Membership Tour A604 Rebuilding Tips

Late 604 Soleniod Pack Awhile back someone was interested in seeing the inside of a late 604 solenoid block. I took the photos so I don't get into a jam if they get mixed up during it's rebuild. One photo is the exploded view of the solenoid assembly, the other is of an individual solenoid. All of the solenoids look identical but are not. The two inner solenoids are normally open and the two outer are normally closed. To identify them, apply air to the lower port while blocking the port opposite of it. Air will flow freely on the normally open sloenoid until energized, and won't flow on the normally closed solenoid until energized. Electrically they ohm out the same as the early blocks, and are easier to rebuild due to less moving parts (less wear areas).