Product Description
Restore proper oil delivery to your turbocharger with the genuine Cummins 4940183 OEM turbo oil supply fitting (male union) with O-ring. This direct-fit union is designed for the 5.9L and 6.7L ISB Cummins engine families, and ensures a factory-correct seal at the turbo oil feed line, preventing leaks, turbo oil starvation, and reliability issues.
Don’t rely on inferior generic fittings — the Cummins 4940183 male union ensures correct thread engagement, material grade, and sealing geometry for the turbo oil feed circuit. Whether you’re maintaining a stock turbo on a 5.9L or running a 6.7L ISB on EPA13+ duty cycles, this OEM fitting gives you the confidence of genuine Cummins engineering.
Key Features & Benefits
- Genuine Cummins 4940183 OEM part – not aftermarket.
- Male union fitting with O-ring included for a leak-free seal.
- Restores factory turbo oil feed connection on 5.9L & 6.7L ISB engines.
- Handles high oil pressure, high temperature, and vibration in turbo circuits.
- Direct-fit installation – minimal adaptation required.
Fitment Information
This OEM fitting is engineered for the following applications:
- 1998.5-2002 Dodge Ram 5.9L ISB (24V VP44) – turbo oil feed union.
- 2003-2007 Dodge Ram 5.9L ISB (24V common-rail) – turbo oil feed union.
- 2007.5-2024 Dodge Ram 6.7L ISB (24V common-rail) – turbo oil feed union.
Quantity required: Typically 1 per turbo inlet/feed connection—some applications may require more based on oil feed system layout.
When To Replace This Fitting
- You note an oil leak at the turbo inlet/union connection point.
- The union is damaged, corroded, or has a missing or worn O-ring.
- You are servicing the turbo oil feed line or turbocharger and restoring all seals.
- Aftermarket turbo installation where the OEM union is missing or cut off.
Specifications for cummins 4940183
| Specification | Detail |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Part Number | 4940183 |
| Application | Dodge Ram 5.9L & 6.7L ISB turbo oil supply / feed circuit |
| Seal Type | O-ring included |
| Compatible Engines | 5.9L ISB (1998.5-2007) & 6.7L ISB (2007.5-2024) |
| GTIN | Not specified / not publicly available |
| UPC | Not specified / not publicly available |
| Shipping Weight | Approx. 0.1 lb (as per Cummins listing) |
| Shipping Dimensions (L × W × H) | Approx. 1.5 in × 1.5 in × 0.8 in |
| Cross Reference (ID Only) | Cummins 4940183 (this part). |
| E-Codes / Emissions | Not specified; OE sealing-fitting in turbo oil circuit |
| Prop 65 Warning | Yes – This product can expose you to chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. For more info go to www.P65Warnings.ca.gov |
FAQ
WILL THIS CUMMINS 4940183 FIT MY RAM WITH A 5.9L OR 6.7L CUMMINS?
Yes — the Cummins 4940183 male union turbo oil supply fitting is used on 5.9L ISB (1998.5-2007) and 6.7L ISB (2007.5-2024) Ram trucks. Confirm by VIN or ESN before ordering.
WHAT DOES THIS FITTING DO ON MY TURBO’S OIL FEED LINE?
This fitting threads into the turbo oil inlet (or the feed line union) and seals the high-pressure oil supply with an O-ring, ensuring proper oil flow to the turbocharger and preventing leaks or oil starvation.
IS THE O-RING INCLUDED WITH THIS PART?
Yes — the genuine Cummins 4940183 part includes the required O-ring for proper sealing at installation.
HOW MANY OF THESE FITTINGS DO I NEED WHEN SERVICING MY TURBO OIL LINE?
Most trucks will only require one union fitting at the turbo oil inlet. Some applications may have a second union further upstream — inspect your feed line layout before ordering as each union is sold individually.
WHY CHOOSE GENUINE CUMMINS RATHER THAN AN AFTERMARKET FITTING?
A genuine Cummins part ensures correct thread pitch, material specification, sealing geometry, and quality control — all of which are critical in the high-temperature, high-pressure environment of the turbo oil feed circuit. Aftermarket fittings may fit physically but often lack the same level of sealing and durability.
