Product Description
CUMMINS 3912747 OEM TURBO OIL FEED LINE – RAM 5.9L 12-VALVE (1991.5–1998)
Restore factory-correct turbo oil supply on your first and second gen Ram with the genuine CUMMINS 3912747 OEM turbo oil feed line. This flexible OE hose feeds pressurized engine oil from the filter housing to the turbocharger, protecting your HX35/HX-style turbo from oil starvation, coking, and premature failure. If your original line is rusted, seeping, or kinked, this is the direct-fit Cummins replacement you want on your 5.9L 12-valve.
Built to Cummins specifications for heat, pressure, and vibration resistance, this hose drops into the factory routing on 1991.5–1998 5.9L B-series applications. Pair it with the correct CUMMINS 3919687 turbo oil inlet fitting at the turbo and a healthy drain system using the CUMMINS 3286499 turbo oil drain hose and related hardware for a complete, leak-free OE oil circuit.
Whether you’re installing a new turbocharger or simply refreshing a high-mileage 5.9L 12V, upgrading the oil feed line is cheap insurance against expensive turbo damage and messy oil leaks.
Key Features
- Genuine Cummins OEM turbo oil feed hose – correct length, fittings, and routing.
- Direct-fit for 5.9L 12-valve Ram 2500/3500 (1991.5–1998) when verified by VIN/ESN.
- High-temperature, vibration-resistant construction to survive turbo-area heat and chassis flex.
- Restores reliable turbo lubrication to prevent bearing damage and turbo failures.
- Supports stock and OE-style replacement turbos using the factory oil inlet fitting.
Fitment Details
This genuine Cummins flexible hose is used primarily on non-certified automotive 5.9L B-series engines and is commonly cataloged for the following Ram applications:
- Engine: 5.9L Cummins B-Series 12-Valve (VE & P7100)
- Years (automotive common listing): 1991.5–1998
- Chassis: Dodge Ram 2500 / 3500 (first & second gen)
- Typical Turbo: HX35 / HX-style with OE Cummins inlet fitting
Always verify fitment by VIN/ESN, especially on swapped engines or modified turbo systems.
Cross-Reference & Companion Cummins Parts
For a complete, leak-free turbo oil system on your 5.9L, pair CUMMINS 3912747 with these genuine Cummins components available at CPP Diesel:
- CUMMINS 3919687 HX35 TURBO OIL INLET FITTING (FEMALE CONNECTOR) – threads into the turbocharger and mates with the 3912747 hose.
- CUMMINS 3286499 OEM TURBO OIL DRAIN HOSE – 5.9L CUMMINS (1989–2004) – connects the rigid drain tube to the block.
- CUMMINS 3903744 OEM TURBO OIL DRAIN ELBOW – RAM 5.9L (1994–2002) – lower drain elbow that presses into the block.
- VIEW MORE GENUINE CUMMINS OEM PARTS – full Cummins catalog at CPP Diesel.
Common Cummins cross-reference numbers associated with this hose and related hardware include: 3912747, 3912747-A, 3907453, 3913824, 3919687, 3924389 (always confirm by VIN/ESN before ordering non-hose components).
Installation Notes
- Pre-soak old fittings with quality penetrating oil to avoid twisting or cracking hard fittings during removal.
- Inspect and clean the oil passage in the block and turbo inlet before installing the new hose.
- Route the hose exactly like the OE line – no kinks, no sharp bends, and clear of hot exhaust components.
- Prime the oil system and check carefully for leaks on initial start-up and after the first heat cycle.
Specifications for cummins 3912747
| Attribute | Value |
|---|---|
| Brand | Cummins (Genuine OEM) |
| Cummins Part Number | 3912747 |
| Alternate / Related Cummins Numbers | 3912747-A (flexible hose supersession, where listed), 3907453 (connector/seal kit reference), 3913824 (connector/seal kit reference), 3919687 (turbo oil inlet fitting), 3924389 (seal reference) |
| Function | Turbocharger oil feed line (flexible hose from engine oil gallery / filter head to turbocharger oil inlet) |
| Engine Compatibility | 5.9L Cummins B-Series, primarily non-certified 5.9L B engines; commonly used on 1991.5–1998 Ram 5.9L 12-valve applications |
| Vehicle Fitment (Automotive – Common Listing) | 1991.5–1998 Dodge Ram 2500 / 3500 with 5.9L Cummins 12-valve (verify by VIN/ESN) |
| UPC / Barcode | 607611433236 |
| GTIN | 607611433236 |
| Shipment Weight | Approx. 0.19 lb (hose only, without packaging) |
| Typical Shipping Method | Standard ground shipping from CPP Diesel; expedited options available at checkout |
| E-Codes / Emissions | Used on non-certified 5.9L B-series applications; consult Cummins documentation for specific emissions families |
| Prop 65 Warning | WARNING: This product can expose you to chemicals including engine oil and related residues, which are known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov. |
| Country of Origin | As labeled by Cummins (country of origin may vary by production lot) |
Frequently Asked Questions
WILL THIS FIT MY 1991.5–1998 5.9L 12-VALVE RAM?
Yes. CUMMINS 3912747 is commonly cataloged for first and second gen Ram 2500/3500 trucks with the 5.9L 12-valve (1991.5–1998). Because part usage can vary, always confirm by VIN/ESN before ordering.
WHAT FITTING DOES THIS HOSE THREAD TO AT THE TURBO?
Most OE HX35 turbo setups use the CUMMINS 3919687 turbo oil inlet fitting at the turbocharger. If your original fitting is corroded or rounded, replace it at the same time as the hose.
ARE SEALS OR CONNECTORS INCLUDED WITH 3912747?
No. This listing is for the flexible oil feed hose only. Connector and seal kits are commonly referenced under Cummins numbers such as 3907453 and 3913824; always verify the correct kit by VIN/ESN and current hardware on your engine.
SHOULD I REPLACE THE TURBO OIL DRAIN PARTS AT THE SAME TIME?
It’s a good idea. Many shops service the entire turbo oil circuit together. Consider replacing the CUMMINS 3286499 turbo oil drain hose and, where applicable, the CUMMINS 3903744 drain elbow, plus clamps and gaskets, to eliminate nuisance leaks.
IS THIS A GENUINE CUMMINS PART OR AFTERMARKET?
This hose is sold as a genuine Cummins OEM component through CPP Diesel, built to factory specifications for material, length, and fitment. We recommend genuine Cummins over generic copies for critical lubrication components like turbo oil feed lines.
DO I NEED TO PRIME THE OIL SYSTEM AFTER INSTALLATION?
Yes. Any time you disturb the turbo oil feed, it’s good practice to prime the oil system. Disable fuel, crank the engine to build oil pressure, then re-enable fuel and start the engine. Inspect carefully for leaks at both ends of the hose during warm-up.
