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#647167 - Mon May 17 2010 12:10 PM Vacuum Wiper Motor Rebuild  
eightfan  Offline
Wrench Fetcher
Joined: Jan 2005
Posts: 110
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.

#647172 - Mon May 17 2010 12:35 PM Re: Vacuum Wiper Motor Rebuild [Re: eightfan]  
Pete52  Offline
Shop Shark
Joined: Jan 2009
Posts: 1,774
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.


#647177 - Mon May 17 2010 01:04 PM Re: Vacuum Wiper Motor Rebuild [Re: Pete52]  
retired wrench  Offline
Shop Shark
Joined: Apr 2010
Posts: 156

I have a jar of Trico wiper grease it is about the consistancy of Vasilene,just for reference.

#647186 - Mon May 17 2010 01:44 PM Re: Vacuum Wiper Motor Rebuild [Re: retired wrench]  
truckernix  Offline
Joined: Mar 2002
Posts: 8,843
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.

1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed

My Chevy Master 4 Door is on the Road!

#647232 - Mon May 17 2010 04:48 PM Re: Vacuum Wiper Motor Rebuild [Re: truckernix]  
eightfan  Offline
Wrench Fetcher
Joined: Jan 2005
Posts: 110
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?

Last edited by eightfan; Mon May 17 2010 05:55 PM.

#647257 - Mon May 17 2010 06:01 PM Re: Vacuum Wiper Motor Rebuild [Re: eightfan]  
Huck  Offline
Shop Shark
Joined: May 2007
Posts: 283
Lake Toxaway, NC
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.

#647266 - Mon May 17 2010 06:40 PM Re: Vacuum Wiper Motor Rebuild [Re: Huck]  
cletis  Offline
Joined: May 2001
Posts: 11,334
Parker County Texas
It also helps to have water on the windshield.

"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
1954 GMC Suburban Now with a new proud owner.
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#647545 - Tue May 18 2010 06:27 PM Re: Vacuum Wiper Motor Rebuild [Re: cletis]  
Pete52  Offline
Shop Shark
Joined: Jan 2009
Posts: 1,774
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


#647658 - Tue May 18 2010 11:45 PM Re: Vacuum Wiper Motor Rebuild [Re: Pete52]  
Denny Graham  Offline
Extreme Gabster
Joined: Oct 2006
Posts: 10,612
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

#647704 - Wed May 19 2010 02:46 AM Re: Vacuum Wiper Motor Rebuild [Re: Denny Graham]  
eightfan  Offline
Wrench Fetcher
Joined: Jan 2005
Posts: 110
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!

Last edited by eightfan; Wed May 19 2010 02:47 AM.

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