First, check the location of oil leakage is easy to leak oil parts is usually a poor seal gear room, crankshaft oil seal is bad, there is no plugging oil after the camshaft, oil pan or valve chamber deviation oil leakage, air compressor after the crankshaft The end seal ring is poorly sealed or the front crankshaft oil seal leaks. Of particular note is the oil leakage at the front and rear of the crankshaft. Front-end oil leakage is often caused by oil seal damage, aging, or wear of the crankshaft pulley or oil seal contact surface, oil leakage at the rear end of the crankshaft, in addition to poor after the oil seal, for the engine without rear oil seal, you should also check the rear main bearing cover back Whether the oil hole is too small or if the oil plug at the rear end of the camshaft is leaking.
Second, check whether the engine oil is drawn into the combustion chamber. When the engine is running at a high speed, if the exhaust pipe emits a lot of blue smoke, and there are a lot of smoke or pulsating smoke at the oil filling port, check whether the piston and the cylinder wall have been separated. Large, whether the piston ring has worn or even insufficient elastic force, whether the piston ring end clearance, side clearance, backlash is too large, and the distorted ring mounted reverse, the piston ring is locked or the counterpart situation, especially the first ring end clearance, Backlash and margins. These gaps are too large to squeeze the oil into the combustion chamber most easily. If the engine is running at a heavy load, the exhaust pipe will emit a blue smoke. However, the oil filling port does not emit smoke. This may be the result of the oil that has flown into the valve chamber and is drawn into the combustion chamber along the gap between the valve guides.
Third, check the crankcase ventilation If the crankcase ventilation is poor, the crankcase gas pressure and oil temperature will increase. The increase in gas pressure not only causes the oil to leak and evaporate, but also causes the oil pan gasket or the valve cover cover gasket to break. Therefore, if there are no problems in the current two inspections and the oil consumption is still too much, then the crankcase ventilation should be considered.
In addition, whether or not the engine oil is selected according to the requirements of the vehicle manufacturer and whether the engine oil is added according to the standard is also an influencing factor of excess oil consumption.
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