Dorman 904-486 Engine Coolant Thermostat Housing Flange Repair Kit

Coolant Thermostat Housing Flange Repair

Dorman 904-486 is an OE FIX flange repair kit for a corroded or leaking coolant thermostat housing. It restores the housing connection at a lower cost than replacing the full assembly, with fitment for select Ford Super Duty, Excursion, and E-Series applications with a 3-bolt pattern.

Key Features

• OE FIX flange repair solution for thermostat housing leaks
• Steel bolt material for secure fastening
• Includes bolts, gasket, and O-ring for the repair
• Flange plate inside diameter: 54.5 mm
• O-ring inside diameter: 55.5 mm
• Direct replacement reference: F81Z8592BA
• Part number: 904-486

Detailed Description

This Dorman thermostat housing flange repair kit addresses corrosion at the housing flange instead of requiring a full thermostat housing replacement. It is built for select Ford E-350 Club Wagon, Excursion, F-250 Super Duty, F-350 Super Duty, E-350 Econoline Club Wagon, E-350 Econoline, F-250 HD, F-350, and F-250 applications that use a 3-bolt pattern. The kit includes a flange plate, steel bolts, and sealing components sized for the repair, making 904-486 a practical service part for coolant leak correction.

What It Helps Fix

• Coolant seepage at a corroded thermostat housing flange
• Leaks caused by a damaged sealing surface
• Housing repair needs on 3-bolt Ford cooling system applications
• Replacement of an OE housing that would otherwise require full assembly replacement
• Service issues on Ford E-350, Excursion, and Super Duty cooling systems

Installation Notes and Tips

Verify the vehicle uses a 3-bolt thermostat housing pattern before ordering. Clean the mating surfaces thoroughly before installation, and confirm the flange plate and O-ring dimensions match the original housing. Use the included bolts and gasket during assembly, and torque fasteners evenly to maintain a proper seal. Part number 904-486 is also referenced against F81Z8592BA for the same application.

Quality Assurance

Dorman OE FIX parts are engineered to address common failure points with a repair-focused design. This flange repair kit is built to restore sealing performance on the affected thermostat housing without replacing the entire assembly.