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. Replace the water temperature regulator while the cooling system coolant is drained to a level below the water temperature regulator housing.
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.
- Open the engine compartment.
Illustration 1 g01414542
- Slowly remove the cooling system pressure cap (1) in order to relieve the pressure in the cooling system. The regulator is located inside the housing (2) on the right side of the machine.
- Make sure that the coolant level is below the water temperature regulator.
Illustration 2 g01414548
- Loosen the hose clamp (3). Remove the hose.
- Remove bolts (4) and take off the water regulator's housing.
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 AVSpare 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 water regulator's housing and tighten the bolts (4).
Note: Tighten the bolts (4) to a torque of
14 N·m (10 lb ft).
- Place the hose on the regulator's housing and tighten the hose clamp (3).
- Add the cooling system coolant. Maintain the level of the coolant to 1 cm from the bottom of the fill pipe.
- Inspect cooling system pressure cap (1) and the gasket for damage. Replace the pressure cap (1) if the pressure cap or the gasket are damaged.
- Install the cooling system pressure cap (1).
- Close the engine compartment.