Major engine damage could occur in a matter of minutes without proper cooling because combustion heat collects in metal engine parts. ![]() SERVICING THE LIQUID-COOLED SYSTEMĪ cooling system is extremely important to the performance and service life of the engine. Wear protective gloves and goggles while handling antifreeze and coolants. WARNING Ethylene glycol is a toxic material- Avoid prolonged skin contact or accidental ingestion. However, this much protection is not normally needed. Higher ratios of antifreeze produce even lower freezing temperatures for example, a 60/40 mixture will protect the cooling system to about -62F. It will provide protection from ice formation to about -34F. Cools the engine prevents overheating in hot weather.įor ideal cooling and winter protection, a 50/50 mixture of antifreeze and water is recommended. Lubricates the water pump, which increases the service life of the pump and seals. Prevents rust and corrosion by providing a protective film on the metal surfaces. Prevents winter freeze up, which can cause serious damage to the engine and cooling system. To counteract this, use an antifreeze.Īntifreeze, usually ethylene glycol, is mixed with water to produce the engine coolant. Some properties of water, such as its boiling point, freezing point, and natural corrosive action on metals, limit its usefulness as a coolant. Since water is easily obtained, cheap, and has the ability to transfer heat readily, it has served as a basic coolant for many years. The light will go out normally after the engine starts. If the light does not come on, either the bulb is burned out or the sending unit or connecting wire is defective. When the ignition switch is turned from OFF to RUN, the light comes on, proving that the system is operating. In some construction equipment a "prove-out" circuit is incorporated in the system. The indicating light warns of an overheating condition about 5F to 10F below coolant boiling point. When the engine coolant becomes too hot, a sending unit in the engine block closes, completing the circuit and the dash indicating light comes ON. This causes the pointer to swing to the right to indicate that the engine coolant temperature is rising.Ī temperature warning light informs the operator when the vehicle is overheating. As the sending unit warms up and passes more current, the thermostat heats up and bends. This thermostat is linked to the pointer. The bimetal-thermostat is similar to the balancing-coil type except for the use of a bimetal thermostat in the gauge. Therefore, the pointer moves 'to the right to indicate a higher coolant temperature. More current flows through the right coil, creating a stronger magnetic field. As the engine warms up, the sending unit passes more current. The pointer, attached to the armature, moves left indicating that the engine is cold. ![]() When the engine is cold, only a small amount of current is allowed to flow through the right coil the left coil has more magnetism than the right coil. An engine-sending unit, that changes resistance with temperature, is placed in the engine so that the end of the unit is in the coolant. The balancing-coil consists of two coils and an armature to which a pointer is attached. Temperature gauges are of two general types - the balancing-coil (magnetic) type and the bimetal- thermostat (thermal) type. The warning lights alert the operator to stop the vehicle before serious engine damage can occur. An abnormal heat rise is a warning of abnormal conditions in the engine. For this reason, a temperature gauge or warning light is installed in the instrument panel of the vehicle. ![]() The operator should be warned if the temperature of the coolant in the cooling system goes too high.
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