one. Fear of "dirty"

  if the parts such as fuel filter, oil filter, air filter, hydraulic oil filter and all kinds of filter screens are dirty, the filtering effect will be poor, and too many impurities will enter the cylinder of oil way, which will aggravate the wear of parts and increase the possibility of failure; if they are seriously blocked, the vehicle will not work normally. Dirty water tank fins, air-cooled engine block and cylinder head fins, cooler fins and other parts will cause poor heat dissipation and high temperature. Therefore, such "dirty" parts must be cleaned and maintained in time.

  two. Fear of "heat"

  if the temperature of engine piston is too high, it will easily lead to overheating, burning and melting, which will lead to cylinder holding; if the rubber seal, V-belt, tire, etc. are overheated, it is easy to be aged too early, the performance will decline, and the service life will be shortened; if the coil of electric equipment such as starter, generator, regulator, etc. is overheated, it is easy to be burned and scrapped; if the vehicle bearing is overheated, it will quickly deteriorate the lubricating oil, and finally The bearing is burnt and the vehicle is damaged.

  three. Fear of "string"

  Some matching parts,such as piston and cylinder liner, bearing bush and journal, valve and valve seat, connecting rod big head bush cover and rod body, are relatively well matched after a period of running in. During maintenance, attention should also be paid to assembly in pairs instead of "door-to-door" with each other.

  four. Fear of "anti"

  the cylinder gasket of the engine shall not be installed reversely during installation, otherwise it will lead to premature erosion and damage of the cylinder gasket; some piston rings with special shape shall not be installed reversely, which shall be assembled according to the requirements of different models; the fan blades of the engine also have the direction requirements during installation, and the fan is generally divided into exhaust and suction, which shall not be reversed, otherwise it will cause poor heat dissipation and high temperature of the engine; and For tyres with directional pattern, such as herringbone pattern tyres, the ground mark after installation shall make the herringbone point to the rear to ensure maximum driving force. For the two tyres installed in parallel, different models also have different requirements, so it is not allowed to install them at will.

  five. Fear of "lack"

  The engine valve keys shall be installed in pairs, such as missing or missing, which will cause the valve out of control and damage the piston and other parts; the engine connecting rod bolt, flywheel bolt, split pin, locking screw, safety plate or spring pad and other locking devices installed on the drive shaft bolt, which may cause serious failure in use; the engine timing gear room is used to lubricate the gear Once the oil nozzle is leaked, it will lead to serious oil leakage and low engine oil pressure; if the water tank cover, oil port cover and oil tank cover are lost, sand, dust, etc. will invade and increase the wear of all parts.

  six. Fear of "oil"

  the paper filter element of engine dry air filter has strong hygroscopicity. If it is stained with oil, it is easy for the mixture with high concentration to be drawn into the cylinder, resulting in insufficient air volume, increased fuel consumption and reduced engine power. The diesel engine may also cause "runaway"; if the triangular belt is stained with oil, it will accelerate its corrosion and aging, and it is easy to slip, resulting in reduced transmission efficiency; braking If the friction plate and brake belt of shoe and dry clutch are stained with oil, it is easy to slip and work poorly, thus threatening the driving safety; if the starting motor and generator carbon brush are stained with oil, it will lead to the insufficient power of the starting motor and the low electromechanical pressure of the generator due to the poor contact. Tire rubber is very sensitive to oil corrosion. Contact with oil will make rubber soft or peeling, and short-term contact will cause abnormal damage or even serious damage to tire.

  seven. Afraid of "washing"

  For the paper air filter element of the engine, when the dust on it is removed, it can not be cleaned with any oil, just use the hand to tap gently or blow the high-pressure air from the inside to the outside of the filter element; for the leather parts, it is not suitable to clean with oil, just use a clean cloth to dry them.

  eight. Fear of "pressure"

  if the tyre outer tube is stored under heap pressure for a long time and does not turn over in time, it will be deformed due to extrusion, which will affect its service life; if the paper filter element of air filter and fuel filter is squeezed, it will be greatly deformed and cannot reliably play a filtering role; the rubber oil seal, triangle tape, oil pipe, etc. cannot be squeezed, otherwise it will also be deformed, which will affect the normal operation Use.

  nine. Fear of "near fire"

  Especially for some diesel vehicles, it is difficult to start in winter. Some drivers often use blowtorch to heat them, so it is necessary to prevent the circuit and oil circuit from burning.

  ten. Fear of "Repetition"

  some parts are supposed to be used once, but some drivers or repairmen reuse them in order to save money or do not understand the "taboo", which is very easy to cause accidents. In general, the engine linkage