Cooling system - Service Procedures
Checking the coolant level
Filling the coolant
The level should be approx. 4–5 cm (2") below the filler caps sealing edge. There must be an air space to allow for expansion of the coolant. WARNING! Open the filler cap very carefully when the engine is warm. Hot steam or fluid can spray out. An insufficient quantity of coolant can lead to poor circulation, which increases the risk of overheating, resulting in damage to the engine.Draining the coolant
WARNING! Open the filler cap (or the venting cock) very carefully when the engine is hot. Steam or hot coolant can spray out as system pressure is lost. NOTE! Check that the drain cock is closed and that the drain plugs are fitted and tightened before replenishing the cooling system. Replenishing shall be carried out when the engine is stopped. Open the venting cock, see fig above. Do not replenish too quickly to avoid air-locks in the system. The air shall be enable to flow out through the venting cock (TWD-engines) or filler opening.
Draining the coolant Before draining the coolant, stop the engine, unscrew the filler cap. See figure for the location of drain cocks and plugs. If a compressed air compressor is fitted there is also a drain cock on this. Unscrew the coolant filter, if fitted.
If a heater is connected to the engine’s cooling system the heat control valve shall be opened and the system vented during replenishing. Fill with coolant to approx. 5 cm (2") under the sealing surface of the filler cap. For coolants, see previous page. IMPORTANT! The engine must not be started before the system is vented and completely replenished.
Check carefully to make sure that all water runs out.
Start and run the engine warm. Open the venting cock for a moment after starting for the venting of any remaining air. Check the coolant level and replenish if necessary. Replenish with the same mixture already used in the cooling system.
Coolant temperature too high Too high coolant temperature can be caused by: ●
Low coolant level, air in the system.
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Reduced air flow through the radiator, dirty radiator.
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Poor drive belt tension.
A = Drain cock/plug for coolant
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Blocked cooling system.
B = Drain cock for coolant (TWD)
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Faulty thermostat.
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Faulty temperature gauge.
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Faulty setting of injection pump with regard to the preinjection angle.
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Faulty thermostically controlled fan (if fitted).
V = Venting cock (TWD)
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