Product Description
Interstate-McBee M-3922794 Turbo Oil Supply Line O-Ring — 98.5–18 5.9L/6.7L Cummins (Aftermarket Replacement)
High-temperature O-ring used to seal the turbocharger oil supply (feed) line connection on late 1998.5–2018 ISB/6.7L Cummins applications. OE-style dimensions for a proper seal and leak-free service. Sold individually.
- Direct replacement: Matches OE form and fit to replace worn or flattened seals.
- Leak prevention: Restores the seal at the turbo oil feed connection to help protect the turbo.
- Durable: Built from high-temp, oil-resistant elastomer suitable for diesel engine environments.
- Service friendly: Ideal to install any time the feed line is removed.
Specifications
| Brand | Interstate-McBee |
| Part Number | M-3922794 |
| OEM Reference | Cummins 3922794 |
| Location | Turbocharger oil supply (feed) line sealing O-ring |
| Sold As | Each (1 O-ring) |
Vehicle/Engine Fitment
Always verify fitment by engine serial number (ESN) or parts diagram.
- Dodge/Ram 2500 & 3500 with Cummins ISB:
- 5.9L 24-Valve: 1998.5–2007 (model-year split 1998.5)
- 6.7L: 2007.5–2018
- Other B-Series applications where Cummins 3922794 is specified (confirm by ESN).
What’s Included
- (1) Turbo oil supply line O-ring (M-3922794)
Install Notes
- Clean mating surfaces thoroughly; do not scratch the sealing lands.
- Lightly oil the new O-ring before installation; do not use thread sealant on the O-ring.
- Torque fittings/banjo bolts to factory spec. Replace copper washers or other seals as required.
- If the feed line has been disturbed or shows corrosion/kinks, inspect or replace it to avoid future leaks.
Recommended/Related Service Items
- Turbo oil return line gasket/seal (if disturbed)
- Fresh engine oil and filter (if oil contamination is suspected)
- Replacement banjo washers/fittings as applicable
Why Buy From CPP Diesel
- Expert, ESN-based fitment support
- Fast shipping and easy returns
- Quality Interstate-McBee parts for Cummins B-Series
FAQ
How many O-rings are needed?
Typically one is used at the turbo oil supply connection. Some setups may use additional seals at the block/fitting—verify on your engine.
Will this fit both 5.9L and 6.7L?
Yes—this part covers many 5.9L (1998.5–2007) and 6.7L (2007.5–2018) Cummins ISB applications that specify Cummins 3922794. Confirm by ESN or parts diagram.
Material?
High-temperature, oil-resistant elastomer suitable for turbocharger oil feed sealing.
