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Old 04-03-2020, 11:26 AM   #21
glennpm
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Default Re: What lube for '39 vacuum wiper motor?

Thanks Pete, those are directions I posted above in the link. I was looking for these from redmodelt:

“The instructions I have see say to use brake fluid.”
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Old 04-03-2020, 11:27 AM   #22
Clem Clement
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Default Re: What lube for '39 vacuum wiper motor?

I use ATF in the side tiny breather hole.
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Old 04-03-2020, 11:45 AM   #23
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Default Re: What lube for '39 vacuum wiper motor?

If I can find it again I will post the instruction sheet from Trico.

https://www.fordbarn.com/forum/showthread.php?p=1464034
I also found this, but remember that the Model A had the wiper over the windshield on the out side where it could drip onto the cowl;
https://www.mafca.com/downloads/Tech...um%20Wiper.pdf
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Old 04-03-2020, 12:03 PM   #24
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Default Re: What lube for '39 vacuum wiper motor?

Neats-foot oil is an old time leather dressing used to soften, waterproof leather.
Disconnect the hose from the wiper motor, put a few drops of neats-foot oil into the motor, cycle it back and forth a few times to spread the oil around within the housing.
In the States neats-foot oil would be found in a farm/home store, the same is probably true in Russia..
ATF might be alright, however, ATF is designed for rubber/neoprene seals, might not be good for leather. WD-40 would be the worst thing to put into a wiper motor.
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Old 04-03-2020, 12:15 PM   #25
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Default Re: What lube for '39 vacuum wiper motor?

Vacuum Wiper Motor Service https://www.fifthaveinternetgarage.c...ors_update.php


When you took you car in for service in those days part of the "check-up" involved servicing the vacuum wiper motor.

The mechanic would remove the vacuum wiper hose from the engine manifold and hold it up in the air above the height of the dash and squirt brake fluid into the hose using an oilcan. The brake fluid would run down inside of the hose to the inside of the vacuum motor. Reconnecting the hose and turning on the wiper motor with the engine running would circulate the brake fluid inside of the vacuum motor and soften the leathers inside of the vacuum motor.

The final job was to be sure the brass intake screen on top of the vacuum motor was free of dirt and dust. The mechanic would use an air hose and pointed air hose nozzle to blow the screen clean. Then as now the cause of most vacuum wiper motor failures is lack of use.

You can try to revive an old vacuum wiper motor by removing it from the car and soaking it in a coffee can full of brake fluid for a day or two. That will soften up the leather bellows inside of the vacuum motor. Depending on their condition you might bring them back to life. If the leathers have been dried out for too long and are cracked and separated, then there is not much hope and you will have to send the vacuum motor off to get rebuilt.

And just so you know…then as today, 37 miles per hour is the speed at which bugs begin sticking to the windshield instead of glancing off.
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Old 04-03-2020, 01:03 PM   #26
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Default Re: What lube for '39 vacuum wiper motor?

Thanks Pete, very helpful information on wipers.
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Old 04-03-2020, 02:29 PM   #27
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Default Re: What lube for '39 vacuum wiper motor?

Thanks everyone for sharing your knowledge!
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Old 04-05-2020, 05:25 AM   #28
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Default Re: What lube for '39 vacuum wiper motor?

Moonraker. This may not be applicable to your car, but I had a problem with the wipers not working properly on my '46 Coupe. I had the motor apart cleaned, oiled, tinkered, and talked to myself a bit, but still slow or not working. I was lucky when a fellow Barner offered and sent me the low usage motor from his car, which was stronger than mine. I installed it, but still not good enough to take the car out and get caught in the rain. More work/research showed two issues. The first, was that one of the wiper shafts, where it comes through the housing on the cowl was almost seized, so it was very stiff to turn. The second issue I found was that a previous owner had installed aftermarket wipers and wiper arms, and the spring tension on the wiper arms applied too much down force, creating more resistance than stock arms do. Freed up and lubed the shafts, installed correct wiper arms and all is good. Just don't try to pass that Corvette when it is raining.
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Old 04-05-2020, 06:14 AM   #29
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Default Re: What lube for '39 vacuum wiper motor?

51woodie - thanks! Luckily, my situation is not so severe, it just needs lube
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