Car spark plugs are one of those consumable components that need to be checked regularly and replaced in time. It is recommended to check the general condition of the candles and the gaps on them every 5 thousand kilometers. Most drivers have heard of this. At the same time, not everyone, even an experienced motorist, knows how to properly twist and twist the candles so that so that the motor functions at 100% and without negative consequences such as a drop in power and an increase in consumption fuel.
Before you figure out the correct way to twist the candles, you should clarify a couple of important points that are inextricably linked with this issue. The first is to lubricate the candle thread. Here opinions differ not only among motorists, but also among candle manufacturers. Some recommend thread lubrication, others do not. There is no unequivocal position here, it is best to get acquainted with the recommendations of a specific brand of the purchased part engaged in the production. The second important point is checking the threaded tip. In no case should it be unscrewed or loose. Otherwise, a spark will slip in the thread. You can tighten the tip using conventional pliers.
The third important point is why all this is being done? The fact is that improper tightening of the candles has specific negative consequences. If the plug has been tightened too loosely, it can deform over time. If the candle has been tightened too tightly, then another problem appears - overheating, which is fraught not only with unscheduled replacement of the consumable, but also with expensive repair of engine cylinders. How do you do it right?
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The plug must have the correct gap, the correct thread length and the correct glow number. If the candle is short or if it is screwed in the wrong way, the combustible mixture will not ignite at all as required. If the thread turns out to be larger than necessary, then over time it will be covered with carbon deposits and it will be impossible (almost) to unscrew the consumable element.
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For comfortable work, you need a wrench with special candle heads. They come in 16 and 21. He sets a gap on the candle, after which it is inserted into the head and screwed in with a key freely until it stops. After that, a torque wrench is taken with an exposed force of 39 Nm. They continue to screw in the candle until a characteristic click. It is important to take into account that the side electrode of the candle should always remain approximately horizontal.
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A source: https://novate.ru/blogs/090320/53721/