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#647167 - Mon May 17 2010 07:10 AM Vacuum Wiper Motor Rebuild
eightfan Offline
Wrench Fetcher
Registered: Tue Jan 04 2005 12:00 PM
Posts: 110
Loc: Meadville, MS
Anybody rebuild vacuum wiper motors to include the paddle seal inside? I have a Trico out of my '53 3100 that I took apart, cleaned and lubricated, but I still don't get any action. Thanks in advance.
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#647172 - Mon May 17 2010 07:35 AM Re: Vacuum Wiper Motor Rebuild [Re: eightfan]
Pete52 Offline
Shop Shark
Registered: Tue Jan 06 2009 10:40 AM
Posts: 1689
Loc: melrose pk. il.
Wiper Man ,rebuilds them but You have to send it to him,did you use a very lite grease,I'm right now cleaning and lubing My third one I'm going to post the pic's later today maybe that will help.

Pete
_________________________
1952 Chevy 3100
In the Stovebolt Gallery
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#647177 - Mon May 17 2010 08:04 AM Re: Vacuum Wiper Motor Rebuild [Re: Pete52]
retired wrench Offline
Wrench Fetcher
Registered: Sun Apr 25 2010 01:43 PM
Posts: 155
Loc: Indiana

I have a jar of Trico wiper grease it is about the consistancy of Vasilene,just for reference.
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#647186 - Mon May 17 2010 08:44 AM Re: Vacuum Wiper Motor Rebuild [Re: retired wrench]
truckernix Offline
Registered: Sun Mar 24 2002 12:00 PM
Posts: 8305
Loc: Bracebridge Ontario Canada
I had the one on my 51 apart several years ago and it was quite simple. However, the one on my 38 Chevy has a very complicated valve unit on it. In Hemmings there are two places advertising rebuilding services. The most prominent, I think it is Wiperman charges $100 and the other one charges $67. Wiperman seems to be setup for custom shipping etc.
_________________________
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#647232 - Mon May 17 2010 11:48 AM Re: Vacuum Wiper Motor Rebuild [Re: truckernix]
eightfan Offline
Wrench Fetcher
Registered: Tue Jan 04 2005 12:00 PM
Posts: 110
Loc: Meadville, MS
After a little more troubleshooting.....I found that I get good side to side action from the motor without the wiper arms attached at the windshield....if I put slightly more than finger tip pressure on the serrated shaft, the action stops........any ideas on what the problem is?


Edited by eightfan (Mon May 17 2010 12:55 PM)
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#647257 - Mon May 17 2010 01:01 PM Re: Vacuum Wiper Motor Rebuild [Re: eightfan]
Huck Offline
Shop Shark
Registered: Fri May 25 2007 12:00 PM
Posts: 239
Loc: Alpharetta, GA
I recently purchase some spare wiper parts on EBAY including wiper arms and the hub or unit that bolts into the cowl. It was real stiff and the arms would only turn with a lot of force. With just a little oil on the shaft where it passes through hub they loosened up and now turn freely.
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#647266 - Mon May 17 2010 01:40 PM Re: Vacuum Wiper Motor Rebuild [Re: Huck]
cletis Offline
Registered: Sat May 19 2001 12:00 PM
Posts: 10451
Loc: Parker County Texas
It also helps to have water on the windshield.
_________________________
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1956 Chevy 1/2-ton 3100
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#647545 - Tue May 18 2010 01:27 PM Re: Vacuum Wiper Motor Rebuild [Re: cletis]
Pete52 Offline
Shop Shark
Registered: Tue Jan 06 2009 10:40 AM
Posts: 1689
Loc: melrose pk. il.
I just cleaned and relubed this unit and took some pics.

I hope this helps and gets more good wiper action going

http://s559.photobucket.com/albums/ss39/sparky52/trico%20cleaning/

Pete
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1952 Chevy 3100
In the Stovebolt Gallery
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#647658 - Tue May 18 2010 06:45 PM Re: Vacuum Wiper Motor Rebuild [Re: Pete52]
Denny Graham Offline
Extreme Gabster
Registered: Mon Oct 02 2006 12:00 PM
Posts: 10035
Loc: Sandwich, IL
Retired Wrench, think you could post a picture of that jar of Trico grease for us to see???? Iíd like to add that to my reference library, tks.

Eightfan, like the man said, these are pretty basic vacuum motors, yo problem is a vacuum leak most likely at the piston.
Once the seals wear out and allow any vacuum leak at all, there isnít much you can do with them, all the grease in the world isnít going to make it work any better. Vacuum devices have to be absolutely vacuum tight because they operate in a very narrow band of negative pressure. Absolute perfect vacuum is only about 30inHg. If your engine is in top-notch shape it will only pull about 22inHg. If your vacuum motor and system had a perfect seal it would only be capable of producing approximately 25 to 30lbs of force on the paddle at this level of vacuum and this does not take into account any of the friction drag produced in the motor, linkage, transmissions or wiper blades.
Unfortunately the few re-builders have bought all of the Trico surplus parts up so they have a corner on the market. None of them that I have contacted will sell any parts and a new paddle is the only thing that will seal properly. Iíve not been able to find a material that would work as a replacement. The seal is a woven fabric that is impregnated with something, which I have been unable to identify. As close as I can figure the was some sort of grease possibly with graphite in it.

I have a Welch vacuum pump used for evacuating high vac systems that will pump down to 10-3rd or about .001 atmosphere, I use that to test a vacuum motor after Iíve restored it. Even at that high of a vacuum often the old paddles donít seal enough to produce a lot of torque so you couldnít expect the vacuum from an internal combustion engine to drive it.
There really was a reason that the industry went to electric wipers!

Denny Graham
Sandwich, IL
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#647704 - Tue May 18 2010 09:46 PM Re: Vacuum Wiper Motor Rebuild [Re: Denny Graham]
eightfan Offline
Wrench Fetcher
Registered: Tue Jan 04 2005 12:00 PM
Posts: 110
Loc: Meadville, MS
The operation of the thing is clear to me now.....the paddle is definetly going to be my problem. I noticed that the edge of the paddle seemed to have gotten dry and crumbled a little as I cleaned it. I may just have to bite the bullet and send it The Wiper Man. $100 bucks for an inspection sticker! Ouch!


Edited by eightfan (Tue May 18 2010 09:47 PM)
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