The full-automatic concrete mixer produces abnormal noise of piston door ring during driving. In the following, the determination and treatment method of abnormal sound of piston cylinder of mixer will be described.

活塞爆震缸的主要原因如下。活塞和气缸壁之间的间隙太大。WD615系列发动机活塞裙和气缸的标准间隙为0.143-0.182，大磨损限为0.35-0.40。如果发动机运转一段时间，气缸活塞将磨损并且润滑不好。活塞和气缸之间的匹配间隙由于磨损而增加，导致气环中的陡峭台阶和活塞与气缸碰撞。

The main causes of piston knock cylinder are as follows. The clearance between piston and cylinder wall is too large. The standard clearance between piston skirt and cylinder of WD615 Series engine is 0.143-0.182, and the large wear limit is 0.35-0.40. If the engine runs for a period of time, the cylinder piston will be worn and poorly lubricated. The matching clearance between piston and cylinder increases due to wear, resulting in steep steps in the gas ring and collision between piston and cylinder.

声音异常。经过一段时间的操作后，活塞裙和气缸严重磨损，导致严重的圆角和对气缸的冲击。由于各种原因，每个连杆变形，活塞偏心，间隙增 大，气缸被撞击。活塞爆震气缸导致发动机燃料消耗过多，发动机燃料消耗，燃料消耗和经济性。如果活塞严重撞击气缸，活塞将被拉动，气缸爆裂，连杆损坏，气缸体损坏。

Abnormal sound. After a period of operation, the piston skirt and cylinder are seriously worn, resulting in serious fillet and impact on the cylinder. Due to various reasons, each connecting rod is deformed, the piston is eccentric, the clearance increases, and the cylinder is impacted. Piston knock cylinder leads to excessive engine fuel consumption, engine fuel consumption, fuel consumption and economy. If the piston strikes the cylinder seriously, the piston will be pulled, the cylinder will burst, the connecting rod will be damaged and the cylinder block will be damaged.

如何确定活塞爆裂：

How to determine piston burst:

（1）气缸间的切油：气缸的位置由每个气缸的方法确定。当油被切入气缸时，声音会大大减少或消失，并且在供油恢复时可以清晰地听到声音。嗒嗒“声音，气缸活塞撞击气缸。

(1) Oil cutting between cylinders: the position of the cylinder is determined by the method of each cylinder. When the oil is cut into the cylinder, the sound will be greatly reduced or disappear, and the sound can be clearly heard when the oil supply is restored. Click "sound, the cylinder piston strikes the cylinder.

（2）为了进一步确认气缸活塞已被撞击，拆下气缸喷油器，在气缸上加入少量CD级增压油（密封件），安装喷油器并启动发动机。敲门声消失或变弱。操作后，再次发出爆震声，气缸肯定会被击中。

(2) In order to further confirm that the cylinder piston has been impacted, remove the cylinder injector, add a small amount of Cd level booster oil (seal) to the cylinder, install the injector and start the engine. The knock on the door disappeared or weakened. After operation, knock sounds again, and the cylinder will be hit.

对于活塞气缸，可以使用以下方法。

For piston cylinders, the following methods can be used.

（1）发动机启动时，在低温运转时会发出敲击声。温度正常后，声音消失，无需进一步处理即可暂时处理。

(1) When the engine is started, it will make a knocking sound when running at low temperature. After the temperature is normal, the sound disappears and can be treated temporarily without further treatment.

（2）当发动机温度正常时，有明显的敲击声。避免高速操作，拆卸和维修。

(2) When the engine temperature is normal, there is an obvious knocking sound. Avoid high-speed operation, disassembly and maintenance.

（3）拆下气缸盖并拉出活塞后，气缸可能会严重脱落或变形，或活塞与气缸之间的间隙可能过大，可能需要更换气缸套，活塞和活塞环。

(3) After removing the cylinder head and pulling out the piston, the cylinder may fall off or deform seriously, or the gap between the piston and the cylinder may be too large. It may be necessary to replace the cylinder liner, piston and piston ring.

（4）如果发现连杆（自动上料搅拌车）变形，应尽可能更换。

(4) If the connecting rod (automatic feeding mixer) is found to be deformed, it shall be replaced as far as possible.

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