How to troubleshoot common cooling system problems(1)

The main fault of the cooling system is the engine temperature is too high, too high is mainly divided into the following three situations: cooling water is sufficient, but the temperature is too high; cooling water is not enough, temperature is too high; the temperature is suddenly too high in the work.

Corresponding to improve these situations are the following products：

Engine water pump, engine radiator, engine thermostat, engine fan parts, cylinder head

1. High engine temperature

1.1. Cooling water sufficient, high temperature

①fault phenomenon: engine cooling water in line with the standard, and no leakage, but the operation of the lack of power, the water temperature exceeds 90 ℃ or even boiling (commonly known as open pot).

②cause of failure: fan belt is too loose or slippery; thermostat large cycle or sub-pipe work poorly; radiator outlet pipe is sucked deflated or wall delamination blockage; radiator heat sink dumped too much or water pipe blockage; fan blade deformation, improper angle; cylinder water jacket scale deposits too much, and other reasons, such as ignition time is too late, the mixture is too rich or too thin.

③ Diagnosis and exclusion: First check whether the fan blade is deformed, whether the belt is too loose slipping. If good and then check whether the water circulation system is normal, whether the hose is sucked deflated, whether the wall is delaminated, whether the thermostat fails, whether the radiator is blocked, whether the blade is dumped too much, whether the cylinder scale is deposited too much, and whether the water distribution pipe is damaged or blocked. If it is still overheating through inspection, the reasons for technical use should be considered.

④Applicable products: Engine water pump

The function of engine water pump is to pressurize the cooling water and accelerate the circulation of cooling water. The engine water pump works continuously to make the cooling water circulate continuously in the waterway so that the engine does not generate too much heat. A faulty water pump can cause the engine to overheat, thus causing serious damage to the engine. So it is necessary to replace the faulty engine water pump in time.

1.2. Insufficient cooling water, too high temperature

① fault phenomenon: the engine cooling system can not accommodate the required cooling water; abnormal cooling water consumption in the operation.

② cause of failure: excessive radiator scale, part of the blockage, leakage or exhaust valve failure; water pump leakage; winter cooling water is not put on the net ice, cylinder channel hole and cylinder communication; valve wall rupture leakage, other parts of the cooling system leakage.

③ diagnosis and exclusion: First, check whether the cooling water capacity is sufficient, whether the radiator is good, whether the cooling system is leaking in all parts, such as the above checks meet the requirements, should check the radiator and cylinder water jacket inside the scale deposit blockage. In winter, we should pay attention to check whether the radiator is iced, check whether the water pump is leaking. If the external cooling system does not leak, and cooling water consumption is still faster, to consider the cooling system internal leakage, that is, pull out the oil dipstick found that there is water, then the cylinder wall or air intake channel wall rupture leakage or cylinder gasket waterway at the washout bad and cylinder communication. At the same time should also check whether the radiator exhaust valve failure.

④Applicable products: Engine radiator

Engine radiator helps to reduce the excess heat of the engine and reduce the impact of high temperature on the engine due to insufficient cooling water.