About car maintenance?

What are the daily car maintenance items? Automobile is a very complicated big machine, and it is inevitable that various mechanical parts will be worn during operation, which is caused by external human factors, environment and other factors. According to the driving condition of the car, the manufacturer will formulate corresponding car maintenance projects. What are the common maintenance items?

Project 1, minor repairs

Contents of minor maintenance:

Minor maintenance generally refers to routine maintenance items to ensure the performance of the vehicle after driving a certain distance within the time or mileage specified by the manufacturer. It mainly includes replacing oil and oil filter.

Interval of minor maintenance:

The time for minor maintenance depends on the effective time or mileage of the oil and oil filter used. Different brands of mineral engine oil, semi-synthetic engine oil and whole synthetic engine oil have different validity periods, please refer to the manufacturer's recommendation. Oil filters are generally divided into conventional oil filters and long-acting oil filters. The conventional oil filter is replaced by oil, and the long-acting oil filter has a longer service life.

Supplies in minor maintenance:

1, engine oil is the lubricating oil for engine operation. It can play the role of lubrication, cleaning, cooling, sealing and reducing engine wear. It is of great significance to reduce the wear of engine parts and prolong the service life.

2. The oil filter is a component used to filter oil. Engine oil contains a certain amount of colloid, impurities, moisture and additives; In the process of engine operation, metal chips, impurities in the inhaled air, oil oxides, etc. generated by the friction of various components. Are the targets of oil filter. If the oil directly enters the oil circuit without filtering, it will have an adverse impact on the performance and life of the engine.

Item 2, Major Maintenance

Contents of major maintenance:

Major maintenance refers to the routine maintenance of replacing oil and oil filter, air filter and gasoline filter within the time or mileage specified by the manufacturer.

Time interval for major maintenance:

Large maintenance is based on the existence of small maintenance. Generally, these two kinds of maintenance are carried out alternately. Different car brands have different intervals. Please refer to the manufacturer's suggestion for details.

Supplies under major maintenance:

In addition to changing the oil and oil filter, there are the following two items in car maintenance:

1, air filter

When the engine is working, it will inhale a lot of air. If the air is unfiltered, the dust in it will accelerate the wear of piston group and cylinder. Larger particles entering between the piston and the cylinder will also cause serious "cylinder pulling" phenomenon. The function of the air filter element is to filter out the dust and particles in the air and ensure that enough clean air enters the cylinder.

2. Gasoline filter

The function of gasoline filter is to provide clean fuel for the engine and filter out moisture and impurities in gasoline. So as to optimize the performance of the engine and provide the best protection for the engine.

Usually, when carrying out car maintenance, the operator will do other inspections according to the specific situation of the car, and other maintenance items will be added, such as inspection and cleaning of engine-related systems, positioning inspection of tires, inspection of fastening parts and so on. [2]

Daily maintenance

Daily maintenance, that is, daily maintenance, refers to the operation carried out by the driver before driving, during driving and after receiving the car. The content of operation center is cleaning, replenishment and safety inspection, which is a routine and necessary work to maintain the normal working condition of vehicles. The first-level maintenance is carried out by professional maintenance enterprises. The main contents of the operation center are cleaning, lubrication and fastening, as well as daily maintenance operations and inspection of safety components such as braking and operation. Secondary maintenance is carried out by professional maintenance enterprises. In addition to primary maintenance, the operation center mainly focuses on inspection and adjustment, tire disassembly and inspection of tire transposition. Inspection, diagnosis and technical evaluation should be carried out before secondary maintenance. According to the results, additional operations or minor repairs should be determined and combined with secondary maintenance. Maintenance intervals at all levels depend on the vehicle type and operating conditions.

Daily car maintenance is very important. A little carelessness in daily maintenance will not only cause unnecessary damage to vehicles, but also endanger driving safety. For example, insufficient lubricating oil will cause cylinder pulling and tile burning, and a certain part of the vehicle will fail, leading to traffic accidents; On the other hand, if the daily work is done carefully, not only can the vehicle be kept fresh, but also the technical conditions of various parts of the vehicle can be mastered to avoid mechanical accidents and traffic accidents.

In fact, the daily maintenance work is very simple, which can be summarized as: cleaning, fastening, checking and supplementing.

First of all, clean

The air contains a lot of dust, sediment and acidic substances, which are not only easy to be adhered by leaked fuel, but also easy to form a hard insulating layer under high temperature baking, which makes the heat dissipation performance of the parts worse, and is easy to be corroded by electrostatic adsorption of the car body and make it fade prematurely.

1, clean the air filter

Too dirty air filter will sharply prevent fresh air from entering the cylinder, resulting in excessive gas concentration, incomplete combustion, decreased power and excessive exhaust. Modern air filters generally use paper filter elements. Attention when cleaning: Do not use water or oil to clean, but use the method of beating and blowing. The beating method is to gently pat the end face of the filter element to make the dust fall off. Blow-clean method refers to blow-clean the inside of compressed air filter element, and the air pressure and force shall not exceed 0.3N/Pa.

2. Clean the oil filter

If the oil filter is blocked, it will hinder the flow of lubricating oil, resulting in poor engine lubrication, increased wear and even tile burning. Therefore, it should be cleaned or replaced regularly. If the climate is dry, it is usually replaced every 8000 kilometers. It should be shortened to 5 000km and replaced once.

Step 3 clean the battery

Modern cars generally use maintenance-free batteries. First, clean the top of the battery to avoid inter-electrode short circuit caused by electrolyte or other impurities. Secondly, clean the battery terminal to prevent the connector from generating oxide and causing poor contact. The vent hole should be clear to prevent the hand from bursting due to excessive pressure or high temperature in the battery.

Second, fastening.

After the vehicle is cleaned, it is necessary to fasten the joint. Due to the vibration, bump and shaking of the vehicle during driving, the connector is bound to be loose and worn. Therefore, it should be fastened in time in daily maintenance. The daily fastening of connectors is directly related to driving safety, especially the steering, braking and transmission of important components, which must not be taken lightly.

1. First, tighten the hose joints around the engine to prevent oil leakage.

2. Secondly, tighten the connectors of all lines and electrical equipment to prevent open circuit, short circuit and grounding from affecting the normal work of electrical equipment.

3. Third, check and tighten the main connector. Such as generator drive belt, connecting point of steering linkage brake device, transmission system and tire.

Third, check

After fastening the connector, BEL should check the height and quality of the oil, because the liquid will gradually wear and oxidize at high temperature, leading to the decrease of liquid level and poor performance.

1. Check the liquid level of the battery with a test tube with a diameter of 5 N 6mm. Use your thumb to forcibly seal the upper end of the test tube from the vertical direction of the liquid inlet to the contact screen, lift the test tube and measure the height of its liquid column, which is the liquid level of the battery. The standard should be10 n15 mm.

2. Check the height of lubricating oil level.

When the car gets cold, take out the dipstick, wipe it clean and insert it into the bottom of the oil pan. After taking it out, observe that its height should be between the upper and lower marking lines. Turn off the engine when the car is hot, and the spare oil will flow into the oil pan before measurement.

3. Check the height of the coolant level. When the car is cold, the coolant in the water tank should be full, and the liquid level in the expansion tank should be between the marks. When the hot car starts, the liquid level should be slightly higher than the superscript.

4. Check the levels of brake fluid and steering fluid.

Unscrew the bolt and directly observe whether the liquid level is within the specified marking range.

5. Check the quality of the oil.

No matter what kind of oil it is, you can check it in the following ways.

(1) Appearance method: check the oil sample taken out. If it is transparent, it means that the pollution is not serious; If there is fog, it means there is water in the oil; If it is gray, it may be contaminated by lead or other abrasives; If it is black, it is polluted by high temperature exhaust gas.

(2) Diffusion method: drop a drop of oil sample on the filter paper. If the diffusion is wide and there is no obvious difference between the oil droplet area and the diffusion area, it indicates that the oil is clean. On the contrary, the cleanliness of the oil will become worse.

Fourth, supplement

1, oil replenishment

If there is no obvious deterioration of engine oil during inspection, find out whether there is leakage, if there is, remove it and replenish the engine oil of the same grade in time.

2. Oil replacement

If the oil deteriorates or exceeds the replacement period, it should be replaced in time.

Usually change the oil every 8000 kilometers or half a year; Change the brake fluid every 20,000 ~ 40,000 kilometers or every 2 years; Replace the coolant every 1-2 years; Change the hydraulic oil once a year or 10,000 kilometers. [3]

Maintain taboos

First, avoid running the engine for a long time in an unventilated garage. The exhaust gas from the engine contains carbon monoxide, which is an invisible and odorless poisonous gas. Long-term exposure to low-concentration carbon monoxide gas will cause headache, shortness of breath, nausea and vomiting, physical weakness and dizziness, psychological confusion and even brain damage. If you start the engine in the garage, you should open the garage door or open the exhaust device, so as to discharge the exhaust gas from the garage at any time. Don't stay near the exhaust pipe of the working engine for a long time, even if you work in the open air.

Second, avoid sucking the tubing with your mouth. Gasoline is not only flammable and explosive, but also toxic. Especially leaded gasoline, will damage people's nervous system, digestive tract and kidneys. In addition, gasoline also contains high concentration of sulfide, because hydrogen sulfide is also toxic, if inhaled gasoline, it will lead to poisoning or death. In case of inhalation, force yourself to vomit and go to the hospital for treatment in time.

Third, avoid contact with carburetor cleaner. Carburetor cleaning agents mostly contain methyl chloride, aromatic hydrocarbons and ethanol, which are toxic to some extent, so it is very dangerous for these substances to be inhaled into the nose or splashed on the skin and eyes.

Fourth, avoid mechanical injury. The maintenance of a car is related to all aspects. During maintenance operations, obvious operation signs should be set to prevent others from being injured due to misoperation. When starting a car, pay attention to the gear of the transmission to prevent misoperation and personal injury. When working under the hood, others should be allowed to leave the cab to prevent the engine from suddenly turning or others operating the mechanism, resulting in accidental injuries. If you need to work under the car, you should set up obvious signs and cover the car with wood. When a car is supported by a jack, the jack should be placed stably. Driving tools (driving bench) should be prepared before driving, and fragile items such as bricks are prohibited. Do not test screw holes, lock holes, etc. when installing components. Avoid breaking your fingers with your hands. Don't work under the car when testing the engine.

Fifth, avoid fire. When maintaining cars, it is often necessary to use flammable and explosive materials such as oil and cleaning agents. Don't forget the fire-fighting measures at this time, and prepare a fire extinguisher just in case. Don't smoke near the fuel tank and battery, because combustible gas escaping from the fuel tank and hydrogen escaping from the battery can be easily ignited.

Sixth, avoid burns. The engine that has just turned off must be handled carefully to prevent burns caused by relatively high temperatures in various parts of the engine (water tank, exhaust pipe, power steering fluid tank, spark plug, etc.). ). If the engine temperature is high, do not remove the water tank cover or loosen the drain switch to avoid burns.

7. Avoid damaging the car. Brake fluid is harmful to automobile paint film (including leather shoes paint film) and can quickly dissolve paint film. Brake fluid is harmful to eyes. If it spills into eyes, it must be washed with clear water immediately.

Eight, avoid paying attention to the protection of rotating parts and automobile road test. When the engine is running, be careful that your hands, clothes and tools must leave the rotating fan and fan drive belt (it is best to take off the ring, watch, tie and other items). During the test run, the conditions of all parts of the car should ensure safe parking and effective steering. Road test vehicles must have obvious test marks. During the test run, personnel must drive safely and on the special test run track.

Nine, avoid not paying attention to the cleanliness of the workplace. When closing the engine cover or other assembly covers, check whether tools, rags, removed parts and other items are forgotten, and then close them after confirmation. [5]

Fuel system

After the fuel system is used for a period of time, the oil circuit will be blocked or blocked due to dust in the air and impurities in gasoline. In addition, the carbon deposit and colloid produced in the combustion process will also adhere to the intake and exhaust valves, intake and exhaust ports, throttle valves and combustion chambers, especially the fuel nozzles for gasoline injection, which will block and stick to the fuel nozzles, resulting in fuel leakage, poor atomization or even no fuel injection, resulting in increased fuel consumption, decreased engine power, unstable idle speed and so on. After testing, the product was used to clean 50 automobile engines, and obvious results were achieved: the average power was increased by 26.37%, fuel saving 1 1.20%, CO emission was reduced by 63.40%, HC emission was reduced by 59.00%, and smoke emission was reduced by 5 1.40%.

Hazards of carbon deposition in fuel system: 1. Engine knock and vibration II. Lack of fuel consumption and power 3. It's hard to start.

Cause of carbon deposition in fuel system: 1. Poor driving conditions: gravel and muddy sections; Urban congested roads not only have low speed, but also need frequent braking and starting. 2. The polluted air environment in the city. 3. The quality of domestic fuel is limited and there are many impurities.

Maintenance measures: It is recommended to clean the fuel system every10.5 million kilometers.

Summer maintenance

Protect the painted surface

In summer, the temperature rises, and it is often exposed to the sun, and the paint of the car is obviously not good. For car owners who cherish the car face, they must pay attention to protecting the paint surface of the car and often clean and wax it. If you want to protect your car paint more thoroughly, if you want to protect it more thoroughly, it is recommended to seal the car paint or coat it with a layer of "crystal protective clothing".

Prevent evaporation

When the temperature is high in summer, the evaporation of oil and water will increase, so it is necessary to cover the tank cover tightly to prevent the oil pipe from leaking; Always check the water level of the water tank, the oil level and height of the crankcase, the brake fluid level in the brake master cylinder, the electrolyte density and level in the battery, etc. If there is any discrepancy, it should be supplemented and adjusted in time.

Prevent puncture

In summer, the road surface temperature is high, and the use environment of automobile tires is poor. Therefore, we must pay attention to the inspection and maintenance of automobile tires, and regularly check the tire pressure to prevent tire puncture.

Check the brake system

Summer is the rainy season, and the wet road surface in the rainy season leads to the decrease of the friction coefficient between the tire and the road surface, especially when there is water on the tire tread, so a sensitive braking system is particularly important, so it is necessary to check the braking system from time to time and try to be prepared.

Keep it clean and tidy.

In the summer when windows are open, all kinds of harmful gases and pollutants will attach to the seats and ceilings of flannel fabrics, so it should be cleaned frequently. Plastic parts such as instrument panel and door trim should be cleaned with a brush and general cleaner. In order to prevent the surface from cracking and aging after ultraviolet irradiation, a layer of wax can be applied after cleaning. Anti-overheating: In summer, the ambient temperature is high and the engine is prone to overheating. Therefore, the inspection and maintenance of engine cooling system, including water tank, thermostat, water pump and fan, should be strengthened in summer, and cooling water should be filled in time. When the water temperature exceeds 100℃, stop in the shade to cool down, let the engine run at idle speed, and open the hood to facilitate heat dissipation.

Spontaneous combustion and explosion

Spontaneous combustion in summer is partly caused by the design failure of some models, and improper operation or hidden dangers are also the main reasons. Due to the high temperature in summer, the failure rate of the car itself is greatly improved. Therefore, it is necessary to do a good job in the inspection of automobiles, focusing on the oil and electricity lines of automobiles. If the lines are found to be aging, they should be repaired in time to prevent spontaneous combustion.

Prevent poor lubrication

When the temperature is high in summer, automobile lubricating oil is easy to be diluted by heating, which makes its oxidation resistance worse, easy to deteriorate, and even causes faults such as tile burning and shaft holding. So always check the quantity and quality of lubricating oil and replace it in time. At the same time, it is best not to mix different brands of lubricants.

Correct use of air conditioning

As the temperature rises in summer, the importance of air conditioning suddenly appears. When using the air conditioner, you must pay attention to the following matters, otherwise it will easily damage the air conditioner or cause unnecessary waste of oil and electricity.

Anti-rich mixture

Because of the high temperature, gasoline is easy to flow, and because of the expansion of metering holes, gasoline flow increases, and gasoline is easy to evaporate, resulting in excessive mixture. Therefore, it is necessary to adjust a small number of holes, adjust the position where the acceleration device is connected with the throttle rocker arm, appropriately reduce the oil level in the float chamber and reduce the oil supply.

Pay attention to "anti-freezing"

In summer, some people think that antifreeze can no longer be used, and ordinary tap water can be used instead. In fact, this is not appropriate. The specially prepared antifreeze is not only resistant to low temperature, but also resistant to high temperature. High-quality antifreeze can only "boil" when it is close to 200℃. Using antifreeze in summer, the owner is not easily troubled by the "boiling" of the water tank. In addition, antifreeze also has the functions of rust prevention and scale removal. Therefore, it is necessary to choose the original antifreeze in summer, which can play the role of "heatstroke prevention and cooling".

Clever use of air conditioning

Before entering the car, open the window for ventilation, and at the same time open the external circulation, and then turn on the air conditioner after the hot air in the car is exhausted, so that the cooling effect is faster and better. When the vehicle speed is lower than about 25km/h, the air conditioner should be placed at a lower gear to prevent power generation and air conditioning shortage. Driving in rainy days, the window glass is prone to fog, which affects the line of sight. At this time, as long as the wind direction is adjusted to the direction of the windshield and the compressor is turned on to send cold air, the purpose of effective defogging can be achieved within a few seconds.

Attention must be paid to the four elements of automobile maintenance in autumn.

Automobile anti-mildew coup

On rainy days, cars often get wet because of the wet weather, and sometimes there is some unpleasant musty smell. Here are several ways to help your car get rid of the musty smell and make your car have a fresh interior environment in the rainy season.

Sunshine method

There is one cheapest way to get rid of the musty smell in the car, including air conditioning. You can find a sunny day to drive in the sun, let the air conditioning system be in the warm wind gear, then adjust the air volume to the maximum, and bask in the sun for more than ten minutes with the doors and windows fully open. In addition, pay attention to check whether the filter screen of the air cleaner is clean and whether it needs to be replaced. There are many kinds of cleaners used to clean air ducts in the market. You can buy a bottle and wash it yourself.

The pore size of its internal pores is between 0.27 and 0.98 nanometers, showing crystal arrangement. At the same time, there is weak electricity. The molecular diameters of formaldehyde, ammonia, benzene, toluene and xylene are all between 0.4 and 0.62 nm, and they are all polar molecules, which have the characteristics of preferentially adsorbing harmful gases such as formaldehyde, benzene and TVOC, thus achieving the effect of purifying indoor air.

Perfume law

Perfume is more suitable when the smell is not very serious. You can sprinkle a little perfume or put a bottle of perfume in the car, which can reduce the odor and have a romantic feeling. However, it should be noted that most car owners like lemon-flavored perfumes, which are mostly acidic. When they are emitted, they will gather in the evaporator of the air conditioner, which will easily lead to mildew and odor. If you like perfume very much, you'd better choose a neutral one with a light fragrance.

air-filter

This is the most direct and convenient way. Direct boot, absolutely not in a hurry. However, this method is also more expensive, because the price of air purifiers on the market is between several hundred and several thousand. But it is worth thinking that you and your passengers can keep the air inside the car fresh in the rainy season.

Plant law

First of all, compared with chemical in addition to formaldehyde, plants are safer without secondary pollution, and compared with chemical in addition to formaldehyde, because they are extracted from plants, they are safer. Developed countries in Asia, such as Singapore, Japanese, Hongkong and Taiwan Province Province, have taken the lead in using this technology to purify the air in cities, homes and cars. With the increasing exchanges between Hong Kong, Macao and Taiwan, this technology has also entered Chinese mainland.

1. It is best to clean the air conditioner once.

Many car owners have no problem with the use of vehicles and often do not make big moves. Among them, air conditioners, for example, are not uncommon for car owners who do not clean all the year round. But the air conditioner in the car will be used for a long time in summer, so it is necessary to do a thorough cleaning. In addition to removing odor, a large amount of dust, dirt and bacteria inhaled by the air conditioner inlet are easy to affect people's health. Parts that need attention include: automobile condenser, which will affect the refrigeration effect of air conditioner. The condenser is usually installed in the front of the car and in the water tank. When cleaning, attention should be paid to prevent the cooling blade from being blocked by leaves and other things to affect the cooling effect; The air conditioner filter plays the role of filtering the air in the car, and it is easy to turn black after being used for a period of time. The staff of the general car beauty shop will advise the owner to replace it, but in fact, the air conditioning filter can be cleaned and can continue to be used. In the process of cleaning, impurities and surface dust on the air conditioning filter element are adsorbed and then washed.

2. Thoroughly disinfect the interior.

Due to the hot summer, many car owners don't often open windows, and the air conditioning is windy, so they often have to choose internal circulation. After a long time, the air in the carriage will become turbid, especially in the hot and humid weather before the thunderstorm, and bacteria are easy to breed. At this time, the owner can choose to buy some interior cleaner or go to the car beauty shop to thoroughly clean the interior of the car.

Freezing fast is indispensable for automobile antifreeze.

In summer, the coolant evaporates quickly. Always check whether the coolant is insufficient. If it is short, it is necessary to replenish antifreeze of the same brand in time, not antifreeze or water of other brands. Because antifreeze is the main working medium in the cooling system of automobile engine, its main function is to make the engine cooling system pass forced circulation and keep the engine at a suitable working temperature.

People call it "antifreeze" because it contains some chemicals with low freezing point, which can protect the engine and water tank of the car from freezing at low temperature. In addition to antifreeze, antifreeze prepared with chemical components such as ethylene glycol is not only resistant to low temperature, but also resistant to high temperature. This antifreeze can only be "boiled" when it is close to 200 degrees Celsius. If this antifreeze is added to the water tank in summer, it will not be easily troubled by the problem of "boiling" of the car water tank. In addition, antifreeze also has the functions of rust prevention and scale removal.

4. Protect the car paint and park in the shade

Although it looks lifeless, it is really afraid of the sun. Long-term exposure will make it old and wrinkled. Ordinary beauty waxing has some effect, but because any car wax contains silicon, it will rust the car paint after long-term ultraviolet irradiation, leaving small black spots. Moreover, car wax itself cannot enhance hardness and resist ultraviolet rays, and it will be lost quickly because of high temperature. Therefore, when parking, you should park your car in the shade.

Spring maintenance

Anti-spring rain painting beauty

There is a lot of rain in spring, which will damage the paint of the car over time. Therefore, in the rainy spring, it is best to give the car a paint beauty during seasonal maintenance.

There are two kinds of car wax on the market: solid wax and liquid wax. Generally, solid wax is grinding wax, and liquid wax is also called brightener or bright glaze, which can be evenly coated on the paint surface. The advantage of this beauty method is that it is simple to operate. Generally, car owners can DIY themselves or go to a car beauty shop to wax.

Glaze sealing is to improve the wear resistance of automobile paint by polymer covering, and achieve bright and lasting effect. But the durability is average. After 4-6 months, the polymer layer began to disintegrate gradually and needed to be redone. The owner can't operate by himself, and the construction service must be carried out by the exclusive store.

Timely dust removal

After entering the spring, it is very important to clean and dust the important parts of the car. If the automobile parts are too dirty, the filtering effect will be worse, and too many impurities will enter the oil cylinder, which will aggravate the wear of the parts and increase the possibility of failure. Therefore, when changing seasons, this kind of "dirty" accessories must be cleaned and maintained in time. Car owners can generally go to 4S shops or car beauty salons to dust air filters and air-conditioning filters for free.

Purify the air in the car

In spring, the dust and food residue in the car are easy to breed bacteria and mites. At the same time, spring is the frequent period of respiratory diseases. The space inside the car is small, and passengers are most likely to infect each other. Therefore, it is very important to kill harmful bacteria in the car. Generally speaking, there are two ways: steam sterilization and photocatalyst.

Steam sterilization is to aim the steam nozzle of the steam engine at the ceiling, seat, floor mat, air outlet of air conditioner, instrument panel and trunk, and use the steam sprayed by the steam engine to kill harmful bacteria in the car.

Photocatalyst is sprayed around the ceiling, non-contact operating table and car door to decompose tiny substances such as bacteria, mites and odor into carbon dioxide and water, thus achieving the purpose of sterilization and deodorization.

Double filtration, timely dust removal

After entering the spring, it is very important to clean and dust the important parts of the car. If the automobile parts are too dirty, the filtering effect will be worse, and too many impurities will enter the oil cylinder, which will aggravate the wear of the parts and increase the possibility of failure. If the traffic jam is serious, the vehicle will not work normally.

The most important things are air filters and air-conditioning filters. When the car is in use, when the ambient air quality is generally good, it is enough to replace the air filter regularly according to the maintenance cycle. However, when the ambient air quality is poor, attention should be paid to the cleanliness of the air filter. If the air filter is too dirty, the amount of air entering the cylinder will be reduced, which will lead to the decline of the vehicle's dynamic performance and the inability to increase the speed. Air conditioning filters should be cleaned or replaced regularly during use, otherwise blocked filters will prevent and reduce air from entering the evaporation box. Although the air conditioner is turned on, it still doesn't feel cold, and some vehicles are accompanied by peculiar smell.

Line/circuit fault

Inferior modification and maintenance is the culprit.

Grounding is the main cause of spontaneous combustion accidents caused by line faults. In particular, many new car buyers love their newly bought cars. You can add anti-theft devices to vehicles, replace them with high-grade audio-visual systems, modify or install lights to improve their appearance, and may also add some on-board appliances. However, because it was not refitted in a professional refitting shop, the line layout and specific structure of the vehicle were not analyzed, and the line power was not rechecked. For this reason, there have been many wrong modifications, such as disorderly wiring, no insurance in places with heavy loads, and no effective fixation in places that are easy to rub. Once the line is aging, overloaded, short-circuited, poorly contacted or worn on the ground, a lot of heat energy will be generated on the ground, coupled with poor quality of wires or inflammable materials around, spontaneous combustion accidents will be inevitable.

Common faults are: skin damage caused by vibration and friction between cable and frame and clamp; Taillight, brake light wire, etc. Damage due to vibration and friction; The insulator is loose and damaged due to the vibration damage of the connector at the lamp holder installation place; When the vehicle is driving or parking, it will automatically ground, which will lead to long-term high temperature flashover, which will damage the insulation of electrical appliances, switches and wires, further expand the scope of flashover and expand the high temperature area, and finally lead to spontaneous combustion and fire due to contact with paint, leaking gasoline and flammable materials.

The key to prevent spontaneous combustion and short circuit

In some single-track vehicles, the insulation of the live wire is damaged and grounded, or the electrical equipment is grounded, which will cause short circuit, especially in some vehicles with long service time, worn lines and disordered lines. The "protector" of the wires in the car is the fuse. Once the wire is short-circuited, a large current will be generated instantly, and the fuse will blow quickly, thus shorting the current. But if the fuse is too big, for example, someone tries to replace the standard fuse with copper wire, the protection function will be lost, which may lead to short circuit of the wire and fire.

In addition, the battery live wire (positive wire) on the single-track car is short-circuited with the metal body on the car, which will also cause a fire. Therefore, once it is found that the ammeter indicates a large discharge current, the electrical work is suddenly interrupted (such as high-load electrical equipment such as headlights and air-conditioning motors), rubber smells, or smoke is seen in the side gap of the hood or near the dashboard, you should quickly pull over, turn off the engine, turn off the main power switch of the whole vehicle, find out the reasons and troubleshoot.