In general, the normal service life of spark plugs varies from 2000 to 150,000 kilometers, depending on the material and manufacturing process. Because the working environment is very harsh, the spark plugs are prone to failure and normal expendable failures often occur, so it is a “consumable wearable†on the car.
Although cars are now equipped with advanced spark plugs such as platinum spark plugs, they do not need to be replaced as frequently as the conventional copper spark plugs. However, at intervals, the spark plugs still need to be checked. If the spark plug is rusted, the gap between the spark plugs is too large, or if the car has been driven for 50,000 kilometers, it has not been replaced. It is almost time for this change.
When the spark plug wears, accumulates dirt, or the gap is not seen, a "poor ignition" may occur. For example, the spark plug cannot produce a spark and the engine cannot be started or run unfavorably. Once the spark plug fails, it is likely to cause a drop in the overall performance of the engine and the car. Therefore, it is very important to ensure the good operation of the car by understanding the working efficiency and deadline of the spark plug, and ensuring that the correct selection, use and maintenance of the spark plug can be promptly cleaned and replaced in the event of a failure. Through regular inspection and timely replacement, you can save unnecessary repair costs.
Correct choice of model
Selection and replacement of spark plugs should first determine the quality of the spark plug and the degree of matching with the engine, including engine type, cooling method, number of strokes, fuel number and ambient temperature and common operating conditions, etc., so need to size, heat value, ignition gap , brand, price and other aspects of comprehensive selection.
1, size specifications:
The size of the spark plug is different due to factors such as diameter, length, and length of the electrode. In general, the corresponding car has been identified at the factory out of the spark plug model, so the first choice should be the appearance of the size of the spark plug.
2, calorific value:
In addition to different shapes and sizes, the spark plugs are classified into cold, medium, and hot types according to the calorific value. The heat value of the spark plug represents the speed of heat dissipation. The higher the heat value, the cooler the spark plug. The use of spark plugs with too low calorific value can lead to deflagration, which can lead to burning of ceramics on the head of the spark plug. If a broken ceramic falls into the engine, it is easy to cause danger and the electrode is easily soluble. If the heat value is too high, the head of the spark plug can easily be accumulated. Charcoal, running electricity, or no fire.
In general, high-compression ratio, high-speed engine should use cold spark plug; low compression ratio, low-speed engine should use hot-type spark plug, in between you can use medium-sized spark plug.
In addition, depending on the actual conditions of the area's ambient temperature, road conditions, and new and old machines, the selection of the heating value of the spark plug is also different.
3, ignition gap:
Different cars and engines will specify the optimal ignition gap. After a certain period of use, spark plugs may change due to normal wear or other factors, and they should be replaced in time.
If the selected ignition gap is not correct, it may have a detrimental effect on the function of the spark plug and the performance of the engine. If the clearance is too small, it may cause misfiring, running noise, and poor exhaust gas; if the clearance is too large, a higher ignition voltage is required so that the spark plug can skip this gap, which may cause misfire.
Timely carbon decontamination
During the use of spark plugs, the electrode and skirt insulation parts will have a normal carbon deposition and should be cleaned in time. If these coke deposits are left untreated for a long time, accumulation to a certain extent will lead to electrode leakage or even flashover. Therefore, carbon deposits should be removed regularly (generally 3,000 km to 5,000 km) to ensure the normal operation of the spark plug. At the same time when there is an oil stain on the spark plug, it should also be cleaned in time.
When cleaning the coke deposits and oil stains on the surface of the spark plugs, special cleaning equipment and corresponding solutions should be used, but sandpaper, metal sheets, etc. cannot be used conveniently and quickly. The correct treatment method is to use a dedicated cleaning device, there will be a very good cleaning effect; the second is to use the solution to clean, you can first spark plug into alcohol or gasoline soak for a certain period of time, when the coke softened and then use wool Brush dry and dry, this will ensure that the ceramic body outside the spark plug is not damaged.
It should be noted that when removing carbon deposits and oil stains from the spark plug electrode and skirt, fire cannot be used. Although this method is very effective on the surface, it is very easy to damage the spark plug. Because when the fire is burning, the temperature is difficult to control, it is easy to burn the skirt insulation, resulting in spark plug leakage, and the small cracks generated after the fire is often not easy to find, will bring a lot of trouble troubleshooting.
Change timing
Spark plugs should be replaced in time after they have been used for a certain number of years, otherwise they would be detrimental to the engine's dynamic and economic performance. In general, ordinary spark plugs should be inspected or replaced after 10,000 km or 1 year. Platinum spark plugs and Sheet Metal spark plugs can be replaced within 100,000 kilometers.
According to related studies, with the extension of the spark plug's life, the center electrode end face will change to the arc shape, and the side electrode will change to the concave arc shape. This shape will increase the electrode gap and cause discharge (ie spark ) Difficulties affect the normal operation of the engine. Therefore, after the spark plug's rated service life is reached, it should be replaced promptly.
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