CUMMINS 3927305 OEM THERMOSTAT HOUSING COVER GASKET – 5.9L 12V (1994–1998)

Product Description

If you're working on a 1994-1998 Ram or other application with the 5.9 L 12-valve engine and you’re replacing the thermostat or servicing the housing cover, the genuine Cummins 3927305 thermostat housing cover gasket is the correct factory-specified part.

This is a **direct-fit, genuine Cummins OEM part**, manufactured by Cummins to the same specifications as the part originally installed in your engine. That means reliable sealing performance and perfect fitment—no guesswork, no generic substitutes, just factory quality.

By installing this genuine gasket you restore the proper seal between the thermostat housing cover and the engine block/head, preventing coolant leaks, ensuring optimal thermal regulation and helping protect the engine over time.

Fitment Details

• Fits 5.9 L 12-valve Cummins B-series engines (1994-1998) as used in Ram 2500/3500 pickups.
• Specifically for the thermostat housing cover interface in the cooling system—replace whenever thermostat or housing is removed to ensure a proper seal. 

Why Choose the Genuine Cummins 3927305?

• Factory-specified quality and material—designed for Cummins engines. 
• Ensures correct sealing at high temperature and pressure environments typical of diesel engines. 
• Saves time and avoids the risk of leakage or coolant loss that can occur with non-OEM gaskets.

Cross Reference / Alternatives

When servicing your thermostat housing assembly you may also want to inspect or replace related components such as the thermostat or the housing itself. Consider also these parts (links to working pages on cppdiesel.com):

• CUMMINS 3928499 GENUINE 180° COOLANT THERMOSTAT – 5.9L 12V (1994-1998)
• CUMMINS 3924755 GENUINE COOLANT THERMOSTAT HOUSING TO CYLINDER HEAD HOSE – 5.9L 12V (1994-1998)
• CUMMINS 3927306 GENUINE THERMOSTAT HOUSING COVER BOLT KIT – 5.9L 12V (1994-1998)

FAQ

Will this gasket fit my 1994-1998 5.9L 12V engine?
Yes—this genuine Cummins 3927305 is designed for the 5.9L 12-valve (B-series) engine from 1994-1998, and it seals the thermostat housing cover interface. Confirm your engine series and family to ensure compatibility.

Can I reuse the old gasket?
Reusing the old gasket is not recommended—diesel engines operate at high temperature and pressure, and a new OEM gasket ensures the proper seal and long-term reliability.

What are signs I might need this gasket?
If you observe coolant seepage around the thermostat housing cover, overheating, or loss of coolant without obvious external leak, the gasket may have failed or been disturbed during servicing and should be replaced.

Is this part really made by Cummins?
Yes—this is the genuine Cummins part number 3927305, produced to factory specification.