GEAR-TRANSFER 7S4635 - Caterpillar

Failure to replace the engine's thermostat on a regularly scheduled basis could cause severe engine damage.
Note: If you are only replacing the thermostat, drain the cooling system coolant to a level that is below the thermostat housing.
Loosen the hose clamp and remove the hose from the elbow. Disconnect the hose assembly from the thermostat housing assembly.
Remove the bolts from the elbow. Remove the elbow and the thermostat housing assembly.
Remove the gasket, the thermostat, and the seal from the thermostat housing.
Used thermostats may be installed if they meet test specifications and are not damaged or have excessive buildup or deposits.
Since Caterpillar engines incorporate a shunt design cooling system, it is mandatory to always operate the engine with a thermostat.Depending on load, failure to operate with a thermostat could result in either an overheating or an overcooling condition.
If the thermostat is installed incorrectly, it will cause the engine to overheat.
Install a new seal in the thermostat housing. Install a new thermostat and a new gasket. Install the thermostat housing on the engine cylinder head.
Install the elbow and the hose. Tighten the hose clamp.