案情经过 1999年4月份,我市天河区一汽车修理厂承修一台日本三菱L 300美国版电喷4G63发动机。此车是托修方(车主陈先生)买的二手旧车,该车进厂修理的主要故障是发动机噪声及油耗大,行驶无力。经检查,诊断为发动机气门漏气及活塞环磨损。修理方案为换气门、活塞环、正时皮带等。2天后该车修竣出厂,当天晚上托修方由于该车抛锚打电话给承修方要求派人救援,承修方随即派人将车拖回厂检修,发现已有2个气门摇臂折断。 After the case in April 1999, the city of Tianhe District, a car repair shop to repair a Japanese Mitsubishi L 300 US version EFI 4G63 engine. This car is care repair side (owner Chen) to buy used cars, the car into the factory repair the main fault is the engine noise and fuel consumption, driving weakness. After examination, the diagnosis of engine valve leakage and piston ring wear. Repair program for the valve, piston ring, timing belt and so on. 2 days after the car was repaired factory, the night caretaker because the car broke down call the contractor asked to send someone to rescue, the repairer then sent the car back to the factory overhaul and found that there are two valve rocker arm broken .