判断发动机的几种声音(Judge the several sounds of the engine)

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判断发动机的几种声音（Judge the several

sounds of the engine）

判断发动机的几种声音（Judge the several sounds of the engine） This paper simply introduces the characteristics of the engine’s various noise, the reason of failure and the method of checking and troubleshooting, for reference: The abnormal sound of cylinder, piston and piston ring. 1. Impact of piston top and cylinder cover. (1) the characteristics of the sound. The voice of the collision cylinder cover is in when the engine is running between the cylinder and the cylinder cover parts, continuous and clear dangdang metal tapping sound is strong, and the cylinder cover with some vibration. (2) cause of failure. A. The crankshaft bearing connecting rod bearing or bearing and the piston pin hole are severely worn and loose, and the piston top will impact the valve cover in a moment when the piston is traveling at the speed of the stroke.

B. May also be due to the manufacture of quality reasons or the use of accessories that do not support the piston to reach the upper end of the high and collision valve cover. (3) the elimination method. Remove the cylinder head, check the status of collision and can change depending on the situation

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of qualified products and supporting parts, can also add a suitable cylinder liner, cylinder cover increases without collision, and if relevant a serious wear and tear, and shall repair or replace the worn parts. 2. Collision of piston top and valve door: (1) characteristics of sound: The failure phenomenon occurs only on the overhead valve engine, in the collision in the upper cylinder and the cylinder cover can be heard a rhythm, interval of when, when metallic sound, engine speed increased, the noise is more serious. (2) cause of failure: A, on the rocker arm adjusting bolt to tighten the lock nut, by vibration after the change in the normal work, cause smaller valve clearance and resist valve rod end, on the exhaust stroke piston to check point is, touching the valve head, or the timing chain wheel assembly is not on the tag. B. The size of the valve rod and the valve catheter is not well matched. After the heat expansion of the metal, there is a stagnation phenomenon, or the material meets the requirements of excessive expansion coefficient. (3) failure judgment and exclusion. The first thing to determine is which valve is colliding, its method: remove the valve cover, contact with the swing arm or hold the rocker arm, and tap the start lever. If the rocker arm has a noticeable vibration or arm touch, then it can be judged