Introduction to the use and maintenance of automobile spark plugs (ignition nozzles)

carSpark plugFunctions and features:

The role of the spark plug is toIgnition coilsThe generated pulse high-voltage electricity is introduced into the combustion chamber, and the electric spark generated by the electrode is used to ignite the mixture to complete the combustion.

The model of the domestic spark plug consists of three parts of numbers or letters. The previous number indicates the thread diameter. For example, the number 1 indicates that the thread diameter is 10mm. The letter in the middle indicates the length of the spark plug screwed into the cylinder; the last digit indicates the hot type of the spark plug: 1-3 are hot type, 5, 6 are Medium-sized, cold type above 7 is used.The "gap" of the spark plug is its main working technical index. If the gap is too large, the ignition coil andDistributorThe generated high-voltage electricity is difficult to skip, which makes it difficult to start the engine; if the gap is too small, it will cause weak sparks and electric leakage.

How to check the spark plug of a car:

1. Disassembly: Disassemble the high-voltage branch line on the spark plug in turn, and mark the original position to avoid dislocation of installation. During disassembly, please remove the dust and debris from the spark plug hole in advance to prevent debris from falling into the cylinder. When disassembling, use the spark plug sleeve to cover the spark plug, rotate the sleeve to remove it, and arrange them in sequence.

2. Check: The normal color of the electrode of the spark plug is off-white. If the electrode burns black and there is carbon deposit, it indicates that there is a fault.During inspection, the spark plug can be connected to the cylinder body, using the centerHigh-voltage lineTouch the terminal of the spark plug, then openIgnition Switch, Observe the high voltage jump position. If the electric jump position is in the spark plug gap, it means that the spark plug is working well, otherwise, it needs to be replaced.

The adjustment of the spark plug electrode gap: the spark plug gap of various models is different, and it should generally be between 0.7 and 0.9. To check the gap size, you can use a spark plug gauge or a thin metal sheet.If the gap is too large, it can be usedscrewdriverKnock the outer electrode gently with the handle to make the gap normal; if the gap is too small, use a screwdriver or a metal piece to insert the electrode and pull it outward.

Replacement of spark plugs: spark plugs are consumable parts, and generally should be replaced when driving 20000-30000 kilometers. The sign of spark plug replacement is no flashover, or the discharge part of the electrode is round due to ablation. In addition, if spark plugs often accumulate carbon and fail to fire during use, it is generally because the spark plug is too cold and needs to be replaced with a hot spark plug; if there is a hot ignition phenomenon or an impulse sound in the cylinder, a cold spark plug should be used. . (Bitcar.com)