What is the function of adjusting valve clearance?

The function of adjusting the valve clearance of Pacific Auto Network is to ensure the normal operation of the valve train of internal combustion engine. Because the valve train works at high speed and the temperature is high, the valve tappet, valve stem and other parts will automatically push open the valve after being heated, which makes the valve and valve seat not closed tightly and causes air leakage.

The problem of 262896707 has been solved. Why do you want to adjust the valve clearance of an automobile engine through QQ one-click login? Anonymous user visited 153 times. 20 13.07.30 Please let me answer the questions. Answers are submitted anonymously. The best answer was recommended by experts. The time is 202 1. 165438+. Excessive clearance will cause the valve to close loosely, affect the engine work, cause insufficient intake and exhaust, and easily cause the valve to collide with the valve seat and the valve to ring. If the clearance is too small, the valve will not close tightly (there is no space), resulting in noise, increased wear and engine weakness. Adjusting the valve clearance needs to be in the state of hot car, which is the most normal working state. The valve clearance of intake valve and exhaust valve is different, so the valve clearance of intake valve must be smaller than that of exhaust valve. Due to different models, the requirements for valve clearance are also different. Generally, the intake valve is 15-20 line, and the exhaust valve is between 25-30 line. At present, most cars on the market use hydraulic valve tappets to automatically adjust the valve clearance, which can basically put an end to this phenomenon. Of course, once it is damaged, it can only be replaced and cannot be adjusted. I hope the above answers can help you.

53 comments on other answers

(5) Other answers (5 answers) Blue Bay 20 16.09.03 Answer: Some engines do not need to adjust the valve clearance, because they are equipped with hydraulic tappet (column) engines to adjust the valve clearance. See if there are any rocker arms. If there is a rocker arm, there will be an adjusting screw above the valve. Just adjust it. If I don't have a rocker arm, then insert a ruler to measure all the gaps. Exhaust valve clearance is 0.03 mm and intake valve clearance is 0.02 mm. Turn the engine to see which cylinder is at the top dead center, and take special tools to measure and adjust. 8 Comment on anonymous users 2013.10.15 The answer is the expansion coefficient of reserved valve metal. Its function is to prevent the valve metal from expanding without expansion gap, which leads to the valve not being closed tightly and leading to air leakage. Excessive valve clearance will produce metal knocking sound, while too small valve clearance will lead to lax closing and air leakage.

12 comments on anonymous users 20 13. 10.07 answer: because it will wear out over time, it will not match. In order to reduce wear and engine noise, the valve should be adjusted. 1 1 Comment Anonymous user 20 13.07.30 Answer: Metal will expand when heated. If there is no gap, the intake valve and exhaust valve cannot be closed normally. There are usually 30 to 60 lanes. Now hydraulic tappets are used to automatically adjust the clearance.

10 comments anonymous user 20 13.07.30 answers that the valve clearance refers to the clearance between the ejector pin and the camshaft when the engine is cold! Generally, the intake valve clearance is 0.3mm and the exhaust valve clearance is about 0.35mm! This gap is to compensate for the expansion and contraction of metal. Valve clearance is to keep the valve airtight when the engine works at high temperature! Of course, the gap should not be too big, which will cause poor air intake or exhaust!

(Photo/Text/Photo: Pacific Auto Network Q&A called Beast)