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Thermactor system & vacuum lines in a 91

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7.6K views 27 replies 9 participants last post by  pcman1  
You must keep the coffee can reservoir. It serves the entire vacuum system, including the brakes.

The stripped stud is just fine as it is. The bracket is there just as a brace for the upper intake manifold. It can still do its job.

Only remove vacuum lines directly connected to the stuff you are removing. And certainly cap them.

Try using Sea Foam Deep Creep on the thermactor tube on the back of the head. Its the best rust penetrant ive used. Otherwise, without seeing it in person, I cant help much more
 
I disagree about the vacuum reservoir being required in all cases.
I honestly cant refute this statement. The coffee can is a reservoir, holding extra vacuum for when its needed. And i assumed since all vacuum is connected at the manifold, that it would affect everything. But now thinking about my 85, I dont have one at all. Though i only have two vacuum lines, one for the distributor and one for the PCV. I have hydro boost brakes and no emissions equipment.
 
I had a thought a little bit ago about the brake booster. It's on a much larger ID hose than most of the vacuum system. Could it even draw enough from the small nipple on the vacuum reservoir if it were plumbed that way? I'm thinking it has to pull straight from the tree for that reason.
Vacuum dynamics is not my strong point lol. Im sure it doesnt act like fluid under positive pressure, but Idk. Velocity would increase when going through a smaller nipple, much like the venturis in a carb. Vacuum cares less about restriction than positive pressure fluid.

I wonder if the vacuum brake booster line is big so on a rare occasion where the brakes are slammed on and a spike in vacuum might constrict the line.
 
Never ever seen either one of those in anything! Ive seen the spherical plastic one on 83 and older, but not in that location.