Plan your work 3-4 hours after the engine stops (let it cool down). It’s very important, cuz it’s still possible to unscrew the “hot” spark plug, but when tightening it is possible to damage the thread, which will be fraught with motor malfunctions due to improper or untight installation of it.
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The procedure for unscrewing and installing of new spark plugs will be the same when replacing, and during the test or prevention. To perform this operation, you will need a candle key. Practically you can use wrenches with a special spark plug head also.
What about the changing is that I recommend to do it in this way:
1. Park and wait
Stop the engine and allow it to cool.
2. Clean the surface
Clean the surface of the unit from dust and other debris, so that it does not get into the spark plug wells.
3. Disconnect the high-voltage wires from the spark
To do this, just pull the cap. This should be done carefully, slightly swaying from side to side.
4. Unscrew spark plug by the key
It is best to remember where some of them were, so as not to confuse, if the replacement kit was not made.
5. Inspect the spark plug
Clean up if prophylaxis is carried out.
Screw in peeled or new (with full replacement) spark plugs in their wells.
Before screwing in, it is also worth wiping the spark plug threads with a dry, clean cloth. It is not necessary to lubricate with oil, otherwise the thread will bind while the engine is running. It is not recommended to make excessive efforts in order not to damage the threads in the wells.
If the spark plug goes tight, then the bias is possible when screwing. It is necessary to carefully unscrew the spark plug, set the element smoothly and try again, and by hand. When the thing is screwed by hand, then tighten the key with the right moment, but gently, without effort. That's the whole procedure.