FailureAnalysisReview课件.ppt

故障分析检查Failure Analysis Review 发动机为何发生故障? 该故障是否在保修范围内? Why did this engine fail and is it a warrantable failure? 故障分析过程The Process of Failure Analysis 询问顾客Question the Customer 核实投诉和检查症状Verify Complaint Check Symptoms 拆卸Disassembly 拆卸零件/发动机 Disassemble the component/engine 放置好零件，使其免受损坏并便于以后检查 Organize parts to protect from damage and for later review 如有需要，对油、燃料和冷却液进行采样 Take oil, fuel, and coolant samples in case they are needed 寻找解决疑难问题的线索 Look for clues to solve the mystery 故障类型Types of Failure 活塞环损坏和故障 Piston Ring Damage Failure 活塞损坏和故障 Piston Damage Failure 轴承故障 Bearing Failures 曲轴故障 Crankshaft Failures 其它零件故障 Other components 活塞环故障分析Piston Ring Failure Analysis 微粒磨损 Fine Abrasive Wear 环划痕 Ring Scoring 粘性环 Sticking Rings 断裂 Breakage 微粒磨损Fine Abrasive Wear 外观/线索： Appearance/Clues: 外表呈暗灰色 Dull Gray Finish 细小垂直划痕 Fine Vertical Scratches 积碳 Carbon Build-up 环形槽磨损 Worn Ring Grooves 油环轨磨损 Worn Oil Ring Rails 微粒磨损Fine Abrasive Wear 可能的原因： Possible Causes: 空气滤清器泄漏 Leaks in Air Cleaner 空气过滤器维护不当 Improper Air Filter Maintenance 维修后发动机中留有磨屑 Abrasives Left in Engine after Repair 加油时漏斗中有脏物 Dirt in Funnels when Adding Oil 环划痕Ring Scoring 外观/线索 Appearance/Clues 金属错位造成的明显凹槽 Visible Grooves Caused by Displaced Metal 可能是钢制零件变色 Possible Discoloration of Steel Parts 刮伤的环Scored Rings 可能的原因： Possible Causes: 缺少润滑 Lack of Lubrication 过度供油 Overfueling 冷却液泄漏到气缸内 Coolant Leaking into Cylinder 过热和过载 Overheating Overloading 活塞上有积碳 Carbon Build up on piston 粘性环Sticking Rings 外观/线索 Appearance/Clues 环上沉积物过多 Excessive Ring Deposits 环过度磨损 Excessive Ring Wear 环被卡在槽内 Rings Seized in Grooves 环和活塞在后阶段磨擦 Scuffing of Rings and Pistons in Later Stages 粘性环Sticking Rings 可能的原因： Possible Causes: 沉积物过多 Excessive Deposits 燃烧不充分 Poor Combustion 过早磨损 Premature Wear 发动机油使用时间过久 Extended Engine Oil Service 环断裂Ring Breakage 外观/线索 Appearance/Clues 断裂！ Broken! 磨损或刮伤 Scuffing or Scoring 槽变宽或变形 Widened or Deformed Groove 气缸壁有划痕 Cylinder Wall Scratching 断裂的环Broken Rings 可能的原因： Possible Causes: 组装不当