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1、首先检查发动机外部是不是有漏油处要特别注意曲轴前端和后端的油封处是不是漏油。曲轴的前端油封破裂损坏、老化或曲轴带轮与油封接触面磨损，会引起曲轴前端漏油。曲轴后端的油封破裂损坏，或后主轴承盖的回油孔过小，回油受阻，会引起曲轴后端漏油。另外还应注意凸轮轴后端油封是不是漏油。油封老化、破裂漏油应及时更换。除此之外，还要检查发动机润滑系各零部件是不是存在外漏现象。2、如果发动机的前后油封处漏油甚至前后气缸盖罩、前后气门挺杆室、机油滤清器、油底壳衬垫等多处有机油渗出，但又找不到明显的漏油处，应检查曲轴箱通风装置，清理曲轴箱通风管道，尤其是检查PCV阀是不是由于积炭和结胶卡滞造成工作不良。如果曲轴箱通风不良很可能会导致曲轴箱内压力升高，从而出现多处机油渗漏现象。3、机油压力是不是过高如果机油滤清器及一些机油管路的接头处经过紧固后还是漏油，应注意检查机油压力是不是过高，机油限压阀是不是工作不良。
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