Misunderstandings in daily use of spark plugs
1. Avoid installing them too tightly
When installing spark plugs, they must meet the specified torque. When installing with special tools, it generally does not exceed the limit. However, if the force is too strong or too fierce, or when installing with a torx wrench, the spark plug porcelain core will often be damaged or the screw will slip, and the expansion groove will break, causing the spark plug to be scrapped; however, it cannot be installed. If it is too loose, the engine may not work properly.
2. Avoid distinguishing between hot and cold
In addition to different shapes and sizes, spark plugs are also divided into three types: cold type, medium type, and hot type. Generally, engines with high compression ratio and high speed should use cold spark plugs; engines with low compression ratio and low speed should use hot spark plugs, and there are medium-sized spark plugs in between.
In addition, the spark plug selection for new or overhauled engines and old engines can be different according to actual conditions. For example, when the engine is newer, the spark plug should tend to be a hot type; in an old engine that has been used for a long time due to performance degradation, the spark plug is prone to excessive carbon deposits and oil contamination. The spark plug should be medium or cold to improve the spark plug quality. Ability to resist oil stains.
3. Avoid burning
Using fire to remove carbon deposits and oil stains on the spark plug electrodes and skirts is a common practice that seems effective, but is actually very harmful. big. Because the temperature cannot be controlled during fire, it is easy to crack the skirt insulator, causing spark plug leakage. Moreover, small cracks produced after fire are often difficult to find, which brings great trouble to troubleshooting.
The correct way to deal with carbon deposits and oil stains on spark plugs is to use special equipment to clean them, which will have good results; second, to clean them with a solution, put the spark plugs into alcohol or gasoline and soak them for a certain period of time. After the carbon deposits have softened, brush them clean with a brush and let them dry.
4. Avoid long-term use
There are many types of spark plugs, but they all have their own economic life. If they are still used after the economic life is exceeded, it will be detrimental to the power and economy of the engine. play. Studies have shown that as the service life of a spark plug prolongs, the center electrode end surface will change to a circular arc shape, and the side electrodes will change to a concave arc shape. This shape will increase the electrode gap, cause discharge difficulties, and affect the performance of the engine. Works normally.
5. Avoid carbon deposits if left uncleaned for a long time
When the spark plug is in use, its electrodes and skirt insulators will have normal carbon deposits. If these carbon deposits are not cleaned for a long time, It will accumulate more and more, eventually causing the electrode to leak or even fail to spark. Therefore, carbon deposits should be removed regularly, and do not wait for the spark plug to stop working before cleaning. There are seven major taboos when using automobile spark plugs. The Bluebird exhaust side spark plug does not spark.