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汽车大修时,内燃机活塞、活塞销、活塞环和气缸套同时更换的基础件,由于生产厂家没有实行“四配套”供应,营销部门也没有按同组尺寸相配后出售,致使修理单位在修理时无法装配,即是装配后,也不能保证修理质量。如慈利悬汽车修理厂在修理北京492Q汽油机时,购进的活塞,裙部大径属Ⅲ组尺寸(>φ92.012～φ92.024mm),气缸套内径属I组尺寸(φ92～φ92.012mm)。由于活塞裙部大径大于气缸套内径,活塞不能装入缸内。再如金华县汽车修理厂在修理朝阳6102Q型柴油机时,购进的活塞、气缸套和活塞销等基础件,活塞裙部大径虽然与气缸
When the vehicle overhaul, the internal combustion engine piston, piston pin, piston ring and cylinder liner at the same time the replacement of the basic parts, as the manufacturer did not implement the “four supporting” supply, the marketing department did not match the size of the same group after the sale, resulting in repair unit repair Can not be assembled, that is, after assembly, there is no guarantee that the quality of repairs. Such as Cili hanging car repair shop in the repair of Beijing 492Q gasoline engine, the purchase of the piston, skirt large diameter group Ⅲ size (> φ92.012 ~ φ92.024mm), cylinder liner diameter is a group I size (φ92 ~ φ92. 012mm). As the piston skirt large diameter greater than the cylinder liner, the piston can not be loaded into the cylinder. Another example Jinhua County Auto Repair Shop in the repair Chaoyang 6102Q diesel engine, the purchase of the piston, cylinder liner and piston pin and other basic parts, piston skirt large diameter and cylinder