It’s recommended any time the cooler is serviced. 4895742 seals the cooler core to the engine block on 5.9L (’03–’07).
WILL THIS WORK ON 6.7L TRUCKS?6.7L Rams typically use gasket 3974127 at the cooler→filter head joint; use 2830559 at the cooler→block.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3864458 for proper fit and sealing performance.
