When the engine is in use, open the water tank cover to check the coolant level, found that the liquid level floating with a layer of oil, but check the crankcase oil does not contain water, the liquid level has not changed.
The reason
The water-cooled oil radiator core tube rupture or sealing off, make the oil leaking into the cooling liquid.
The cylinder gasket is damaged, and the lubricating oil hole is communicated with the cooling water hole.
The poor quality of Baotou beiben heavy truck parts cylinder or cylinder cover, there are blisters in the next channel and the oil channel, the oil leaking into the cooling liquid.
The gasket of the oil cooler and the oil inlet and outlet of the cylinder body is damaged and the oil is leaked.
The diagnosis and treatment methods
If the coolant level is found floating oil phenomenon, the first primary coolant out, wash rinse after cooling channels, to join the new coolant, when used to observe the liquid level again how much time and the number of floating oil, determine the processing method.
If the engine is used for more than a month before the emergence of floating oil phenomenon, and the amount of oil is very small, can not be repaired, such as repair and overhaul of the machine, the water will not be immersed in the lubrication system. This is because even if somewhere there is minimal because of perforation, during operation of the engine oil pressure is greater than the cooling fluid pressure, oil under the action of the pressure difference to the leakage channel, when the engine stops working, the oil pressure is reduced, not to the cooling water leakage, although there is a certain pressure of small hole, but not enough to overcome the resistance of oil in holes of high viscosity, so the coolant can not enter the oil.
It is worth noting that: every time before or after the car to check the coolant level of motor oil floating volume change. When the oil floating volume suddenly increased, it must be timely maintenance.
When dismantling, first check the Baotou North heavy truck parts oil cooler is damaged. If there is leakage, replace the gasket or oil cooler core. Replace the gasket should pay attention to the formation and tighten the fastening bolts.
If the oil cooler is good, should remove the cylinder head, check the Baotou beiben heavy truck parts of cylinder head and cylinder if there are defects. If it is found that the sand plugging plugging agent available.
The careful observation of the water jacket and the oil cylinder gasket hole hole without flushing leakage traces. If so, can be coated with fine cotton thread sealant adhesive. Should pay attention to the formation of flat, not too thick, so as not to cause other leakage. If the cylinder gasket damage, should be replaced in a timely manner.
The fastening bolts should pay attention to methods, according to the provisions of the procedures and torque tighten bolts.