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Old 11-13-2012, 09:56 AM
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How to test vacuum wiper motor?

Is there a way to test a vacuum wiper motor without having the engine running?
Thanks,
Tom

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Old 11-13-2012, 10:11 AM
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Quote:
Originally Posted by T Evans View Post
Is there a way to test a vacuum wiper motor without having the engine running?
Thanks,
Tom
I used a different vehicle if this is why your asking. A vacuum pump can be used but they are costly for individual use.

Hope this helps.
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Old 11-13-2012, 11:19 AM
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Get this: Brake Bleeder and Vacuum Pump Kit Also handy when you do a brake job.
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Old 11-13-2012, 05:47 PM
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How about simply finding a running motor and try it? You have a giant vacuum pump sitting under the hood of every car you own.

A little oil inside of them will do wonders by the way. I have run the original vacuum motors in a few daily drivers over the years.

Brian
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Old 11-13-2012, 09:18 PM
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The way I used to do it was to take the wiper, attach a hose to it and suck on the end like crazy (sort of like sipping on a straw). If the wiper moves to one side then you now have an idea that it will work. Doesn't take much vacuum to move it unless it's all gummed up. Did it many times, years and years ago and this procedure never failed me. I think it would be different if you were a smoker.
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Old 11-14-2012, 08:20 AM
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Quote:
Originally Posted by 27Tall T View Post
The way I used to do it was to take the wiper, attach a hose to it and suck on the end like crazy (sort of like sipping on a straw). If the wiper moves to one side then you now have an idea that it will work. Doesn't take much vacuum to move it unless it's all gummed up. Did it many times, years and years ago and this procedure never failed me. I think it would be different if you were a smoker.
This is true, I have done that and you have enough vacuum to do it.

Brian
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Old 11-14-2012, 11:14 AM
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Since the popularity of political threads on the forum has been on the rise here is a solution,hook it up to a politician,we all know they suck!
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Old 11-14-2012, 11:26 AM
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if the wiper completely stops whenever you need it most.
the vacuum wiper system is funtioning properly.
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Old 11-15-2012, 09:01 AM
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Thanks to all for the ideas. I'll probably just hook it up to a running vehicle, guess that was just too obvious for me to see. Tom.
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Old 11-15-2012, 11:21 AM
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And again, these vacuum wipers work GREAT. People get all swapping in their head and pull them out because there's something wrong and all it needs is a little oil or light grease to get them going. I have them in the Rambler for instance, they hadn't ran in decades. Pulled the motor out, pulled it apart cleaned out all the hardened old grease and re-greased it, works perfect every day for me.

I even bought an NOS Trico rebuild kit for my truck years ago and rebuilt the thing, that sucker went TOO fast! I literally would not turn the knob all the way on under most rains. On that truck I also added a vacuum reservoir from an early 60's GM car. They had them under one of the front fenders. It was a large Tylenol capsule looking thing. A sealed metal can with on pipe nipple is all you need. Simply run that hose to a T in your vacuum system and wham, you have back up vacuum for your power brakes and wipers. Works like a charm.

Brian
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Old 11-18-2012, 12:54 PM
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Vac wipers get a bum rap because people can't seem to understand that a 30-50 year old motor is worn out. It costs less to put in a rebuilt vac motor (that will last another 40-50 years -- new materials and lubes are better than the original) than to switch to electric, and loads less trouble. If you have a good engine with a good street cam (a "lumpy" cam won't create as good vacuum) they will be as strong as electric wipers.

All vac wiper cars used a vacuum booster fuel pump to create better vacuum under low engine vacuum conditions, such as accelerating. If not using one you need a large vacuum storage cannister as Brian described. You can find them in 90s Ford trucks that look like a 1/2 gallon juice can. One of those will keep the wipers from stalling during acceleration, but they will slow down. The booster pump created no (or very little) vacuum at idle, only at high rpm (where it's needed).
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Old 11-18-2012, 01:45 PM
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I forgot to mention that Frank, many cars with vacuum wipers have a "Duel diaphragm" fuel pump that creates vacuum for your wipers.

But honestly, I have pulled them apart and oiled them leaving them working fine for years.

Brian
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Old 11-18-2012, 04:10 PM
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How well that works depends upon the condition of the seals and valve in the "flapper". You can usually rejuvenate an old vac wiper motor to work better than it did, but it rarely has the power it did when new. Even a downpour won't stall a new vac wiper motor as long as the engine is in good condition (creating good vacuum). I've brought a few back to life for a while in late 50s/early 60s Ramblers. Most of the time that only lasts six months to a year. They used a leather seal back then and it usually cracks with age. A lot depends on how long it's sat up as well. A motor that has sat unused for 10 years is more likely to have dry cracked seals than one that hasn't sat as long and has seen some use.
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Old 11-18-2012, 09:10 PM
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My parts car that I pulled the motor out of for my Rambler had a perfectly operating wiper motor when I fired the motor for the first time in 20 years. I got the motor running and the wipers were on, working like a charm!

I don't know, like I said I have had good luck with them. But I sure can see where they could be funky I pulled mine apart to grease it up and I saw that leather flap, it certainly would be a lot more susceptible to drying out and cracking more than the rubber one in my truck.

Brian
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