Re: Questions about vacuum line on '32 901
Posted by 32model901 On 2014/12/7 11:37:02
Marston,
From what I've seen the vacuum lines and switch get plated. The pictures below show what I believe are original lines and fittings.
The vacuum switch can be tested. With the switch removed gently push on the black Bakelite button, and release it. You should now measure continuity across the two threaded terminals.
If you apply slight air pressure of 1 - 3 lbs. you should hear a snap. Remove the air pressure, there should now be no continuity between the terminals. If you gently press on the black Bakelite button again, you should feel a snap, and you should now have continuity across the terminals.
The vacuum switch is normally closed, it only opens on pressure, and is manually resettable.
I have never seen any factory / repair / or maintenance wiring diagram showing this switch.
My best guess is that it was put in to open an electrical circuit if the engine back fired. If it was wired between the ignition switch and Ignition terminal on the Startix, a backfire that may damage the starter bendix or jam it against the flywheel ring gear could be avoided.
Dave
Attach file:
(112.09 KB)
(105.76 KB)
(87.21 KB)
(92.19 KB)
(129.40 KB)
(118.00 KB)
(118.21 KB)
(106.25 KB)
(92.98 KB)
From what I've seen the vacuum lines and switch get plated. The pictures below show what I believe are original lines and fittings.
The vacuum switch can be tested. With the switch removed gently push on the black Bakelite button, and release it. You should now measure continuity across the two threaded terminals.
If you apply slight air pressure of 1 - 3 lbs. you should hear a snap. Remove the air pressure, there should now be no continuity between the terminals. If you gently press on the black Bakelite button again, you should feel a snap, and you should now have continuity across the terminals.
The vacuum switch is normally closed, it only opens on pressure, and is manually resettable.
I have never seen any factory / repair / or maintenance wiring diagram showing this switch.
My best guess is that it was put in to open an electrical circuit if the engine back fired. If it was wired between the ignition switch and Ignition terminal on the Startix, a backfire that may damage the starter bendix or jam it against the flywheel ring gear could be avoided.
Dave
Attach file:
(112.09 KB)
(105.76 KB)
(87.21 KB)
(92.19 KB)
(129.40 KB)
(118.00 KB)
(118.21 KB)
(106.25 KB)
(92.98 KB)
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