某型推进柴油机最低起动空气压力偏高故障原因分析

Analysis of the Causes of Relatively Higher Lowest Start-UpAir Pressure on a Propulsion Diesel Engine

针对某型船用V型推进柴油机在冷态起动时,起动空气压力满足柴油机起动要求情况下无法起动的问题。通过系统排查,确定故障原因为高压油泵柱塞偶件工作配合间隙在公差的上限所致。在此基础上完善了该型高压油泵的加工和试验规范。

A certain marine V type propulsion diesel engine had the problem that during cold start,the engine couldn't start up even when the start-up air pressure satisfied the diesel engine start-up requirements.Through systematical investigation,it was confirmed that the clearance of high-pressure fuel pump plunger matching parts achieved the upper tolerance limit was the reason.Based on the analysis results,the machining and test rules for this type of high pressure fuel pumps were improved.