闭合油路回油道
loop circuit return passage
带油道换位导线
Transposing cable with oil duct
第4代铁道油
generation 4 railroad oil
第5代铁道油
generation 5 railroad oil
发动机机油供油道
engine oil supply passage
辅助制动器油道
secondary brake oil passage
缸盖端油道
cylinder head end passage
缸盖机油道
cylinder head oil gallery
缸盖燃油道
cylinder head fuel gallery
cylinder head fuel passage