CUMMINS 3903744 OEM TURBO OIL DRAIN ELBOW – RAM 5.9L (1994–2002)

Product Description

The Cummins 3903744 OEM Turbo Oil Drain Elbow is the lower return tube that presses into the engine block on 1994–2002 Dodge Ram 2500/3500 trucks with the 5.9L Cummins B-series. It routes hot oil from the turbocharger back into the crankcase, restoring a clean, leak-free drain path when the original elbow is corroded, damaged, or loose.

• Genuine Cummins OEM turbo oil drain elbow – not a generic copy.
• Lower press-fit block elbow for HX35/HY35-style turbo drain assemblies.
• Engineered for 1994–2002 Dodge Ram 2500/3500 5.9L Cummins (12V & 24V).
• Correct bend and length for proper hose alignment and oil flow.
• Ideal to replace any rusty, distorted, or leaking factory drain elbow.

Fitment

• Engine: 5.9L Cummins B-series (12-valve 1994–1998, 24-valve 1998.5–2002)
• Chassis: 1994–2002 Dodge Ram 2500 & 3500
• Position: Lower turbocharger oil drain elbow – presses into engine block above oil pan

Some catalogs list broader 1989–2002 coverage for 3903744, but automotive applications are most commonly 1994–2002 Ram 5.9L. Always confirm by VIN or engine serial number (ESN) for non-Ram or industrial engines.

Recommended Cummins Companion Parts

For a complete, leak-free turbo oil drain service on your 2nd Gen Cummins, pair this elbow with these genuine Cummins components:

• Cummins 3286499 OEM Turbo Oil Drain Hose – Ram 5.9L (1989–2004)
• Cummins 5264569 OEM Turbo Oil Drain Gasket – 5.9L (1989–2002)

Install this elbow with a clean block bore and a light coating of clean engine oil on the press-fit surface. After reassembly, warm the engine, let the turbo return area reach operating temperature, and check carefully for any seepage around the elbow and hose connections.

Installation Tips

• Carefully remove the old elbow to avoid gouging the block bore.
• Inspect the hose and gasket; replace if hardened, swollen, or oil-soaked.
• Route the drain hose with a smooth downward path – no kinks or sharp bends.
• Verify the turbocharger’s oil return passage is clear before startup.

FAQ

Will this fit my 1994–2002 5.9L Cummins Ram?

Yes. Part number 3903744 is the OEM lower turbo oil drain elbow used on 1994–2002 Dodge Ram 2500/3500 trucks with the 5.9L Cummins B-series (both 12V and 24V), when equipped with the standard HX35/HY35-style turbo drain assembly. Always verify unusual builds by VIN or ESN.

Is this the elbow that presses into the engine block?

Correct. This is the lower elbow that press-fits into the block above the oil pan. The upper metal tube and flexible hose attach to this elbow to complete the turbo oil return path back to the crankcase.

Should I replace the hose and upper drain tube at the same time?

It’s strongly recommended. A fresh elbow with a cracked hose or worn upper tube can still leak. Many owners replace the upper drain tube, rubber hose, and drain gasket at the same time to restore the entire oil return assembly and avoid repeat labor.

Will this work on 1989–1993 trucks or non-truck B-series engines?

Some parts catalogs show 1989–2002 coverage, but most on-highway Dodge Ram listings specifically call out 1994–2002. For early 12-valve trucks, industrial, ag, or generator applications, confirm with a Cummins ESN-based parts lookup before ordering.

Is this a genuine Cummins OEM part or aftermarket?

This listing is for a genuine Cummins 3903744 turbo oil drain elbow, built to OEM specifications for fit, coating, and durability. It is the correct replacement for customers who want factory-quality parts in their turbo oil drain system.

Specifications for cummins 3903744