Open the engine compartment.
Remove the cooling system pressure cap in order to
relieve the pressure in the cooling system.
Loosen the hose clamp (4) and remove the hose (1)
from the water temperature regulator housing (3).
Remove the bolts (2) from the water temperature
regulator housing (3) and remove the water temperature
regulator housing (3).
Remove the gasket and remove the water temperature
regulator from the water temperature regulator housing.
Make a note of the orientation of the old regulator.
Former water temperature regulators may be used, if they
met 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 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. Orient the
regulator in the same manner as the old regulator.
Install a new gasket. Install the water temperature
Install the water temperature regulator housing and the
hose. Tighten the hose clamp.
Add the cooling system coolant. Maintain the level of
the coolant to the middle of the sight glass.
Inspect cooling system pressure cap and the gasket for
damage. Replace the pressure cap if the pressure cap
or the gasket are damaged.
Install the cooling system pressure cap.
Close the engine compartment.
Cooling System Water
Temperature Regulator - Replace