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Username Post: Hose Routing - Vacuum Wipers        (Topic#308050)
RAM_51 
Silver Supporting Member
Posts: 4616
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
02-08-14 01:09 PM - Post#2424875    

There has been some discussion here lately about the correct routing of the vacuum windshield wiper hoses. I have taken some of the Chevrolet information and images [manipulating some] from various places and decided to put this informative thread together to help clarify and or de-mystify the hose routing for the vacuum wiper system on our cars.

There are three types of hose routings:

1) the basic wiper set-up
2) the wiper set-up with the accessory fuel pump vacuum pump
3) the vacuum wiper set up with the accessory vacuum operated windshield washer. (This set-up requires a separate switch that has two vacuum ports and the capability of operating the washer pump)

1) THE BASIC SYSTEM:
It is easiest to think of the wiper motor as the starting point and the manifold as the ending point when running the hoses for the vacuum wiper systems. With the basic system the hose comes directly off of the wiper motor, travels through the dash panel more commonly called the firewall, and goes directly to the intake manifold. This hose is usually attached to a fitting on the manifold but can be used with a wiper manifold silencer as well.


THIS IS THE SWITCH OF THE BASIC SYSTEM. IT CONSISTS OF NOTHING MORE THAN A CABLE ATTACHED TO THE TURNABLE KNOB AT THE DASH.


BASIC HOSE ROUTING FOR NON-WASHER SYSTEM. WIPER MOTOR VACUUM HOSE WOULD SIMPLY BE ROUTED TO INTAKE MANIFOLD OR TO INLET ON VACUUM PUMP IF THAT SYSTEM IS USED...see 2) VACUUM PUMP SYSTEM.


A MANIFOLD SILENCER CAN BE USED AS SHOWN ABOVE, OR YOU CAN SIMPLY USE A BRASS FITTING TO MAKE THE CONNECTION BETWEEN HOSE AND MANIFOLD.






2) THE ACCESSORY VACUUM PUMP SYSTEM:
Here again, think of the wiper motor as the starting point. The hose is routed from the wiper motor through the firewall to the INLET on the vacuum pump below the fuel pump. The hose then exit’s the OUTLET of the vacuum pump and goes to the intake manifold. Incidently, I have found that making the run from the firewall to the vacuum pump and from the vacuum pump to the intake manifold with metal tubing to be a good way to do this. It is impotant to note also that just like the basic system, it it easiest to think of he wiper motor as the starting point and the intake manifold as the end point.


FUEL PUMP WITH ACCESSORY VACUUM PUMP. THE HOSE WOULD COME FROM WIPER MOTOR AND ENTER THE INLET ON THE VACUUM PUMP AND EXIT ON THE OUTLET SIDE AND GO TO THE INTAKE MANIFOLD. NOTE: ONLY ONE PORT ON THE VACUUM PUMP SHOWN.


THIS PHOTO SHOWS THE ROUTING OF METAL TUBING FOR THE ACCESSORY VACUUM PUMP SYSTEM. RUBBER HOSE FROM WIPER MOTOR TO METAL TUBING TO INLET IN VACUUM PUMP. METAL TUBING FROM OUTLET ON VACUUM PUMP TO FITTING ON INTAKE MANIFOLD. ALTHOUGH IN THIS PHOTO IT DOES LOOK LIKE THE VACUUM PUMP OULET TO INTAKE MANIFOLD TUBE IS NOT CONNECTED.




3) ACCESSORY WINDSHIELD WASHER SYSTEM:
This is really just an addition to either one of the above systems…and the only thing different is that there needs to be a way of getting vacuum to the switch. The switch itself is different also in that it has a push button that actuates the washer pump that is either inside or on top of the washer jar. The vacuum is provided by placing a “T” or “Y” fitting in the vacuum hose that normally supplies the wiper motor with vacuum. This additional hose then goes to the switch. Another hose comes off of the second port on the switch and travels to the pump at the washer. When the switch at the dash is pushed, vacuum is supplied to the pump and water or fluid is drawn into the pump. A third hose then comes from the outlet on the pump and supplies windshield washer fluid or water to the nozzles at the base of the wipers.


ACCESSORY WIPER KNOB WITH VACUUM PORTS REQUIRED TO OPERATE WINDSHIELD WASHER PUMP.


ROUTING OF VACUUM HOSES FOR THE ACCESSORY WINDSHIELD WASHER SYSTEM.

1951 Fleetline
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
Keith_Knox 
Moderator and "16th Year" Gold Supporting Member
Posts: 5697
Keith_Knox
Age: 76
Loc: Napa, Ca USA
Reg: 04-02-00
02-08-14 01:29 PM - Post#2424883    
    In response to RAM_51

Good info. Anyone got the same for a 42-48?

1948 Chevy Fleetmaster Coupe Purchased 6/2010. Stock with rebuilt 52 216 installed May 1966.
1946 Chevy 1/2 ton pickup, stock. Purchased 11/18/17.
1962 Ranchero Purchased 4/2017 221 V8 Automatic.
2013 F150 Crew Cab


Edited by Keith_Knox on 02-08-14 01:30 PM. Reason for edit: No reason given.

 
pearljam724 
Contributor
Posts: 761
pearljam724
Age: 41
Loc: SW Pennsylvania
Reg: 01-27-14
03-11-16 05:49 PM - Post#2614715    
    In response to RAM_51

Thanks, ram. For pointing this all out to us. I always wondered why I have a brass fitting connected to my manifold while others have that round silencer. I thought that it was just the factory fitting that my car was missing. I wonder if those silencers are available anywhere ? I've never seen them on eBay available by themselves either.

http://i420.photobucket.com/albums/pp282/pearljam 7...


 
RAM_51 
Silver Supporting Member
Posts: 4616
RAM_51
Loc: Yakima, WA. USA
Reg: 12-28-02
04-10-16 09:32 PM - Post#2620848    
    In response to pearljam724

Honestly I've only seen the silencers on used manifolds or on nicely preserved Chevs of the period. I don't remember ever seeing an NOS one. I'm not ever sure what they would even be silencing.

1951 Fleetline
'51 Fleetline DeLuxe 2 DOOR SEDAN (Fathom Green)
'51 Styleline Special BUSINESS COUPE (Shadow Gray)
'53 6500 Dump Bed (Oxidized Red)
'50 Styleline DeLuxe 4 DOOR SEDAN (Mist Green)


 
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