Product Description
Cummins 3944797 — Crankcase Breather With Integrated Oil Fill
MPN: 3944797 | Also Known As: breather assembly, CCV breather, oil fill breather | Function: Vents crankcase pressure and provides a factory oil-fill point
Why This Part
- ✓ OE ventilation to control crankcase pressure and reduce oil carryover.
- ✓ Integrated oil-fill for fast, clean top-offs—no spills.
- ✓ Direct-fit for 1989–2002 5.9L Cummins Ram (12V & 24V).
- ✓ Genuine Cummins casting and hardware for long service life.
Quick Specs
| Type | Crankcase breather with integrated oil-fill |
|---|---|
| OE Part # | 3944797 |
| Qty Required | 1 per engine (sold individually) |
| Use Case | Restores proper crankcase ventilation and factory oil-fill location |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–1998 | 5.9L Cummins 12-Valve (6BT) | Ram 2500/3500 |
| 1998.5–2002 | 5.9L Cummins 24-Valve (ISB/VP44) | Ram 2500/3500 |
Industrial/Off-Highway: Seen on 4B/6B/ISB applications—verify by ESN for non-automotive equipment.
Often Paired With
- Breather/CCV hose and clamps (inspect/replace if brittle)
- Valve cover gasket (if the cover is removed during service)
- Fresh oil & filter after any major engine service
What’s In The Box
- (1) Genuine Cummins Crankcase Breather Assembly with Oil-Fill (3944797)
- Gaskets/hardware sold separately (verify by VIN/ESN)
Install Tips
- Clean mating surfaces and replace any seals/gaskets disturbed during removal.
- Verify breather hose routing; check for kinks or blockages.
- After install, monitor for leaks and confirm proper crankcase ventilation.
FAQ
WILL THIS FIT MY 1989–2002 5.9L CUMMINS RAM?Yes—this breather with oil-fill is used across 1989–1998 12V and 1998.5–2002 24V 5.9L Ram applications (verify by VIN/ESN).
WHAT DOES THE CRANKCASE BREATHER DO?It vents excess crankcase pressure to reduce leaks and oil carryover while maintaining proper engine performance.
DOES THIS INCLUDE THE OIL-FILL OPENING?Yes—3944797 features an integrated oil-fill hole in the breather housing for quick, clean top-offs.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3944797 built to factory specifications for fit and durability.
WHAT ABOUT INDUSTRIAL ENGINES?It appears on several 4B/6B/ISB industrial variants. Always confirm by ESN for non-automotive equipment.
