Carb oppos

"My bird IS the word" (mybirdistheword) 06/27/2020 at 12:18 • Filed to: None

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EDIT: looks like napa had a proper brass replacement fitting with a nipple for a traditional flare. Its a very unusual size, I didnt expect them to have one. Just another reason to patronize their store.

Little help with an issue? Some oddness with the vacuum for my brake booster

There is a port in the back of my carb for this little brass piece above. There is a hardline that goes back to this vacuum .... Check valve? On my brake booster. Not sure why it is designed like this, or even if any of this is original. The issue I am having is that the fitting for the line does not allow the line to fully seat in the brass adapter. The hardline still has about 1/8th of an inch of travel before it seats fully. Also, it appears as if the threads on the hardline do not match the brass adapter, like it has been cross threaded or fine vs course pitch but I cant really tell by looking.

Any insight would be marvelous

SBA Thanks You For All The Fish > My bird IS the word 06/27/2020 at 12:25

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Well, my “guesses” are...

This would be the primary vacuum supply for the master cylinder, conveniently drawn from the “vacuum” side of the carb interface. So, that’s easy.

Also, yeah, that would be a one-way check valve to hold vacuum for the master cylinder, even in conditions of throttle blades being open.

HOWEVER, the use of “brass fittings”, presumably in NPT thread, in an automotive application strikes me as peculiar. The odd fitting-and-seating is possibly mis-use of a plumbing NPT piece in an automotive application. I’d try to figure what your threads are you’re seating into— then get the appropriate fitting.

YMMV

ClassicDatsunDebate > My bird IS the word 06/27/2020 at 12:37

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Gimme a close up of the female brass threads including the bottom.  Gimme a shot of the male nut and tube flare.

Sovande > My bird IS the word 06/27/2020 at 12:45

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I don't know how it is from the factory, but on my car it's a nipple on the carb to a rubber hose to a check valve that mounts to the actual booster. I don't know that I've seen a hard line, though I like it. 

My bird IS the word > SBA Thanks You For All The Fish 06/27/2020 at 12:52

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NAPA had a replacement fitting that would work, so gladly I dont have to deal with whatever fuckery it is.

My bird IS the word > ClassicDatsunDebate 06/27/2020 at 12:53

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Luckily na pa had a fitting adapter of such a unique size that would work.

The Snowman > Sovande 06/27/2020 at 12:53

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I would try to just get a nipple in whatever thread the carb has and run new soft lines with the check valve inline.

WasGTIthenGTOthenNOVAnowbacktoGTI > ClassicDatsunDebate 06/27/2020 at 13:12

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I’ll take “phrases that make teenagers giggle ” for $500 Alex.

gettingoldercarguy > My bird IS the word 06/27/2020 at 13:23

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Napa is truly great in so many respects.  My favorite parts store by a country mile.

If only EssExTee could be so grossly incandescent > My bird IS the word 06/27/2020 at 13:38

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NAPA > Autozone

eyeofthetiger > My bird IS the word 06/27/2020 at 14:46

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Brake booster check valves are overrated. I replaced mine with bottle cap wrapped in electric tape.

gmporschenut also a fan of hondas > If only EssExTee could be so grossly incandescent 06/27/2020 at 15:24

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My only gripe is all the napas in my area close too early.