Product Description
CUMMINS 3945268 OEM CRANKCASE BREATHER HOSE – RAM 5.9L (1998.5–2002)
The genuine CUMMINS 3945268 crankcase breather hose is the direct OEM replacement for 1998.5–2002 5.9L ISB Cummins engines. This hose connects the cylinder block breather assembly to the ventilation outlet, allowing blow-by gases to escape the crankcase safely and preventing excessive crankcase pressure. A hardened, brittle, or leaking breather hose can lead to oil mist leaks, underhood mess, and elevated crankcase pressure—all of which can affect engine seals and long-term reliability.
This Cummins-engineered hose maintains the correct diameter, flexibility, routing, and oil-resistant construction required for dependable ventilation system performance. If you're experiencing oil residue around the breather, fumes, or visible hose cracking, replacing the hose with a true OEM Cummins component ensures long-term durability and proper crankcase function.
Key Features
- Genuine Cummins OEM breather hose – proper fit, length, and oil-resistant material.
- Designed for 5.9L ISB (1998.5–2002) crankcase ventilation systems.
- Prevents crankcase pressure buildup and reduces oil mist discharge.
- Restores factory routing for clean and reliable underhood ventilation.
- Long-life OEM rubber compound resists hardening and cracking.
Fitment Details
- Engine: Cummins 5.9L ISB 24-Valve
- Years: 1998.5–2002
- Applications: Dodge/Ram 2500 & 3500
- Notes: Verify by VIN/ESN, especially for mid-year changes in the 1998.5 transition.
Cross-Reference & Companion Cummins Parts
This part works in conjunction with other crankcase ventilation and gasket components. View additional genuine Cummins parts available at CPP Diesel:
Common Cummins cross-reference numbers: 3945268, 3945268NX (verify by VIN/ESN).
Installation Notes
- Inspect breather canister and fittings before installation.
- Replace hose clamps if they show signs of corrosion or fatigue.
- Ensure proper routing away from hot exhaust surfaces.
- Check for crankcase pressure issues after installation if symptoms persist.
Specifications for cummins 3945268
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3945268 |
| Alternate / Superseded Numbers | 3945268NX |
| Function | Crankcase breather hose (ventilation system) |
| Engine Compatibility | 5.9L Cummins ISB 24-Valve (1998.5–2002) |
| Vehicle Fitment | Dodge/Ram 2500 & 3500 (1998.5–2002) |
| UPC | 190910285294 |
| GTIN | 190910285294 |
| Shipping Weight | Approx. 0.35 lbs |
| Shipping Method | Standard ground; expedited available |
| E-Codes / Emissions | Non-emissions-critical crankcase ventilation 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
WHAT SYMPTOMS INDICATE MY BREATHER HOSE NEEDS REPLACEMENT?
Common signs include oil mist around the hose, cracking, brittleness, or excessive fumes escaping from the crankcase ventilation outlet.
WILL THIS FIT MY 1998.5–2002 5.9L CUMMINS?
Yes, this hose fits the 24-valve ISB engine used from 1998.5–2002. Always verify by VIN/ESN to confirm compatibility.
SHOULD I REPLACE THE BREATHER ASSEMBLY TOO?
If the breather canister or grommet shows wear, replacing them along with the hose is recommended for best results. Click “View All Cummins Parts” above to browse compatible components.
IS THIS A GENUINE CUMMINS PART?
Yes — CPP Diesel supplies only authentic Cummins OEM components for proper fit, material quality, and long-term durability.
