vacumn pressure
Thread Starter
Instructor
Joined: Dec 2005
Posts: 116
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From: Snellville Georgia
vacumn pressure
I had trouble recently getting my right headlight to pop up. Left went up right away, but the right was very slow. No lift on the wiper cover.
I also had trouble getting the wiper door cover to lift...could pull it up with my fingers, but not with vacumn pressure on its own.
I replaced all the hoses with a new kit hoses...they had to still be originals.
After replacement I still have the same problem...great left (improvement)on the left light, but absolutely no lift on the right and none on the wiper cover.
Obviously I have a vacumn pressure problem, yet no leaks apprear around the intake manifold. Is their a way to check the pressure at each hose fitting? can I use the pressure gauge into a section of a hose....what should it read? can I use the same guage as would fit into a spark plug hole to obtain a pressure reading?
'72...350SB..K engine..auto..
thanks for all your assistance.....rt
I also had trouble getting the wiper door cover to lift...could pull it up with my fingers, but not with vacumn pressure on its own.
I replaced all the hoses with a new kit hoses...they had to still be originals.
After replacement I still have the same problem...great left (improvement)on the left light, but absolutely no lift on the right and none on the wiper cover.
Obviously I have a vacumn pressure problem, yet no leaks apprear around the intake manifold. Is their a way to check the pressure at each hose fitting? can I use the pressure gauge into a section of a hose....what should it read? can I use the same guage as would fit into a spark plug hole to obtain a pressure reading?
'72...350SB..K engine..auto..
thanks for all your assistance.....rt
Race Director
Joined: Dec 1999
Posts: 19,610
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From: Forked River NJ
Just a observation. Vaccum is not pressure it is vacuum. A pressure gauge will not work. You need a vacuum gauge instaed. Vacuum is just the oppisite of pressure. Your motor should produce anywhere from 12 to 18 inches of vacuum. I run at 9 inches and it is enough to operate my headlights and wiper door.
Your vacuum tank may have some small pinholes in it and is not holding vacuum. Check the vacuum at the port on your intake first and start working from there.
Your vacuum tank may have some small pinholes in it and is not holding vacuum. Check the vacuum at the port on your intake first and start working from there.
Last edited by Gordonm; Nov 28, 2007 at 03:49 PM.
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Le Mans Master
Joined: Jan 2006
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From: Butler Pa
Race Director
Joined: Dec 1999
Posts: 19,610
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From: Forked River NJ
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