vacuum question
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More Turbo
Joined: Aug 2009
Posts: 551
Likes: 19
vacuum question
Can someone tell me where the return line out of the wiper motor originally went? I have an '49 with the vacuum line going to the valve in the dash, then to the wiper motor. The other line has been plugged off. I am going to assume it went into the original oil bath air filter, which is long gone. I have an '52 which I went and looked at and it has a port in the top of the carb for the "return", which the '49 doesn't.
Where can I plumb it to so the wiper will function?
Where can I plumb it to so the wiper will function?
Logistics Pro
Joined: Sep 2014
Posts: 4,920
Likes: 21
From: Bothell & Silverdale, WA
That's a first for me. Never heard of a "return line" for a vacuum wiper motor. Mine has a vacuum line to the motor only, with a short cable from the **** that operates the control on the motor.
Laughing Gas
Joined: Oct 2012
Posts: 831
Likes: 7
From: Milford, Michigan
I'm fairly sure mine had a small felt pad on the air inlet ("vacuum exhaust") which kept dirty air from being sucked into the wiper motor or engine via the vacuum "exhaust"while running the wipers.
Logistics Pro
Joined: Sep 2014
Posts: 4,920
Likes: 21
From: Bothell & Silverdale, WA
Ditto. Held in place by a screen.
Thread Starter
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More Turbo
Joined: Aug 2009
Posts: 551
Likes: 19
OK thanks both of my other trucks have a vacuum hose exiting back through the firewall towards the carb, but not attached to anything. Evidently the exaust/inlet is plugged because the wiper motor doesn't work as I have vacuum to the motor. When I turn the valve on I can hear vacuum.
Thanks for the replies.
Thanks for the replies.
Fleet Owner
Joined: Jul 2004
Posts: 27,283
Likes: 1,046
From: NM
If the trucks originally had dual diaphragm fuel pump/vacuum pumps, there may have been two connections at the wipers?
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Logistics Pro
Joined: Sep 2014
Posts: 4,920
Likes: 21
From: Bothell & Silverdale, WA
OK thanks both of my other trucks have a vacuum hose exiting back through the firewall towards the carb, but not attached to anything. Evidently the exaust/inlet is plugged because the wiper motor doesn't work as I have vacuum to the motor. When I turn the valve on I can hear vacuum.
Thanks for the replies.
Thanks for the replies.
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Logistics Pro
Joined: Nov 2011
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From: Northville, MI
OK thanks both of my other trucks have a vacuum hose exiting back through the firewall towards the carb, but not attached to anything. Evidently the exaust/inlet is plugged because the wiper motor doesn't work as I have vacuum to the motor. When I turn the valve on I can hear vacuum.
This may help"
That is a cable running to the switch.
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