ENGINE AR-PRIMARY 5261886 - Caterpillar

Failure to replace the engine's thermostat on a regularly scheduled basis could cause severe engine damage.
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.
Replace the water temperature regulator on a regular basis in order to reduce the chance of unscheduled downtime due to problems with the cooling system.Replace the water temperature regulator and the seals while the cooling system is completely drained or while the cooling system coolant is drained to a level that is below the regulator housing.Contact your Caterpillar dealer in order to replace the water temperature regulator.