FILTER 5367859 - Caterpillar

Failure to replace the engine's thermostat on a regularly scheduled basis could cause severe engine damage.
Replace the thermostat on a regular basis in order to reduce the chance of unscheduled downtime and of problems with the cooling system.A new thermostat should be installed after the cooling system has been cleaned. Install the thermostat while the cooling system is completely drained or while the cooling system coolant is drained to a level that is below the thermostat housing.
Note: If you are only installing a new thermostat, drain the cooling system coolant to a level that is below the thermostat housing.
Personal injury can result from hot coolant, steam and alkali.At operating temperature, engine coolant is hot and under pressure. The radiator and all lines to heaters or the engine contain hot coolant or steam. Any contact can cause severe burns.Remove filler cap slowly to relieve pressure only when engine is stopped and radiator cap is cool enough to touch with your bare hand.Do not attempt to tighten hose connections when the coolant is hot, the hose can come off causing burns.Cooling System Conditioner contains alkali. Avoid contact with skin and eyes.
Illustration 1 g00788871
There are two temperature regulator housings (1) and (2). Each housing has two thermostats.
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.
Illustration 2 g00788885
Temperature regulator housing on the right side of engine
Illustration 3 g00788895
Temperature regulator housing on the left side of engine
Remove the gasket (1), the thermostat (2), and the seal (3) from the thermostat housing.
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.