Coolant and oil to water and other issues in their daily work, maintenance personnel often encounter the case of engine lubricants reduce the surface, sometimes encountered in the oil surface increased. When the lubricant level change, to learn to analyze this change is normal.
Surface increased
If the surface of the engine lubricating oil is increased, then you need to carefully observe the state of the lubricating oil analysis is exactly what substance mixed with a lubricant. Common cause of elevated lubricant liquid, lubricating oil is mixed with water or fuel.
(1) engine lubricating oil containing water if the engine lubricating oil containing water, lubricating oil level will rise. The normal work of the engine, lubricating oil, also contain a small amount of water, but if there is a lot of water lubricant, then the water is no doubt from the engine cooling system. Due to damage to some parts of the engine, the engine coolant into the lubrication system, then often also found in the coolant lubricants.
(1) how to determine the lubricating oil containing water. Observe the appearance of the lubricating oil state, you can easily determine whether it contains water lubricant. The dumping of the water does not contain the lubricating oil will show the bright colors of translucent oil lubricants containing water rendered opaque brown, when the engine running for some time, the lubricating oil is white, and accompanied by foam.
② water and oil mixed hazards. As a rule, the lubricating oil in the water content below 0.03%, when the water content of over 0.1% in the lubricating oil additives (antioxidants, pure dispersing agent) will fail, and thus accelerate the lubricant oxidation. Chemical reaction occurs inside the engine under high temperature, lubricating oil and coolant, lubricating oil is emulsified into emulsion, which greatly reduces the lubrication. When the lubricant oxidation of organic acids and water react to generate inorganic acid. These acidic substances on engine components caused by corrosion. Contain more water in the lubricant, ranging from lubricating oil deterioration and mechanical rust prematurely, the weight will cause the engine to hold the tile or pull cylinders and other serious machinery accidents. If the lubricating oil into the coolant in the radiator and engine cooling water on the inner wall to form a viscous mixture, will seriously affect the cooling effect of the engine, causing the engine temperature is too high.
③ lubricants containing the reason of water. Moisture in the lubricant main sources:
First, the combustion exhaust gas generated in the condensation of water vapor. Engine work, exhaust the combustion chamber partially into the crankcase, the crankcase ventilation device is not working properly, water vapor can not be discharged from the combustion chamber into the crankcase when the temperature decreases, water vapor and mechanical contact condenses into water, to flow into the crankcase with lubricating oil mixed into a liquid emulsion.
Second, in some parts of the conventional engine cooling system is damaged, for example, the cylinder block or cylinder head waterways trachoma, pores or cracks, improper installation, cylinder seal water apron.
Is the oil cooler of the engine with oil cooler, require special inspection for damage. Engine cylinder head gasket damage.
For engines equipped with oil cooler, oil cooling by the coolant through the heat exchange completed. Brass lateral flow of lubricating oil in the lubricating oil cooler, coolant flow in the copper tube. If the oil cooler inside the brass cracks, then the coolant in the circulation process is entirely possible to enter the lubricant, resulting in lubricating oil.
Cylinder pad engine lubricants Road and cooling water, so the cylinder head gasket not only serve to seal the cylinder pressure, as well as ensure that the lubricant and coolant circulation in the different systems. If the cylinder head gasket cracking or aging, the engine lubricating oil channel and the cooling water may be the same, it will cause the lubricating oil in the water.
In general, cold start, the lubricant pressure higher than the pressure of the cooling system, lubricating oil leakage to the cooling system. Hot car in the idle case or turn off the cooling system pressure is higher than the pressure of the lubrication system, coolant leakage to the lubrication system.
(2) contains the engine lubricating oil mixed with fuel in the fuel, engine lubricating oil is a common fault. When the fuel supply system is bad or poor fuel atomization effect, fuel or too thick fuel mixture into the crankcase through the gap between the piston ring and cylinder wall fuel oil dilution and surface increase This situation is most common in the carburetor engine.
In addition, installed on the engine with forced lubrication the fuel pump or fuel pump oil, engine lubricating oil will be diluted by the fuel. This failure is more common in diesel engines.
So how to determine whether they contain fuel in the engine lubricating oil? First of all you can judge by smell, mixed with fuel oil will be a significant fuel odor. Can also take a small amount of lubricating oil from the oil pan, drop in on a piece of paper, see if the oil will quickly penetrate the White, such as to penetrate quickly prove to contain fuel in the lubricating oil, fuel penetration is greater than the lubricant.
The lubricants surface reduced
Reduce the surface of the engine lubricating oil is more common, there are two main reasons that the lubricating oil into the combustion chamber to burn or cause losses due to leakage.
(1) normal consumption under normal work of the engine lubricating oil consumption, normal consumption because as long as the movement between the piston and the cylinder wall exists gap, regardless of gap size, there will always be part of the lubricant with with the piston movement is brought into the combustion chamber with a gas mixture with burned.
Engine work, part of the fuel mixture and exhaust of the combustion chamber through the clearance between the piston ring and cylinder fleeing into the crankcase, these gases will accelerate the deterioration of the lubricating oil. Elevated temperature and pressure of the gas will allow the crankcase into the crankcase, causing oil to seep from the oil seal, etc.. Moreover, due to the reciprocating motion of the piston, the gas pressure of the crankcase cyclical changes, affecting the normal working of the engine. In order to avoid the emergence of these cases, the engine has a crankcase ventilation device, crankcase ventilation device will fresh air into the crankcase, and fleeing into the crankcase gases into the engine intake manifold, part of the engine lubricating oil on accompanying these gases into the engine combustion chamber to burn.
(2) abnormal consumption of non-normal consumption is usually because the engine itself malfunctions. Such as piston rings and cylinder wall clearance is too large, the lubricating oil into the combustion chamber through the gap a lot of burn, then from the exhaust pipe is clear that the phenomenon to take the blue smoke; oil pan and oil seal sealing leakage, resulting in lubricant leakage; engine overheating, a large number of lubricants heated to become steam, crankcase ventilation tube into the inlet mixture with burned; catching crankcase ventilation check valve, causing the lubricant poured into the combustion chamber burned . Of course, if you use poor quality lubricants will also appear excessive oil consumption, because of the poor stability of low-quality lubricants in the engine work will quickly decompose consumption.
Require special attention in this, for the engine with a turbocharger, it is possible to cause a large number of engine lubricating oil into the combustion chamber burned because the turbocharger failure. If you find a large number of engine lubricating oil consumption, emissions are blue, but normal engine cylinder pressure, engine power, no significant drop, you should check the turbocharger burning lubricating oil. The turbocharger is connected to the exhaust manifold on the operating temperature is very high, the wheel bearings and engine turbocharger common lubricating oil, general lead lubricating oil from engine sump tube to the turbocharger. When the turbocharger lube oil seal failure because of the high temperature, lubricating oil will be through the engine intake manifold into the combustion chamber to burn. The maintenance personnel can check the intercooler and intake manifold has a large number of traces of oil, in order to determine whether the turbocharger oil burning.



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