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Four reasons for high oil consumption

2022-08-30

 Generally, the engine has the phenomenon of oil consumption, and the consumption of different engine oil in a certain period is not the same, but as long as it does not exceed the limit value, it is a normal phenomenon.
 
 The so-called "burning" oil means that the oil enters the combustion chamber of the engine and participates in the combustion together with the mixture, resulting in the phenomenon of excessive oil consumption. So why does the engine burn oil? What is the reason for the high oil consumption?
External oil leakage
 There are many causes of oil leakage, including: oil lines, oil drains, oil pan gaskets, valve cover gaskets, oil pump gaskets, fuel pump gaskets, timing chain cover seals and camshaft seals. The above possible leakage factors cannot be ignored, because even a small leakage can lead to a large amount of oil consumption. The leak detection method is to put a light-colored cloth at the bottom of the engine and check it after starting the engine.
 
Front and rear oil seal failure
Damaged front and rear main bearing oil seals will definitely lead to oil leakage. This situation can only be detected when the engine is running under load. The main bearing oil seal must be replaced after wear, because like oil leakage, it will cause high leakage.
 
Main bearing wear or failure
Worn or faulty main bearings can whip up excess oil and be thrown against the cylinder walls. As bearing wear increases, more oil is thrown up. For example, if the bearing design clearance of 0.04 mm provides normal lubrication and cooling, the amount of oil thrown out is normal if the bearing clearance can be maintained. When the gap is increased to 0.08 mm, the amount of oil thrown out will be 5 times the normal amount. If the clearance is increased to 0.16mm, the amount of oil thrown out will be 25 times the normal amount. If the main bearing throws too much oil, more oil will splash on the cylinder, preventing the piston and piston rings from effectively controlling the oil.
 
Worn or damaged connecting rod bearing
The effect of connecting rod bearing clearance on the oil is similar to that of the main bearing. In addition, the oil is thrown more directly onto the cylinder walls. Worn or damaged connecting rod bearings cause too much oil to be thrown onto the cylinder walls, and the excess oil can enter the combustion chamber and be burned. Note: Insufficient bearing clearance will not only cause wear on itself, but also wear on the piston, piston rings and cylinder walls.