4种原因造成润滑油失效。一是润滑油进水,可能是机油冷却器泄漏、水泵密封失效导致水进入润滑油;缸垫烧蚀,缸套、缸盖有裂纹,喷油器冷却杯破损(特指NTA855型柴油机)也会使水通过燃烧室进入润滑油;高温使缸套胶圈丧失弹力,密封不严也会使水进入润滑油,在寒冷季节,由于废 4 kinds of causes oil failure. First, the oil into the water may be the oil cooler leak, pump seal failure led to the water into the oil; cylinder liner ablation, cylinder liner, cylinder head cracks, injector cooling cup damage (especially NTA855 diesel engine) Will make the water through the combustion chamber into the lubricating oil; high temperature cylinder liner rubber loss of elasticity, lax sealing will make the water into the lubricating oil, in the cold season, due to waste