1. About "dirty"
If the parts such as the fuel filter, oil filter, air filter, hydraulic oil filter, and various filter screens are too dirty, the filtering effect will deteriorate, and too many impurities will enter the cylinder of the oil circuit, which will aggravate the wear and tear of the parts increases the possibility of failure; if it is severely blocked, it will also cause the vehicle to not work properly. Dirty parts such as water tank cooling fins, air-cooled engine block and cylinder head cooling fins, and cooler cooling fins will cause poor heat dissipation and excessive temperature. Therefore, such "dirty" parts must be cleaned and maintained in time.
2. About the wrong installation
Various coupling parts in the diesel engine's fuel system, 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. After special processing, they are ground in pairs, and the fit is very precise. They are always used in pairs during the service life, and must not be interchanged. Some parts that cooperate, such as piston and cylinder liner, bearing bush and journal, valve and valve seat, connecting rod cover and shaft, etc., after a period of running-in, are relatively well matched. During maintenance, attention should also be paid to Assembling in pairs, don't "drop in" with each other.
3. About "lack"
When maintaining vehicles, some small parts may be missed due to negligence, and some people even think that it doesn't matter whether they are installed or not, which is very dangerous and harmful. The engine valve locks should be installed in pairs. If they are missing, the valves will be out of control and the pistons will be damaged; the cotter pins, locking screws, safety plates, or the anti-loosening devices such as spring pads are missing, serious failures may occur during use; if the oil nozzle used to lubricate the gears in the timing gear chamber of the engine is missing, it will cause serious oil leakage, causing the engine to The oil pressure is too low; the water tank cover, the oil port cover, and the fuel tank cover are lost, which will cause the intrusion of sand, stone, dust, etc., and aggravate the wear and tear of various parts.
4. About "washing"
Some people who are new to driving or learning to repair may think that all spare parts need to be cleaned. This understanding is one-sided. For the paper air filter element of the engine, when removing the dust on it, you can't use any oil to clean it, just pat it gently with your hands or blow through the filter element with high-pressure air from the inside to the outside; for leather parts, it is not suitable To clean with oil, simply wipe clean with a clean rag.
5. About "near fire"
Rubber products such as tires, triangular tapes, cylinder liner water-blocking rings, rubber oil seals, etc., will be easily deteriorated or damaged if they are close to the fire source, and on the other hand, they may cause fire accidents. Especially for some diesel vehicles, it is difficult to start in the severe cold in winter, and some drivers often use blowtorches to heat them, so it is necessary to prevent the lines and oil circuits from burning out.
6. About "heat"
The temperature of the engine piston is too high, which can easily lead to overheating and melting, resulting in cylinder holding; rubber seals, triangular tapes, tires, etc. are overheated, and are prone to premature aging, performance degradation, and shortened service life; electrical equipment such as starters, generators, and regulators If the coil is overheated, it is easy to burn out and be scrapped; the bearing of the vehicle should be kept at an appropriate temperature. If it is overheated, the lubricating oil will deteriorate quickly, which will eventually cause the bearing to burn out and the vehicle to be damaged.
7. About "anti"
The engine cylinder head gasket cannot be installed reversely, otherwise, it will cause premature ablation and damage to the cylinder head gasket; some special-shaped piston rings cannot be installed reversely, and should be assembled according to the requirements of different models; the engine fan blades also have directions when installed Requirements, fans are generally divided into two types: exhaust and suction, and they should not be reversed, otherwise it will cause poor heat dissipation of the engine and excessive temperature; for tires with directional patterns, such as herringbone pattern tires, the ground marks after installation should make people The toe points to the rear for maximum drive. Different models have different requirements for the two tires installed together, so they cannot be installed at will.
8. About "oil"
The paper filter element of the dry air filter of the engine has strong hygroscopicity. If it is stained with oil, the mixed gas with a high concentration will be easily sucked into the cylinder, resulting in insufficient air volume, increased fuel consumption, and reduced engine power. The diesel engine may also be damaged. Cause "speeding"; if the triangular tape is stained with oil, it will accelerate its corrosion and aging, and at the same time it will easily slip, resulting in a decrease in transmission efficiency; brake shoes, friction plates of dry clutches, brake bands, etc., if oily If the starter motor and generator carbon brush are stained with oil, it will cause insufficient power of the starter motor and low voltage of the generator due to poor contact. Tire rubber is very sensitive to oil corrosion. Contact with oil will soften or peel the rubber, and short-term contact will cause abnormal damage or even serious damage to the tire.
9. About "pressure"
If the tire casing is stored in a pile for a long time and is not turned over in time, it will be deformed due to extrusion, which will affect the service life; if the paper filter element of the air filter and fuel filter is squeezed, it will have a large deformation It cannot reliably play a filtering role; rubber oil seals, triangular tapes, oil pipes, etc. cannot be squeezed, otherwise, they will also be deformed and affect normal use.
10. About "repetition"
Some parts should be used once, but individual drivers or repairmen reuse them for saving or because they don't understand the "taboo", which can easily lead to accidents. Generally speaking, engine connecting rod bolts, nuts, fixed bolts of imported diesel engine injectors, cylinder liner water blocking rings, sealing copper pads, various oil seals and sealing rings of the hydraulic system, and pins and cotter pins of important parts are disassembled. Finally, a new product must be replaced; for the engine cylinder gasket, although no damage is found during the maintenance, it is best to replace it with a new product, because the old product has poor elasticity, poor sealing, and is easy to be ablated and damaged. It needs to be replaced after a short period of use, which is time-consuming and laborious. If there is a new product, it is better to replace it as much as possible.
Post time: Aug-09-2023