BELLOWS AS 3793849 - Caterpillar

Pressurized system: Hot coolant can cause serious burn. To open cap, stop engine, wait until radiator is cool. Then loosen cap slowly to relieve the pressure.
Replace the water temperature regulator on a regular basis in order to reduce the chance of unscheduled downtime and the chance of problems with the cooling system.The water temperature regulator should be replaced after the cooling system has been cleaned. Replace the water temperature regulator and replace the seals while the cooling system is completely drained or while the cooling system coolant is drained to a level that is below the water temperature regulator housing.Note: If you are only replacing the water temperature regulator, drain the cooling system coolant to a level that is below the water temperature regulator housing.
Failure to replace the engine's thermostat on a regularly scheduled basis could cause severe engine damage.
Illustration 1 g00546349The water temperature regulator is located on the left side of the engine near the fuel filter.
Illustration 2 g00844391
Remove bolts (1) and cover (2). Remove all of the used gasket from the regulator housing.
Remove the elbow and water temperature regulator (3).
Caterpillar engines incorporate a shunt design cooling system and require operating the engine with a thermostat installed.If the thermostat is installed wrong, it will cause the engine to overheat. Inspect gaskets before assembly and replace if worn or damaged.
Install a new gasket on the regulator housing. Install a new water temperature regulator.
Install the bolts and the cover.