69 Vette Vacuum
Thread Starter
Instructor
Joined: Apr 2005
Posts: 122
Likes: 48
From: Lebanon PA
69 Vette Vacuum
A close friend who is very good mechanically (I am not!), installed 2.02 heads on my 350 CI 69 Vette. (Not the original motor). Before the install, my wiper door and headlights worked fine. For some reason, I no longer have the vacuum I need to operate both of these components. We had a lot of stuff removed during the install and I have no idea what could have been overlooked. I am almost certain that the hoses, etc. are original. I am considering purchasing an upgrade kit to make sure that no hoses are damaged and/or are leaking. Any thoughts or suggestions on what I should consider? It is driving me crazy. To date, I have not had a lot of testing. (leaks, pressure, etc.) Thanks for the help.
Racer
Joined: Feb 2016
Posts: 488
Likes: 43
From: Vancouver British Columbia
Best think to do is buy a mighty vac (about 50$) and a cheap vacuum gauge (about 15$). These allows you to test various sections of your system and check leak down. In a perfect system there should be little or no leak down. Others will chime in and correct me but I would think that your particular engine/head set up should have plenty of vacuum to run your system. Obviously an older system will need a bit more vacuum as things get older and can bind a bit (example the complicated hinge set up for the wiper door) More than likely a hose has fallen off or you have a leak (or two) in one section of your system if the hoses are original.
Wilcox has some fantastic schematics for the 1969 for trouble shooting. You will need the schematic to understand the system. If nothing else start with the beginning of the system at the intake manifold and plug off the rest of the system and see what kind of vacuum you are working with. Then move outwards through the system slowly and methodically till you find your problem. Once you are done you will have a complete understanding of the system. Keep in mind the mighty vac will test the smaller components but something as large as the vacuum tank will be a bit large to pump up by hand with the mighty vac.
Good Luck, Pete
Wilcox has some fantastic schematics for the 1969 for trouble shooting. You will need the schematic to understand the system. If nothing else start with the beginning of the system at the intake manifold and plug off the rest of the system and see what kind of vacuum you are working with. Then move outwards through the system slowly and methodically till you find your problem. Once you are done you will have a complete understanding of the system. Keep in mind the mighty vac will test the smaller components but something as large as the vacuum tank will be a bit large to pump up by hand with the mighty vac.
Good Luck, Pete
Last edited by VancouverL71; May 5, 2019 at 11:24 AM. Reason: spelling
Thread Starter
Instructor
Joined: Apr 2005
Posts: 122
Likes: 48
From: Lebanon PA
Best think to do is buy a mighty vac (about 50$) and a cheap vacuum gauge (about 15$). These allows you to test various sections of your system and check leak down. In a perfect system there should be little or no leak down. Others will chime in and correct me but I would think that your particular engine/head set up should have plenty of vacuum to run your system. Obviously an older system will need a bit more vacuum as things get older and can bind a bit (example the complicated hinge set up for the wiper door) More than likely a hose has fallen off or you have a leak (or two) in one section of your system if the hoses are original.
Wilcox has some fantastic schematics for the 1969 for trouble shooting. You will need the schematic to understand the system. If nothing else start with the beginning of the system at the intake manifold and plug off the rest of the system and see what kind of vacuum you are working with. Then move outwards through the system slowly and methodically till you find your problem. Once you are done you will have a complete understanding of the system. Keep in mind the mighty vac will test the smaller components but something as large as the vacuum tank will be a bit large to pump up by hand with the mighty vac.
Good Luck, Pete
Wilcox has some fantastic schematics for the 1969 for trouble shooting. You will need the schematic to understand the system. If nothing else start with the beginning of the system at the intake manifold and plug off the rest of the system and see what kind of vacuum you are working with. Then move outwards through the system slowly and methodically till you find your problem. Once you are done you will have a complete understanding of the system. Keep in mind the mighty vac will test the smaller components but something as large as the vacuum tank will be a bit large to pump up by hand with the mighty vac.
Good Luck, Pete
Thread Starter
Instructor
Joined: Apr 2005
Posts: 122
Likes: 48
From: Lebanon PA
Is my vette stock?? HAHA
Joined: Oct 2015
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
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The check valve and the filter could have been damaged as well. And check the passenger fenderwell. Thats where the mechanical relay for the wiperdoor actuator is hidden. If you had the actuator off, the main line could be disconnected and that would be big enough to wipe out everything
