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#1234496 - Tue Sep 12 2017 10:07 PM Vacuum wiper normal operation?  
Greg Brown  Offline
Wrench Fetcher
Joined: Mar 2014
Posts: 25
Bellevue, WA
I have a '49 3100 with what i believe are the original vacuum powered wipers. I've always had to move the wiper switch back-and-forth manually - to one side to get them to go one way, and then to the other side to get them to go back. I just assumed that was the way these old things worked. I was at a car show this past weekend and a guy told me the wipers should go back-and-forth without having to continually move the switch. Is that information correct, and if so, does anyone have an idea why mine would work the way they do?

Thanks,
Greg


Greg Brown
'49 Chevy 3100


#1234499 - Tue Sep 12 2017 10:15 PM Re: Vacuum wiper normal operation? [Re: Greg Brown]  
Justhorsenround  Offline

Grease Monkey
Joined: Apr 2005
Posts: 3,618
Central, Oklahoma
Wiper should go back and forth without you having to constantly move the switch. Poor vacuum to motor or motor needs rebuild.🛠


Martin
'62 Chevy C-10 Stepside Shortbed
'48 Chevy Suburban Street Rod
'47 Chevy 3100 5 Window (long term project)


"I fought the law and the law won" now I are a retired one!
Support those brave men/women who stand the "Thin Blue Line" and lock up those on the wrong side of that line.

48 Burb

#1234505 - Tue Sep 12 2017 10:30 PM Re: Vacuum wiper normal operation? [Re: Greg Brown]  
69Cuda  Online
Big Bolt Forum Moderator
Joined: Dec 2015
Posts: 1,179
Seattle, Wa.
yes, they should go back and forth. Your vacuum motor may be gummed up, and/or all dried out. Make sure you have good vacuum lines going to it with no leaks, pull the motor apart and clean and lube everything, and put it back together (make sure there are no vacuum leaks). When you turn it on, you are not getting enough vacuum to move the wipers all the way up and then back down so, they stall. ONce you turn the switch back off, it pulls it back into "park" and returns the wipers to the "park" or "home" position.


Mike

1955 Chevy 6400 ex-flatbed (no bed now!)
In the Stovebolt Gallery


1958 Chevy 6400 flatbed W/dump
In the Stovebolt Gallery

1959 Chevy Suburban Owned for almost 20 years, Daily Driver -- sold May 2016
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Sufficient unto the day is the evil thereof

#1234510 - Tue Sep 12 2017 10:43 PM Re: Vacuum wiper normal operation? [Re: Greg Brown]  
tclederman  Online
Joined: Sep 2001
Posts: 25,712
Jarvisburg, NC


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 46 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.

#1234512 - Tue Sep 12 2017 10:49 PM Re: Vacuum wiper normal operation? [Re: Greg Brown]  
Greg Brown  Offline
Wrench Fetcher
Joined: Mar 2014
Posts: 25
Bellevue, WA
Thank you guys for the quick reply. I'm pretty sure I have adequate vacuum going to the motor, so it looks like I have another project for the list...

Thanks again,
Greg


Greg Brown
'49 Chevy 3100

#1234620 - Wed Sep 13 2017 03:38 PM Re: Vacuum wiper normal operation? [Re: Greg Brown]  
truckernix  Offline
Joined: Mar 2002
Posts: 8,905
Bracebridge Ontario Canada
The vacuum motor has a little switch that is activated at the end of it's travel. It switches the feed to the other side of the paddle. If that valve hangs up, it will act just as you described. I have an NOS unit for my 38 and it was doing that. I freed up the valve and it works perfectly.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!

#1234631 - Wed Sep 13 2017 06:05 PM Re: Vacuum wiper normal operation? [Re: Greg Brown]  
Greg Brown  Offline
Wrench Fetcher
Joined: Mar 2014
Posts: 25
Bellevue, WA
Thank you. That's very helpful and what I was hoping to learn.


Greg Brown
'49 Chevy 3100

#1234641 - Wed Sep 13 2017 07:32 PM Re: Vacuum wiper normal operation? [Re: Greg Brown]  
Hotrod Lincoln  Online
Boltergeist
Joined: Feb 2004
Posts: 15,193
Dellrose, TN
Look for an open port on the wiper motor that sticks out enough to attach a piece of vacuum hose. Rig up a Coke bottle of Diesel fuel with a short pierce of hose in it, turn on the wipers, and let the vacuum draw the liquid through the motor. It will clean and lubricate the wiper motor without ever having to remove it from the vehicle, and the Diesel will go through the intake manifold and clean and lubricate the valve guides before being burned in the combustion chamber. We used to use 6-ounce cans of Aviex tune up oil to rehab wiper motors that way, but Diesel will do the same job.
Jerry


The murder victim was drowned in a bathtub full of Rice Krispies and milk.
The coroner blamed the crime on a cereal killer!

Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!

#1234655 - Wed Sep 13 2017 08:53 PM Re: Vacuum wiper normal operation? [Re: Greg Brown]  
tclederman  Online
Joined: Sep 2001
Posts: 25,712
Jarvisburg, NC


Tim
1954Advance-Design.com
1954 3106 Carryall Suburban - part of the family for 46 years
1954 3104 5-window pickup w/Hydra-Matic
Z-series (54/55) GMC 350 (2-ton) COE
If you have to stomp on your foot-pedal starter, either you, or your starter, or your engine, has a problem.

#1234685 - Thu Sep 14 2017 12:01 AM Re: Vacuum wiper normal operation? [Re: Hotrod Lincoln]  
Greg Brown  Offline
Wrench Fetcher
Joined: Mar 2014
Posts: 25
Bellevue, WA
Originally Posted by Hotrod Lincoln
Look for an open port on the wiper motor that sticks out enough to attach a piece of vacuum hose. Rig up a Coke bottle of Diesel fuel with a short pierce of hose in it, turn on the wipers, and let the vacuum draw the liquid through the motor. It will clean and lubricate the wiper motor without ever having to remove it from the vehicle, and the Diesel will go through the intake manifold and clean and lubricate the valve guides before being burned in the combustion chamber. We used to use 6-ounce cans of Aviex tune up oil to rehab wiper motors that way, but Diesel will do the same job.
Jerry


This is a great example of the value of these forums. Old timer tricks like this are priceless.


Greg Brown
'49 Chevy 3100

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