8 发动机有异常响声故障现象发动机工作时,从气缸或齿轮室传出不正常的金属敲击声,并伴随工作粗暴现象。原因分析: (1)供油时间不对,引起敲缸。 (2)气门与活塞运动到上止点时相碰。 (3)喷油压力过低、滞后滴油、喷油器针阀偶件卡死及喷油嘴损坏等造成敲缸。 (4)气门间隙太大,产生金属敲击声。 (5)活塞与曲柄连杆小头的装配间隙过大。 8 abnormal sound engine failure Symptoms Engine work, from the cylinder or gear chamber abnormal sound of metal rattles, and accompanied by rough work. Analysis of the reasons: (1) fuel supply time is wrong, causing knocking cylinder. (2) When the valve and piston move to top dead center, they collide. (3) injection pressure is too low, drip drip, injector needle valve stuck and nozzle damage caused by knocking cylinder. (4) valve clearance is too large, resulting in metal percussion. (5) piston and crank connecting rod assembly gap is too large.