COVER ASSEM. 4N4297 - Caterpillar

At operating temperature, the engine coolant is hot and under pressure.Steam can cause personal injury.Check the coolant level only after the engine has been stopped and the fill cap is cool enough to touch with your bare hand.Remove the fill cap slowly to relieve pressure.Cooling system conditioner contains alkali. Avoid contact with the skin and eyes to prevent personal injury.
Replace the water temperature regulator on a regular basis in order to reduce the chance of unscheduled downtime and 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 while the cooling system is completely drained.
Failure to replace the engine's water temperature regulator on a regularly scheduled basis could cause severe engine damage.
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.
Illustration 1 g01453097
Loosen hose clamp (1) and remove the hose from water temperature regulator housing (3).
Remove bolt (2) from the housing for the water temperature regulator. Remove water temperature regulator housing (3).
Remove the gasket.
The water temperature regulators may be reused if the water temperature regulators are within test specifications, are not damaged, and do not have excessive buildup of deposits.
Since Caterpillar engines incorporate a shunt design cooling system, it is mandatory to always operate the engine with a water temperature regulator.Depending on load, failure to operate with a water temperature regulator could result in either an overheating or an overcooling condition.
If the water temperature regulator is installed incorrectly, it will cause the engine to overheat.
Install a new water temperature regulator and a new gasket.
Install the hose. Tighten the hose clamp (1).
Inspect pressure cap and the gasket for damage. Replace the pressure cap if the pressure cap or the gasket are damaged.
Install the water temperature regulator housing (3). Install bolt (2).
Add the cooling system coolant. Maintain the coolant level to the top of the filler tube.
Close all access doors and lock the access doors.