（１）当冷车发动机启动后机油 ,压力随着机车温度的升高逐渐下降 ,甚至降到“０”位。这说明机车可能有如下故障 :①机油限压阀或回油阀磨损、密封不严而漏油。②曲轴瓦、连杆瓦磨损严重使配合间隙过大 ,机油随油温升高而泄漏。③在油道中有漏油之处 ,如正时齿轮轴套油道有裂 (1) When the cold engine starts, the oil pressure gradually drops as the temperature of the locomotive increases, even to “0”. This shows that the locomotive may have the following faults: ① oil pressure limiting valve or return valve wear, tightness and leakage. ② crankshaft, connecting rod and a serious wear and tear with the gap is too large, the oil leaks as the oil temperature increases. ③ in the oil in the oil leaks, such as timing gear shaft oil cracked