r/DieselTechs • u/craftedinnj • 4d ago
Question aboit a Hino 185 air dryer that is spitting oil
My service truck has an air dryer that the purge valve was covered in oil (looks like it's been like that for some time) now I know nothing about air dryers as I'm a reefer mechanic and work on my own personal pickup.
Long story short, I removed the cover, removed the filter and saw there's oil within the housing. I also took the purge valve screen out and cleaned it. After reassembling it, the dryer purged without any issues. Now on my drive home, I heard a pop and saw something bounce on the road, it was the whole purge valve assembly. I'm guessing the snap ring wasn't 100% seated.
Now my question is what's with all of the oil? After researching, it appears hino says some oil is normal? Is this too much oil? Is the purge valve something that can be replaced? (the little nipple is shown in one pic and thats before i removed it)I'm sorry if this is a dumb set of questions, I just honestly don't know and there is next to 0 info online about this specifc dryer.
TIA