日本五十铃15t载重汽车的发动机为6缸直列、4冲程、水冷、直喷式发动机,采用铝合金活塞、干式合金铸铁缸套。在使用中有80％以上的发动机产生拉缸现象,所以拉缸已成为该型汽车发动机的一个主要故障。现将拉缸原因和预防措施分析如下,供参考。1 产生拉缸的主要原因1.1 润滑油喷射不良1.1.1 用于冷却活塞的喷油嘴堵塞。该发动机活塞由喷油嘴向活塞内顶端喷射的润滑油冷却。若喷油嘴局部或全部堵塞,活塞顶部就得 Japan’s Isuzu 15t truck engine for the 6-cylinder inline, 4-stroke, water-cooled, direct injection engine, the use of aluminum piston, dry cast iron alloy cylinder liner. In use there are more than 80% of the engine cylinder pull phenomenon, so the cylinder has become a major failure of this type of car engine. Now the reason and preventive measures cylinder as follows, for reference. 1 The main reason for producing cylinder 1.1 Lubricant poor injection 1.1.1 Used to cool the piston plug nozzle. The engine piston is lubricated with oil sprayed from the nozzle toward the top of the piston. If the nozzle is partially or totally blocked, the top of the piston will have to