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故障现象一辆延安SX2190型汽车(采用WD615.77柴油发动机),在运行过程中出现油底壳机油增多现象。检查分析检查机油后发现,机油略有稀释并带有柴油味,疑为发动机气缸密封不严,导致柴油进入油底壳稀释了机油。测量气缸压力后发现,各气缸工作压力正常。又疑为柱塞式输油泵顶杆处漏油而致低压油路的柴油进入喷油泵凸轮室,喷油泵凸轮室的机油又通过发动机润滑系油道到达油底壳,但检查后发现输油泵密封正常。后来又怀疑是喷油泵柱塞处泄漏柴油至喷油泵凸轮室,再经润滑系油道而流入油底
Symptom A Yan’an SX2190-type car (with WD615.77 diesel engine), oil pan in the course of the phenomenon of increased oil. Inspection and analysis Check the oil and found that the oil slightly diluted and with a diesel taste, the engine cylinder is suspected to be lax, resulting in diesel oil into the oil pan diluted. After measuring the cylinder pressure, the working pressure of each cylinder is normal. Also suspected of plunger plunger oil spill Department caused by low-pressure oil into the fuel injection pump cam chamber, the fuel pump cam chamber oil through the engine lubrication system reaches the oil pan, but the inspection found that the oil pump Sealed properly. Later, it was suspected that the injection pump plunger leak diesel to the fuel injection cam chamber, and then by the Department of Lubricating Oil Road and into the oil