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[示例一]故障现象一辆潇洒木兰50型摩托车,有时启动困难,发动机工作时有杂音,但加速性能和动力性能没有明显的不正常感觉。故障分析与排除由于发动机工作时的杂音特征不明显,加上用户不愿意让拆修理人员检发动机,于是,卸下排气管、强制风冷风扇的护罩,在活塞头部位于通过气缸排气口可见位置时,来回转动强制风冷风扇,观察发现,当活塞改变运动方向时,活塞环在活塞环槽内的活动量较大,表明活塞环侧隙过大。分解发动机后,用手上下摇动活塞时,活塞环在活塞环槽内上、下窜动明显,并有敲击声。说明发动机杂音由活塞环敲击活塞环槽上、下壁所产生。此外,活塞环在气缸内的开口间隙也过大,第一道环达1.2mm,第二道环达
[Example 1] Trouble phenomenon A smart Mulan 50 motorcycle, sometimes difficult to start, the engine noise at work, but the acceleration performance and power performance without obvious abnormal feeling. Fault analysis and troubleshooting As the engine noise characteristics of the work is not obvious, coupled with the user is not willing to let the demolition mechanic seized engine, so remove the exhaust pipe, forced air cooling fan guard, the piston head is located in the cylinder row Air port visible position, back and forth forced air cooling fan, the observation found that when the piston to change the direction of movement, the piston ring in the piston ring groove activity, indicating that the piston ring backlash is too large. After the decomposition of the engine, the hand shaking the piston up and down, the piston ring in the piston ring groove, the next play obvious, and a percussion. Description engine noise by the piston ring percussion ring groove, the lower wall generated. In addition, the piston ring in the cylinder opening gap is too large, the first ring of up to 1.2mm, the second ring