Fear of "heat"
If the temperature of engine piston is too high, it is easy to cause overheating, burning and melting, causing cylinder lock; rubber seals, V-belt, tires, etc. are overheated, which may lead to premature aging, performance degradation and shortening of service life; coils of electrical equipment such as starter, generator and regulator are overheated, which are easy to be burned and scrapped; vehicle bearings should be kept at appropriate temperature, such as overheating, the lubricating oil will deteriorate quickly, and eventually The bearing was burned and the vehicle was damaged.
Two fears of "dirty"
If the parts such as fuel filter, oil filter, air filter, hydraulic oil filter and all kinds of filter screen are too dirty, the filtering effect will become worse, too many impurities will enter the cylinder of oil circuit, which will aggravate the wear of parts and increase the possibility of failure; if the parts are seriously blocked, the vehicle will not work normally. If parts such as radiator of water tank, radiator of cylinder block and cylinder head of air-cooled engine and radiator of cooler are too dirty, it will lead to poor heat dissipation and high temperature. Therefore, for this kind of "dirty" parts must be cleaned and maintained in time.
Three fears of "string"
All kinds of coupling parts in the fuel system of diesel engine, the driving and driven gears in the main reducer of the drive axle, the hydraulic control valve block and valve stem, the valve core and valve sleeve in the full hydraulic steering gear, etc. These matching parts are specially processed and ground in pairs during the manufacturing process, which are very precise. They are always used in pairs during the service life, and must not be interchanged. Some matching parts, such as piston and cylinder liner, bearing bush and journal, valve and valve seat, connecting rod big end bush cover and rod body, are relatively well matched after running in for a period of time. During maintenance, attention should also be paid to assembly in pairs instead of mutual "door-to-door".
Four fears of "anti"
The cylinder gasket of the engine can not be installed reversely during installation, otherwise it will cause premature ablation and damage of the cylinder gasket; for some special shape piston rings, it can not be installed reversely, which should be assembled according to the requirements of different models; there are also direction requirements for the installation of engine fan blades. The fan is generally divided into exhaust and suction, which can not be reversed, otherwise it will lead to poor heat dissipation and high temperature of the engine For tires with directional patterns, such as herringbone tires, the ground impression after installation should make the herringbone tip point to the rear to ensure maximum driving force. For the two tyres installed in parallel, different models have different requirements, and can not be installed at will.
Five fears of "lack"
In the maintenance of vehicles, some small parts may be omitted due to negligence, and even some people think that it does not matter whether they are installed or not, which is very dangerous and harmful. The engine valve keys should be installed in pairs. If the valve is missing or missing, it will cause the valve out of control and damage the piston and other parts; if the engine connecting rod bolt, flywheel bolt, split pin installed on the transmission shaft bolt, locking screw, safety plate or spring pad and other anti loosening devices, once missing, may lead to serious failure in use; the engine timing gear chamber is used to lubricate the teeth If the oil nozzle of the wheel is not installed, it will cause serious oil leakage and low engine oil pressure; if the water tank cover, oil port cover and oil tank cover are lost, sand and dust will invade and aggravate the wear of parts.
Six fears of "oil"
The paper filter element of the engine dry air filter has strong hygroscopicity. If it is stained with oil, it is easy to draw the mixture with high concentration into the cylinder, resulting in insufficient air volume, increased fuel consumption and engine power reduction, and the diesel engine may also cause "runaway"; if the triangular tape is stained with oil, it will accelerate its corrosion aging, and at the same time, it is easy to slide, resulting in the reduction of transmission efficiency; brake shoes If the disc, friction plate and brake band of dry clutch are stained with oil, it is easy to slip and work poorly, thus threatening the driving safety; if there is oil stain on the carbon brush of starting motor and generator, it will lead to insufficient power of starting motor and low voltage of generator due to poor contact. Tire rubber is very sensitive to oil corrosion. Contact with oil will make the rubber soft or peeling. Short time contact will lead to abnormal damage or even serious damage to the tire.