Product Description
Cummins 3974127 — Oil Cooler-to-Filter Head Gasket (6.7L)
MPN: 3974127 | Also Known As: oil cooler gasket, filter head gasket, cooler-to-filter head gasket | Location: Seals the oil cooler core to the oil filter housing
Why This Part
- ✓ OE sealing between the cooler core and filter head to prevent leaks & pressure loss.
- ✓ Direct-fit for Ram 6.7L ISB applications (2007.5+).
- ✓ Restores oil system integrity after service or housing removal.
- ✓ Single-use gasket—replace anytime the joint is opened.
Quick Specs
| Type | Oil cooler-to-filter head gasket |
|---|---|
| OE Part # | 3974127 |
| Qty Required | 1 per service (sold individually) |
| Mating Components | Oil cooler core (3975818) & oil filter housing (5289557) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 2007.5–2024 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Notes: Also used across many industrial ISB/QSB 6.7 applications; always verify by VIN/ESN. 5.9L CR (’03–’07) uses different gaskets (3864458/4895742).
Often Paired With
- Oil Cooler Core (6.7L): 3975818
- Oil Cooler-to-Block Gasket (6.7L): 2830559
- Oil Filter Housing / Filter Head: 5289557
- For 5.9L (’03–’07) gaskets: 3864458 (cooler→filter), 4895742 (cooler→block)
What’s In The Box
- (1) Genuine Cummins Oil Cooler-to-Filter Head Gasket (3974127)
- Other gaskets & hardware sold separately (see “Often Paired With”).
Install Tips
- Clean mating surfaces; do not reuse old gaskets.
- Align carefully and torque per factory spec to ensure a uniform seal.
- Prime and check for leaks after warm-up; change oil & filter if contamination was present.
FAQ
WILL THIS FIT MY 2007.5–2024 6.7L CUMMINS RAM?Yes—this gasket is the OE seal between the oil cooler and filter head for most 6.7L ISB Ram applications (verify by VIN/ESN).
IS THIS THE COOLER-TO-FILTER HEAD GASKET OR THE BLOCK GASKET?This is the cooler-to-filter head gasket. The cooler-to-block gasket for 6.7L is part 2830559.
DOES THIS COME WITH OTHER GASKETS?No—this listing is for a single gasket (3974127). If servicing the assembly, add 2830559 (block) and inspect 5289557 (filter head) and 3975818 (cooler).
WILL THIS FIT 5.9L TRUCKS?No—5.9L CR (’03–’07) uses different gaskets (3864458 & 4895742).
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3974127 for accurate sealing and durability.
