Pulling the upper manifold tomorrow and changing a bunch of hard crusty (loose) vaccuum hoses. A buddy told me to expect six hours.....

Can anyone send me some good pointers on doing this job? I have a bunch of really nice silicon hose and all new gaskets. What else do I need besides patience?

 

money..... things will break.... its old plastic what those vacuume hoses are attached to

 

Band-Aids....

 

I already wrote my notes out: www.davidgeesaman.com look for the hose job writeup.

http://www.maxcooper.com and http://www.fd3s.net/vacuum_hose_replacement.html also have writeups.

Definitely get a set of sharp snips and a long reach needle-nose pliers.

There are several approaches: you can remove everything in there and put it all back together according to the diagram, or you can try to replace them one at a time. IMO, the first approach is better unless you have no patience at all for reading diagrams. It's rather like a puzzle. It could be a little less or much more than six hours, depending on if you replace all of them or only the easy-to-reach ones, and if your car still has all of the stock emissions parts installed.

I recommend removing each solenoid from the rack before pulling the rack (less chance of breakage), and testing them while they are out. See http://rx7.voodoobox.net for more info.

Dave

 

6 hours to 6 days, all I can say is GOOD LUCK! and be extra carefull pulling the old crusted hoses of, don't just pull, twist and pull easy at the same time so you don't brake the solenoids.

 

Slice the old hoses with an exacto knife before trying to pull them off the plastic solenoid nipples. This will reduce the chances of breaking them.

 

God bless ya man....I was in there once...I'll never do that BS again. Mostly because my patience level only goes so far unfortunately.

 

If you can get your hands on some laparascopic instruments such as "graspers" or curved dissector, they are very useful in re-attaching hoses in the back of the engine near the firewall.

 

Or buy a set of 90° bent-nose needle-nose pliers from Harbor Freight ($8) and use a dremel to grind the sharp edges and grips smooth. Took about 3 minutes. Now I can pull/push the hoses without fear of scratching or cutting into them, and reach into some pretty tight places.

Dave

 

Also, hit the hose with a flame (a lighter) for about 15 seconds, It heats up the brittle hose, and makes it a little easier to work with. Less chance of breaking the solenoid nipples.

 

Be careful how much pressure you use to cut them, however; maybe make a couple of passes to get a complete cut. I've seen a couple of people break a solenoid nipple just by pressing on it a little too hard.

 

What should one do in the event of a solenoid nipple breakage?

 

https://www.rx7club.com/showthread.p...olenoid+repair

 

Take you time and do it right. I doubt you will get it done in 6 hours. While I was in there I pulled my injectors and sent them to RC engineering for cleaning and blueprinting. I also replaced the FPD, polished the intake manifold and throttle body. Each solenoid was tested electrically and with a vacuum/pressure pump to make sure they were functioning properly. Same with the pressure chamber and vacuum chamber. All the check valves were tested and some replaced. Finally I installed a pulleys and a ignition amp while everything was easy to get to.