Product Description
Cummins 4940183 — Genuine Turbo Oil Supply Fitting (Male Union) With O-Ring
MPN: 4940183 | Also Known As: turbo oil inlet fitting, oil feed union, male connector | Includes: O-ring (1)
Genuine Cummins male union for the turbocharger oil feed/inlet connection on 5.9L & 6.7L ISB platforms. Restores a leak-free seal and proper oil flow to the turbo. Direct-fit OEM quality; commonly used at the turbo inlet and/or on the feed line depending on application. Sold individually.
Features & Benefits
- OE sealing with included O-ring for drip-free installation.
- Correct geometry for Ram 5.9L & 6.7L ISB turbo oil feed locations.
- Prevents oil starvation at the turbocharger by restoring proper flow.
- Durable construction to handle heat, vibration, and pressure.
- Genuine Cummins component—no guesswork on fitment.
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1998.5–2002 | Ram 5.9L ISB (24V VP44) | Ram 2500/3500 |
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
| 2007.5–2024 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Industrial/Off-Highway: Used widely on ISB6.7/QSB6.7 EPA13+—verify by ESN before ordering.
Compatibility Notes:
- Commonly referenced as a turbo oil inlet/feed fitting (male union) for 5.9L & 6.7L. Some vehicles may use more than one union in the feed circuit—sold individually.
- Includes O-ring. If your line or turbo has been serviced, inspect mating surfaces and consider replacing the oil feed line at the same time.
Specifications
- Type: Male union (turbo oil feed / inlet fitting)
- OE Part Number: 4940183
- Sealing: O-ring included
- Quantity Required: 1 per oil-feed connection point (varies by application)
Often Paired With
- Turbo oil feed line: Cummins 4935577 (’03–’18 typical; verify by VIN/ESN)
- Fresh oil & filter: after any turbo oil-line service
What’s In The Box
- (1) Genuine Cummins Male Union / Turbo Oil Inlet Fitting (4940183)
- (1) O-ring
Installation Tips
- Clean mating bores and lightly lube the O-ring before installation.
- Inspect the oil feed line for kinks, cracks, or restrictions; replace if questionable.
- Torque to factory spec and check for leaks after initial heat cycle.
FAQ
WILL THIS FIT MY 5.9L OR 6.7L CUMMINS RAM?
Yes—this male union fitting is used on Ram 5.9L (1998.5–2007) and 6.7L (2007.5–2024) applications; confirm by VIN/ESN if unsure.
IS THE O-RING INCLUDED?
Yes—this fitting ships with the O-ring for a proper seal at installation.
HOW MANY FITTINGS DO I NEED?
Most trucks need one at the turbo oil inlet; some applications use an additional union on the feed line. Sold individually—check your layout.
WHAT DOES THIS FITTING DO?
It connects the turbo oil feed line and provides a sealed passage to deliver pressurized oil to the turbocharger.
IS THIS A GENUINE CUMMINS PART?
Yes—4940183 is an OEM Cummins component for correct fit and durability.
