The lubricating system is a closed cycle system, and the engine oil consumption is not very large when it is used normally. The consumption of engine lubricating oil which is small in wear and normal in operation is about 0.1-0.5L/100km. When lubricating oil is checked everyday, the consumption of lubricating oil increases gradually, which exceeds the normal consumption and is 1L/100km when wear is serious. At this point, when the engine is running, it is observed that the exhaust pipe is blue, and at the same time, a lot of smoke or pulse smoke is added to the lubricating oil outlet, which indicates that the lubricating oil has entered the combustion chamber, and there may be leakage or sealing failure of the lubrication system.

1. cause of failure

The oil leaks from the front and back ends of the crankshaft, the valve chamber cover, the timing gear cover, the camshaft rear end oil seal, the oil bottom shell, the valve chamber side cover or the lubricating oil pipe joint.

The engine piston, piston ring and cylinder wall wear the clearance between the piston and the cylinder wall is too large; the piston ring side clearance and the back gap or opening the gap is too large, the piston ring lock, or anti loaded counterparts; oil ring deposits too or elastic weakening, oil scraping capacity decreased, the valve rod and the catheter or excessive wear valve oil seal is damaged, the lubricating oil into the combustion chamber and burned.

The air compressor piston, piston ring and cylinder wear, lubrication oil with compressed air through the valve into the tank.

2. diagnostic method

First, check for possible leakage of lubricating oil, such as Baotou North Benz parts engine rear crankshaft, rear bearing seal, camshaft rear end cover seal, engine front timing gear chamber cover and all other possible leakage parts, and exclude.

The view of exhaust smoke, when accelerating exhaust pipe to discharge a lot of thick blue smoke, lubricating oil filling port also has a lot of smoke or pulsating smoke, this is due to the piston, piston ring and cylinder wall wear too much, the lubricating oil into the combustion chamber and the combustion due to remove the piston linkage, inspection and analysis. When the engine load operation, exhaust pipe to take the blue smoke concentration, but the oil export does not smoke, this is oil splash into the valve chamber, the valve guide clearance is sucked into the combustion chamber of the results. If a short period of time to take the blue smoke and the crankcase lubricating oil is not reduced, the air filter oil level is too high or blocked.

The inspection of Baotou Benz accessories crankcase ventilation, when the crankcase ventilation, the crankcase gas pressure and oil temperature, caused by oil leakage, evaporation, the Baotou Benz accessories oil pan gasket or valve chamber side cover gasket through the oil spill.

(4) the testing of lubricating oil consumption is two kinds of testing method and quality measurement method.

A. oil gauge determination: before testing, the car is placed on the level ground, and then shut down after preheating. The lubricating oil is added to the specified liquid level of the lubricating oil sump, and then marked clearly on the oil scale, and remember the location of the oil surface. The car put into practical use, so as to stop the operation of lubricating oil consumption to lower oil dipstick or driving a certain mileage, the car, still in the original location, according to the original test conditions, added to the known amount of oil pool (mass or volume) of the lubricating oil, the oil still rose to oil on the scale of the gas line, the amount of lubricating oil consumption. This method is simple, but the measurement error is large.

B. determination of quality: preheat the engine to normal temperature, oil drain plug according to the test conditions to open the oil pan, release lubricating oil shell oil, lubricating oil to flow into the drop when the oil drain plug screw oil sump, oil drain time and then remember, known for the quality of lubricating oil adding liquid the oil pan to the provisions, make the car running. When a car travels a certain mileage, when the consumption of lubricating oil needs to be tested on the side, it is necessary to release the lubricating oil in the oil pan and measure the quality according to the same test conditions and the time of oil release. The difference in the quality of the addition and release is the consumption of the lubricating oil. This method is time-consuming and time-consuming, but the measurement accuracy is high.