Product Description

CUMMINS 3926761 OEM ENGINE COOLANT CHECK VALVE – RAM 5.9L 12-VALVE (1994–1998)

The Cummins 3926761 OEM engine coolant check valve is the factory-spec valve that keeps coolant flowing the right direction in your 1994–1998 Dodge Ram 2500/3500 5.9L 12-valve. When this valve sticks, leaks, or fails, you can see unstable temps, hot spots, or odd pressure behavior. Bolting in a genuine Cummins replacement restores OE coolant flow, protects your 12-valve from overheating, and keeps your cooling system happy for the long haul.

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Key Features & Benefits

• Genuine Cummins part #3926761 – not an aftermarket substitute.
• Restores correct coolant flow direction and helps prevent reverse circulation and pressure spikes.
• Direct-fit replacement for the original valve on 1994–1998 Ram 2500/3500 5.9L 12-valve Cummins trucks.
• Built to Cummins OE standards for sealing, durability, and thermal/pressure cycling.
• Proven on B-series engines, including automotive and many industrial/off-highway applications (verify by ESN for non-truck use).

Fitment

• Truck Fitment (Automotive):
  • 1994–1998 Dodge Ram 2500 5.9L Cummins 12-valve (P7100)
  • 1994–1998 Dodge Ram 3500 5.9L Cummins 12-valve (P7100)
• Engine Platform (Common B-Series Use):
  • Cummins 4B3.9, 6B5.9, B4.5, B5.9 G
  • Cummins QSB3.9, QSB4.5, QSB5.9, QSB6.7 (various CM calibrations – verify by ESN)
• Location: In the cooling circuit where Cummins uses a one-way valve to control coolant flow (refer to OE service manual for exact position on your application).

Recommended Cummins Cooling System Pairings

Refresh the rest of your 12-valve cooling system with matching OEM Cummins components from CPP Diesel:

• Cummins 3934373 180° Thermostat – OEM for 5.9L 12-Valve (1994–1998)
• Cummins 3928499 180° Thermostat – OEM for 5.9L 12-Valve (1994–1998)
• Cummins 3925466 Thermostat Gasket (Rectangular Ring Seal) – OEM for 5.9L 12-Valve (1994–1998)
• Cummins 3924755 Molded Coolant Hose – Thermostat Housing to Cylinder Head – OEM for 5.9L 12-Valve (1994–1998)
• Cummins 3920364 Coolant Temperature Sensor – OEM for 1998 Ram 5.9L 12-Valve

What’s In The Box

• (1) Genuine Cummins Engine Coolant Check Valve – Part #3926761
• No additional hardware included (re-use OE clamps/fittings or replace as needed).

Installation Notes

• Confirm flow direction before removal and install the new valve in the same orientation.
• Inspect and replace any swollen, cracked, or oil-soaked coolant hoses in the circuit.
• Refill with fresh coolant that meets the spec for your 5.9L Cummins and bleed air per service manual.
• Pressure-test and verify there are no leaks after bringing the engine up to operating temperature.
• For industrial or non-automotive B-series uses, verify the part against your Cummins ESN before installation.

FAQ

WILL THIS CUMMINS 3926761 CHECK VALVE FIT MY 1994–1998 5.9L 12-VALVE RAM?

Yes. This is the OE-style engine coolant check valve used on 1994–1998 Dodge Ram 2500/3500 trucks with the 5.9L 12-valve Cummins. Always confirm by VIN or engine serial number if you are unsure.

WHAT DOES THE COOLANT CHECK VALVE ACTUALLY DO?

The check valve is a one-way valve that keeps coolant flowing in the intended direction through the circuit. By preventing reverse flow, it helps maintain stable temperatures, protects against localized hot spots, and supports proper heater and radiator operation.

WHEN SHOULD I REPLACE THIS VALVE?

Replace the valve any time you see unexplained temperature swings, evidence of internal leakage, debris found in the old valve, or when performing a major cooling system refresh on a high-mileage 12-valve. If you have the system apart, this is a cheap insurance item.

WHAT OTHER CUMMINS PARTS SHOULD I REPLACE AT THE SAME TIME?

Many owners pair this valve with a fresh thermostat and seals – for example, a Cummins 3934373 180° thermostat , Cummins 3928499 180° thermostat , and the proper gasket set including Cummins 3925466 thermostat gasket plus any aged coolant hoses like Cummins 3924755 molded coolant hose .

DOES THIS VALVE ALSO WORK ON INDUSTRIAL OR OFF-HIGHWAY CUMMINS B-SERIES ENGINES?

This part number is used in many B-series and QSB applications, but Cummins made numerous configuration changes across models and calibrations. For generators, construction equipment, and other non-automotive uses, always confirm fitment against your engine serial number (ESN) before ordering.

IS THIS A GENUINE CUMMINS PART OR AFTERMARKET?

This valve is a genuine Cummins OEM component sourced through CPP Diesel. You get factory geometry, materials, and quality control – ideal when you’re troubleshooting a sensitive cooling system issue on a 5.9L 12-valve.

Specifications for cummins 3926761