The Stovebolt Site Forums The Shop Area Interiors Vacuum Motor

My wiper vacuum has 4 ports. One has a red plug, Where do the 3 go?. 1/4 tubing?

BD, If you don’t mind I’d like to add a couple questions about vacuum wiper motors.
This is on a Trico unit and I could not find a model number.

1. What are those little rectangle bolts called? They are 1/8th wide X 3/16 long with rounded ends. You can see a couple in one of your pictures on the cover plate.

Edit: I found an answer for my second question. Finken Service co.

Thanks
Don

This could help.

That helped some. But a different setup.

This may be easier. Red yellow blue...where do they go? thanks all!

Do you have an FSM? If not, I will try and remember to look it up in mine tonight.

Shop manual? No help there.

I did find this bolt for the fuel pump for vacuum. That and the manifold?
The 3rd for clean air? Also found an original length wiper hose. Its cracked and unusable
but bent for fitment.

I actually meant FAM (Factory Assembly Manual). Words are hard today...

I will look tonight.

This is what the assembly manual has.

Maybe try rotating it around to look for something that matches this position?

I suspect the others are the washer hookups, but I can't find that in my manuals.

Thanks. But this is confusing and I don`t know why. What would rotating it do? I am not getting something here.
There are 4 ports on this motor. Is that odd? One is plugged with a red plug and others are open.
What needs to be so I can check to see if it works. No manuals show this and no help on line.
So???

BD, Just a note here that your topic is probably best continued in the Interiors forum as that the most on-topic place for your wiper motor question, so it’s been moved there for further discussion and help.

That being said, I may have found some helpful info, but since I’m working from my phone right now it will have to wait until tomorrow when I can get back to my laptop. Hope to help you clear some of the murky waters soon.

Thanks. I put it in the engine part cause when I searched the stovebolt on the topic, that s where all
the threads were.

This is as close I as can find. Lot of confusion on using the washer function that makes it difficult.
Mine did not have that. This cropped photo is what I was looking for. Check valve is what is plugged on mine. The open
port in the middle by the looks of it never had anything on it and the diagram shows that as well. That my wiper motor there.
My question is can I use the vacuum there at the fuel pump? Then return at the manifold?

This should help someone. Real simple. Vacuum pump would mean carb or fuel pump vacuum.
Take pics!! Here are some pics of the engine and showing the hanging hose for the
manifold and what looks like a hard line turning into rubber from the fuel pump.

This pic you can see the 1/4 tubing from the fuel pump going into the firewall.

First thing tomorrow I will run hoses for the wiper motor. Does anyone have a tip
as to adding grease to the motor? White lithium or ?. thanks!

Don't take it apart. There is only one person on the planet who has the correct gaskets for them, but he needs them for his wiper restoration business. If you find that yours is weak, contact him. He goes by Wiperman and will make yours run like new.

Trico wiper motor rebuilder and parts sales

The Wiperman
132 Calvert Ave
West Babylon, NY 11704
(631)587-3332 M-F 9-5 EST
http://www.wiperman.com/

I have rebuilt four or five of them for '37, I was making a mirror image set so both wipers parked in the center. It took several different motors to get the parts needed. With that said, I cut my own gaskets using the originals as patterns. It's not all that hard if you take your time and have a sharp knife. To get them apart, I used a brass tube pinched down to form an oval that fit over the screw heads. You can replace them with standard screws since they are a standard thread, just can't remember just what size they were. A couple of the ones I pulled apart had usable gaskets, I soaked them in oil to soften them. The motor worked just fine after a cleaning and oiling with all the original parts. A light polish on the inside helped with slow speed, as mine have twist valves to limit the vacuum for speed control.

White motor assembly grease works really good to soften the seals inside. If it's not totally dried out, some light oil will also help, just put some down the inlet and outlet tubes and work the motor back and forth easy. If you can find a small vacuum pump, working on you bench is a lot easier then monkeying around in the overhead of the truck.

Joe

I have wipers. No problems. I used some transmission fluid as a lube.
Worked up a vent tube with copper water line. Flared the inside. vacuum from the fuel pump bolt.
Run hose and lubed the wiper barrels so they would turn. Worked right off.

One thing of note ,with the vacuum open w/o hose at intake , truck ran but a little rough.
I fiqure it was running rich until I put the hose on to seal up vacuum. Before, I crimped that steel tube.

Vacuum motor runs fine. One speed and returns to zero when you turn it off.
My problem is when I added the wiper arms. With them off I cannot hold the cam from turning
on the outside with my fingers but when I add the wipers it moves them about half way. Will return back to 0 when off.
Is there too much pressure on the wiper to glass? I have the glass with water on it to test.
Can that spring be adjusted?

My vacuum wiper did the same thing. After soaking with ATF, it seemed to work but adding the arms stopped it in it’s tracks. I suspect the seals are a bit worn and your wiper motor needs a rebuild. I sent mine to the WiperMan, and now it works on dry glass!

I have taken the arm apart and removed the spring and drilled a new hole in the metal where one end of the spring attaches. This results in less tension on the windshield.
The spring which they put in these aftermarket wiper arms are not up to specs. Too strong or just a tad too short.

I think I would agree. having these other two with the same wiper arm, I can feel the
resistance on the older aftermarket ones. One is really less and the others are less. No doubt this motor
needs a rebuild. Trying to fiqure if I can at the moment. Cost wise.
But you can look at the pic, both arms are bent inward from pressure.

I might as an experiment, take a set from another truck that feels less resistance to the glass and
put those on the vacuum motor.

Closer observation I can see a difference in the pressure on the glass.
My black 58 has what I would guess are the original arms or at least a early repop.
The arms are not bent and are thicker and will not bend like the current reproductions.
Arms on my 59 are bent inward. Bowed from pressure.

You can always just switch the arms from the 58 to see if it makes any difference.

Yep, thats the plan. QUOTE; I might as an experiment, take a set from another truck that feels less resistance to the glass and
put those on the vacuum motor.

Update. I ordered a new motor from the wiperman. Works great but now my engine
has developed a sputtering backfire. Cranks and idles fine, adding throttle constant it backfires. Any clues?

I would post that issue in the Engine Forum.

On my old 235 there is a hard line running from the Vacuum pump(Fuel pump) to the
engine and runs along the valve cover, then turns rubber again to the firewall. Looks original, is it?

It's possible that the vacuum part of the fuel pump has a broken diaphragm and is causing a vacuum leak and engine backfire. I would test to be sure it's OK.

Thanks. Vacuum not contained in the fuel pump. Hollow mounting bolt pulls vacuum from the engine crank case...?
Everything good. i just wondering if that setup with the hard line is original. I could eliminate alot of rubber hose.

So you don't have a combo fuel/vacuum pump? Like pictured. The top part pumps fuel, and the bottom pump boosts vacuum to wiper motors, etc.

I've never seen a vacuum line connected to the crankcase. Not sure what that would accomplish.

This bolt mounts the fuel pump and has a hose fitting. It was on my truck originally
Wipers work. IDK. I just go with what I have. I do not have that fuel pump

The red-marked port needs to stay open to the atmosphere. All it does is draw air from inside the cab as the vacuum powers the flapper inside the wiper motor. You definitely DO NOT need the hollow bolt or the hard line to the pump.
Jerry

this is correct?

So aside from buying a different fuel pump with a diaphragm , where else can I pull vacuum from?

Originally they would have a rubber hose running from the firewall to the fuel pump diaphragm portion? Thats alot of hose.
My motor has stamped on the ports backside... VT and MAN. Fresh air comes from the green line (port furthest passenger side.)
Red in the pic above is for the washer

The fitting in the middle of the intake manifold- - - -the same place millions of stovebolts have used since the 1930s.