Re: HWH Six PAC Rebuild
Reply #11 –
Each owner who elects to rebuild their own six packs will have to address one basic question: do I rebuild the manifold in place on the coach, or do I remove the manifold and do the rebuild on a work bench? The answer will depend on several variables. Where is the six pack mounted on your coach? How easy is it to access the six pack, and how much room is there around it to work? To do a good job, you need to be able to see clearly what you are doing - this is not something you want to do "by feel". You need to have the "operating field" surgically clean to avoid getting trash in the manifold ports. You need to carefully inspect the condition of the manifold "seats" where each valve body is mounted. If these areas are corroded or scratched, then they must be smoothed out as much as possible before the newly rebuilt valves are installed.
I feel that removing the manifold makes the whole job easier, and reduces the chance of making mistakes - but that's just me. Because of the way the valves are spaced on the manifold, it may be impossible to rebuild them "one at a time". You won't be able to get a wrench on some of them due to lack of room. In this case, you may have to remove all 6 valves, rebuild them, then reinstall them. This is especially true if you try to do the rebuild under the coach with the manifold bolted in place.
Crawl under your coach (safely blocked up, of course) and study your particular setup. Then decide how to tackle the project. If you remove something, mark it like John H said, so you get it back in the right place. If you remove the air hoses and leave them hanging overnight, cover the open ends with masking tape to keep bugs and trash out. Take some photos before you start, if you (like me) need help remembering how stuff goes back together.
It's not a hard job, but it can be a challenge depending on your skill level. Take your time, don't rush it - you'll do fine. 
Topic: HWH Six PAC Rebuild