闭合油路回油道
loop circuit return passage
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
换向离合器油道
reverse clutch oil passage
reverse clutch passage