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Several fault problems and repair methods on diesel generator antifreeze
July 11, 2022
Antifreeze is an indispensable cooling medium for the normal operation of diesel generator sets, one is to the unit tank antifreeze, in winter will not freeze and expand and blow up; the second is to cool the engine, when the engine is running, with antifreeze as a circulating cooling liquid effect is very obvious. However, if improper use is also prone to failure, this top Bo power to introduce you to the diesel generator antifreeze several failure problems and repair methods.
Antifreeze is an indispensable cooling medium for the normal operation of diesel generator sets, one is to the unit tank antifreeze, in winter will not freeze and expand and blow up; second is to cool the engine, when the engine is running, with antifreeze as a circulating cooling liquid effect is very obvious. However, if improper use is also prone to failure, this top Bo power to introduce you to the diesel generator antifreeze several failure problems and repair methods.
Fault 1: correct measurement of antifreeze quality
When there is a fault in the liquid cooling system, the first thing you should measure the quality of antifreeze, measurement should be careful to prevent high-temperature liquid sprayed out scalding people. When the engine is at operating temperature, never remove the radiator cap. Remove the radiator cap and pump the coolant upward into the liquid specific gravity meter, check the liquid specific gravity meter reading to determine the exact freezing point.
Failure 2: Corrosion in the cooling system
PROBLEM: The coolant in the radiator has turned brown and the water pump water seal and bearings need to be replaced.
Troubleshooting: If the coolant has the color of rust, then there may be corrosion in the cooling system. Corrosion can easily cause damage to the water pump water seal and bearings. Rust in the system takes on the role of an abrasive on the water pump water seal corrosion is usually caused by the presence of oxygen in the cooling system. If the expansion tank is plugged, oxygen will enter the system.
Repair method: Drain the coolant from the system and check each hose of the expansion tank for blockage or leakage. Clean the expansion tank completely and flush the cooling system thoroughly. Remember that antifreeze must be handled in accordance with pollution control regulations and never drained into the sewer system. This is because antifreeze has various heavy metals and contains contaminants that can harm the environment.
The most effective way to flush a cooling system is to flush it against the flow. Use everyday water and air to flush in the opposite direction of the coolant flow, as shown in the diagram below. Some service shops have coolant flushers that provide the water pressure and air needed to remove most corrosion from the cooling system during flushing. To flush the radiator, water and air are pressed into the lower radiator hose, allowing water and corrosion to flow out of the upper radiator hose. To flush the block, first remove the thermostat. Then press water and air into the thermostat outlet, allowing water and corrosion to flow out of the pump inlet. Be sure to be careful not to apply too much pressure to the system or you may damage the radiator. Note: The backflush method is not recommended for plastic or aluminum radiators.
If the water seal has leaked, remove the water pump and replace it, or service the pump.
Add the proper amount of antifreeze and water and refill the cooling system. After filling the cooling system, the air must be bled out of the system to ensure there are no air pockets. An easy way to do this is to leave the radiator cap off the radiator and run the engine until the thermostat opens. The coolant will then circulate through the radiator and any remaining air bubbles will escape through the radiator cap holes. Some manufacturers recommend other methods to bleed the cooling system, so be sure to follow the steps given by the manufacturer for the particular engine being treated.
Fault 3: Engine overheating - hard water
Failure: Engines overheat very easily in hot weather. As time goes on, this problem becomes more and more obvious.
Diagnostic analysis: Many faults can cause the engine to overheat. One is the type of water used in the cooling system. If hard water is used, then the system can accumulate large amounts of silicates and calcium. Silicate and calcium buildup can block the transfer of heat to the outside of the radiator, which can easily cause the engine to overheat. Also, when there is corrosion build-up, the temperature sensor may give false temperature readings.
Repair: Looking into the radiator from above, look at the tubes to check for silicate and calcium buildup. If there appears to be silicate and calcium buildup, the radiator and engine must be cleaned. If there is equipment in the shop, follow the manufacturer's recommended procedure to clean the radiator and flush the block. If coolant is drained from the cooling system, make sure the coolant is handled properly.
Exclude the thermostat problem, this part is broken will also lead to Shangchai generator overheating
Flood season is approaching, the relevant departments to do a good job early flood emergency diesel generator testing and maintenance work