Product Description
Cummins 3934084 — Flexible Turbocharger Oil Drain Tube (Approx. 21" Overall Length)
MPN: 3934084 | Also Known As: turbo oil drain connection, turbo oil return line, drain tube | Length: ~21"
Why This Part
- ✓ OE flexible return for proper turbo oil drainage back to the crankcase.
- ✓ Direct-fit on common ISB B-Series applications; flexible design aids alignment.
- ✓ Durable construction to resist heat, vibration, and collapse.
- ✓ Helps prevent oil leaks & turbo seal stress due to poor drain routing.
Quick Specs
| Type | Turbocharger oil drain/return tube (flexible) |
|---|---|
| OE Part # | 3934084 |
| Length | ~21" overall (routing dependent) |
| Qty Required | 1 per engine (sold individually) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1989–2002 | Ram 5.9L Cummins (12V & 24V) | Ram 2500/3500 |
| 2003–2007 | Ram 5.9L ISB (24V Common-Rail) | Ram 2500/3500 |
| 2007.5–2018 | Ram 6.7L ISB (24V Common-Rail) | Ram 2500/3500 |
Notes: This flexible drain is widely used across ISB 5.9/6.7 applications and B-Series variants. Always verify by VIN/ESN, turbo/center-housing drain orientation, and required length.
Often Paired With
- Turbo drain O-ring seals (2) — turbo end & block/drain flange (sold separately; verify by ESN)
- Turbo oil feed line gaskets/seals (as needed)
- Fresh oil & filter if contamination was present
What’s In The Box
- (1) Genuine Cummins Flexible Turbo Oil Drain Tube (3934084)
- Seals/hardware sold separately (see “Often Paired With”).
Install Tips
- Maintain a continuous downhill slope to the crankcase; avoid sags/kinks.
- Use new O-rings; lightly oil seals; torque fasteners to factory spec.
- After heat-cycle, recheck for oil seepage and hose/fitting clearance.
FAQ
WILL THIS FIT MY 5.9L OR 6.7L CUMMINS RAM?Common across 1989–2018 Ram 2500/3500 5.9L & 6.7L applications; verify by VIN/ESN and the 21" routing requirement.
WHAT IS THE OVERALL LENGTH?Approximately 21" overall length. Confirm your routing and orientation before ordering.
ARE O-RINGS INCLUDED?Not typically—seals are sold separately and can vary by engine build. Replace both ends during service.
WILL THIS WORK WITH AFTERMARKET OR REPLACEMENT TURBOS?Yes, if the drain flange/adapter and orientation match OE spec. Some turbos require different adapters or lengths.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3934084 with proper materials and bend profile for durability.
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Product Reviews
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Save me a all of heart ache .
Upgraded my turbo to a BD and the old down pipe would not fit between the Wastegate and turbo . This one did the job with no problems.
