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My friend sent me 2 photos, the content is: There are about 2 circles of black marks on the thread of the spark plug, and he found that the ceramic part of his spark plug has a circle of yellow marks at the bottom. He asked some car mechanics in the society, and the answer he got was: "Your spark plug has serious carbon deposits, which means that the engine is not burning well. In addition, your spark plug has broken down and needs to be replaced"...
My friend sent me 2 photos, the content is: There are about 2 circles of black marks on the thread of the spark plug, and he found that the ceramic part of his spark plug has a circle of yellow marks at the bottom. He asked some car mechanics in the society, and the answer he got was: "Your spark plug has serious carbon deposits, which means that the engine is not burning well. In addition, your spark plug has broken down and needs to be replaced"...
1. The thread of the spark plug is black, is the carbon deposition serious?
Sorry, all spark plugs are like this!
Undecided, he thought of having a chat with me. All right! I'll start with those 2 circles of black on his spark plug threads. See if there is carbon buildup in the end! We know that the spark plug is screwed on the engine cylinder head, the head of the spark plug is a thread, and the engine cylinder head is a "screw hole".
We know that after any mechanical processing (such as opening) is completed, in order to prevent "stress concentration" at the corners (once the paper tears a gap, it is easy to tear again, because "stress is highly concentrated at the gap") and at the same time prevent If the edges and corners are rubbed and damaged, a "chamfer" will be processed.
After the spark plug is screwed to the engine, because of the existence of the chamfer of the screw hole of the cylinder head, when the engine is working, it is easier for carbon deposits and coking components to remain in this circle. Therefore, after the spark plug is removed, basically 1~2 turns of the thread head will be darker. —— Having said that, I think everyone understands that this is a normal phenomenon at all! !
2. The spark plug "breaks down, broken"?
How is the truth?
Then, what the heck is that "looks like greasy dirt" on his spark plug ceramic? Is it really the spark plug that "breaks down"? We all know that ceramics are insulating. Therefore, when the spark plug is working, the current is input from the terminal, transmitted all the way to the center electrode, and then flows out from the metal threaded part. However, if the current directly "breaks down" the ceramic and leaks electricity directly from the surface of the ceramic, it is called "flashover". (commonly known as leakage, high voltage breakdown)
Since the current flows through the ceramic surface, what traces will be left on the surface of the spark plug once the spark plug "flashover" occurs? Let's look at the photos together... Therefore, the spark plug of his car sent by the car friend "Qiuqiu", the yellow circle around the ceramic base is actually not a "flashover" at all. That is, his spark plugs are intact!
3. The spark plugs turn yellow and need to be replaced?
Tell you! All spark plugs are the same!
So what is this yellow substance? - Oil sludge (dry grease residue left after high temperature baking)! In fact, in essence, it is nothing more than that when the spark plug is working, high-voltage static electricity will be generated, and we know that static electricity will attract dust and grease...
If you want to break the casserole and ask me why the "oil scale" appears around the spark plug, it's even simpler: when the engine is working, because of the high temperature, the oil film on the metal surface of the engine, those in the engine compartment The oil film (more or less in every car) becomes the oil vapor.
The spark plug shows a strong adsorption effect due to the presence of strong high-voltage static electricity. Need to say what happened next? Have you ever seen the dust on the old TV screen at home? It is a typical electrostatic adsorption. The spark plug absorbs oil vapor, and the white ceramic surface is easy to "smoked yellow" slowly.
4. The engine can work smoothly!
Cars are not as fragile as we thought
That is to say, as long as it is a normal spark plug, it will look like this after working on the engine for a period of time! If a mechanic points to such a spark plug and scare you and says, "Your spark plug has broken down, it's useless"... I think you who have read this carefully will definitely not be fooled again in the future! Remember, as long as the engine is running smoothly, the spark plugs are all good!
Sometimes we will encounter many car owners who are "worried" about their car. For example, a rider told me before: he tried to replace the air filter himself, but because he wiped his hands with a damp cloth and touched the air filter, he was very worried about whether the air filter would get wet and affect the filtration. —— I asked him, "If this can affect the air filter, then we can't drive when it rains"? Cars are not as fragile as we thought.
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