Product Description
Cummins 3912747 — Turbocharger Oil Feed Line (Flexible Hose)
MPN: 3912747 | Also Known As: turbo oil supply line, flexible hose | Typical Use: 5.9L 12-valve turbo oil feed
Why This Part
- ✓ OE hose to restore reliable turbo oil supply on 12-valve 5.9L.
- ✓ Direct-fit replacement for first/second-gen Ram 5.9L (1991.5–1998).
- ✓ Resists heat & vibration to prevent leaks at the turbo inlet.
- ✓ Genuine Cummins quality and durability.
Quick Specs
| Type | Turbocharger oil feed line (flexible hose) |
|---|---|
| OE Part # | 3912747 |
| Qty Required | 1 per engine (sold individually) |
| Common Companion Parts | Turbo oil inlet fitting 3919687; connectors/seals kits referenced as 3907453 & 3913824 (verify by VIN/ESN) |
Verified Fitment (Automotive)
| Year Range | Engine | Chassis |
|---|---|---|
| 1991.5–1998 | Ram 5.9L 12-Valve (VE ’91.5–’93; P7100 ’94–’98) | Ram 2500/3500 |
Notes: Cummins identifies 3912747 as a flexible hose used on B-series 5.9 applications; automotive fitment commonly references 1991.5–1998 Ram 5.9L. Verify by VIN/ESN if components have been changed.
Often Paired With
- Turbo Oil Inlet Fitting: Cummins 3919687 (HX35 inlet)
- Turbo Oil Drain Hose: 3286499 & Clamp: 3937613
- Penetrating fluid for removing rusted original line; fresh oil & filter after repair
What’s In The Box
- (1) Genuine Cummins Turbo Oil Feed Line (3912747)
- Fittings/seals sold separately (see “Often Paired With”).
Install Tips
- Pre-soak old fittings with penetrating oil; avoid twisting the hard fittings at the turbo.
- Inspect/clean oil passages; confirm no kinks and proper routing away from heat.
- Prime oil system and check for leaks on warm-up.
FAQ
WILL THIS FIT MY 1991.5–1998 5.9L 12-VALVE RAM?Yes—this OE hose is commonly listed for first/second-gen 5.9L 12-valve Rams (1991.5–1998). Always verify by VIN/ESN.
WHAT FITTING DOES THE LINE THREAD TO AT THE TURBO?Most HX35 setups use Cummins oil inlet fitting 3919687 at the turbo. Replace it if corroded or damaged.
ARE SEALS/CONNECTORS INCLUDED?No—order fittings/seals separately. Common references include 3907453 and 3913824 kits; verify by VIN/ESN.
IS THIS A GENUINE CUMMINS PART?Yes—OE Cummins 3912747 for proper fit and durability.
DO I NEED TO REPLACE THE DRAIN HOSE TOO?It’s a good idea if it’s brittle or leaking. Common replacements include 3286499 (hose) and 3937613 (clamp).
