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Grant
Samba Member
Joined: September 25, 2004
Posts: 820
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 Posted: Sat Jan 08, 2005 5:42 pm Post subject: Wiper test |
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hello, i got my bus and it came with a wiper motor but i dont konw if its 12 or 6V i looked for a stamping but no luck.
Also, it's definatly used so i'm wondering if it was bad and the PO took it out or did he buy a used one to put in. so how can i test it out before puting it in my bus? wish i could post some pics but no camera
(yet)
-Grant |
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Eric&Barb
Samba Member
Joined: September 19, 2004
Posts: 26062
Location: Olympia Wash Rinse & Repeat
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| Posted: Sat Jan 08, 2005 7:02 pm Post subject: Re: Wiper test |
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Hi Grant,
Would help to know what year bus and what voltage you are trying to run! As for testing you can hook up some temporary wires and see what it does. If the motor really spins like crazy on 12 volts it most likely is a 6 volt motor. If barely or not at all spinning on 6 volts it probably is a 12 volt unit.
Either way if the wiper motor runs, make sure to take apart the wiper gear box. Remove the OG grease that by now has turned into something more like a non-lubricating puddy. Refill only about 1/3 full with a light grease like lithium or perhaps white lithium.
Eric&Barb |
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Grant
Samba Member
Joined: September 25, 2004
Posts: 820
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| Posted: Sat Jan 08, 2005 8:53 pm Post subject: Re: Wiper test |
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| Eric&Barb wrote: |
Hi Grant,
hook up some temporary wires ................................................................. if the wiper motor runs, make sure to take apart the wiper gear box.
Eric&Barb |
mmm hmm. i think i can figure out the second one but the first, i'm not sure
but thanks for the help
-Grant |
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Kaput
Samba Member
Joined: December 12, 2002
Posts: 859
Location: Lakewood, CO
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| Posted: Sun Jan 09, 2005 1:10 am Post subject: |
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ground it on one of the bottom screws(to some good ground on yer bus), then touch a hot wire to each of the posts. One of em should make it go. If it makes a loud ZZZZZZZZZZZZZZ hum its 6 volt (on a 12 v system) low buzz its a 12 v motor.
if its 6v it will really sound like its overworkin the motor.
I am assuming u are testing on a 12 v battery.
good luck |
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scottydub
Samba Member
Joined: May 30, 2003
Posts: 112
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| Posted: Thu Jan 21, 2016 1:39 pm Post subject: Re: Wiper test |
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| When you say ground it, are you talking about grounding the wiper assembly to the car or is there a ground terminal? I have this same issue and it's not installed in the bus. |
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Eric&Barb
Samba Member
Joined: September 19, 2004
Posts: 26062
Location: Olympia Wash Rinse & Repeat
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| Posted: Thu Jan 21, 2016 2:01 pm Post subject: Re: Wiper test |
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All wiper motors cause a vibration. This vibration causes noise when directly connected to a body panel that acts like a speaker cone. To eliminate this conduction of vibration to the body VW installed various pieces of rubber. Rubber does not conduct electricity at all well, so a ground wire is required when installed.
With a motor out of situ you can often just touch the wiper motor body to the ground of the body.
Just be careful of moving parts and your fingers.....
A ground wire in that situation is often a lot easier to deal with.
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In Stereo, Where Available! |
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scottydub
Samba Member
Joined: May 30, 2003
Posts: 112
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| Posted: Thu Jan 21, 2016 2:53 pm Post subject: Re: Wiper test |
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| When i got the bus, the wiper assembly was removed and sitting in the back. I hooked a ground wire to one of the little bolts on the body and touched a hot wire to each of the 4 terminals. It buzzed at a different frequency at each terminal, but no movement. I opened up the motor and the grease had turned to glue. What should i use to clean it with? What type of grease should i replace it with? Thanks |
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scottydub
Samba Member
Joined: May 30, 2003
Posts: 112
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| Posted: Thu Jan 21, 2016 3:10 pm Post subject: Re: Wiper test |
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| ...and the little cone shaped piece sits on the tip of the armature when reassembled? |
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mcdonaldneal
Samba Member
Joined: June 13, 2013
Posts: 2731
Location: Gullane, Scotland
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| Posted: Thu Jan 21, 2016 3:17 pm Post subject: Re: Wiper test |
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This might give you an idea of what you're facing...
I'll link to a good wiper refresh thread too, for a later bus but helpful anyway.
| mcdonaldneal wrote: |
While the wiper motor is out I gave it a good clean up. The old grease that was in there was very thick and almost solid so, I cleaned it all out, re packed with fresh, lighter grease, cleaned up the contacts and greased them and the metal contact plate with dielectric grease. Then cleaned and greased the shafts. You can see the two-piece rubber seals have let in water and the shaft assemblies were quite corroded, so I cleaned them up with a wire wheel and I'll paint the ends of the frame.
The park position can be checked using a small 9v square battery, once you work out the wiring!
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mcdonaldneal
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Joined: June 13, 2013
Posts: 2731
Location: Gullane, Scotland
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scottydub
Samba Member
Joined: May 30, 2003
Posts: 112
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| Posted: Thu Jan 21, 2016 4:19 pm Post subject: Re: Wiper test |
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| This is great, thanks! I have the same motor. |
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mcdonaldneal
Samba Member
Joined: June 13, 2013
Posts: 2731
Location: Gullane, Scotland
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| Posted: Fri Jan 22, 2016 3:24 am Post subject: Re: Wiper test |
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Blah, blah. More pics from my thread.
Hope they help.
| mcdonaldneal wrote: |
Ok. On request I'll post some pictures of the whole wiper motor cleanup. It's probably not comprehensive, as I did over a period of a few weeks, and it doesn't include taking the electrical motor apart. (When I took the Kombi motor apart it was clean as a whistle, and the Ghia motor had been working ok. (Plus that bit was by far the fiddliest step!)
Once everything was disassembled (mostly obvious), I took the plate off that covers the gearbox (five screws). The grease was dark and hard, so I scraped it all out and cleaned with paraffin (kerosene). The large white plastic gear will just push out once the screw and arm on the end of the shaft are removed.
This might be a good point to explain the wiper parking position logic. The White gear has inner and outer tracks. The inner one is continuous, so when it gets power the wipers run continuously. The outer one has a gap in it and is constantly live. So, when the wiper switch is turned off, the wipers carry on running until the copper contact hits the gap, when it stops (the park position).
I repacked with lighter multipurpose grease, mainly the worm gear and the teeth of the White gear. At least except the metal plate on the White gear and the copper terminals, which got a thin smear of dielectric grease.
When the motor is reassembled, you can bench test it with a square 9v battery. Negative to the ground tab on the case, and then positive to the 53 or 53b terminal. The motor should run. Then change the positive to the outer track (53a terminal) and the motor should run and then park. The arm is supposed to be at 90degrees to the electric motor case in the park position, so adjust it so that it is. (Sadly, I can't tell you whether it should be to the left or the right, but I think it is as shown here!) 
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1978 marino yellow Bay Dormobile camper
1969 signal orange Karmann Ghia convertible
1976 martini olive Bay Dormobile camper
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scottydub
Samba Member
Joined: May 30, 2003
Posts: 112
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| Posted: Sat Jan 23, 2016 4:46 pm Post subject: Re: Wiper test |
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| A few of the plastic gear teeth on the wheel got broken, when it locked up. Otherwise. it all looks good. Is there a source to replace the gear wheel or whatever it's called? |
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mcdonaldneal
Samba Member
Joined: June 13, 2013
Posts: 2731
Location: Gullane, Scotland
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| Posted: Sat Jan 23, 2016 5:27 pm Post subject: Re: Wiper test |
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| scottydub wrote: |
| A few of the plastic gear teeth on the wheel got broken, when it locked up. Otherwise. it all looks good. Is there a source to replace the gear wheel or whatever it's called? |
Not sure about that. The usual problem seems to be the plastic cracking where the shaft meets the plastic gear wheel, which can be strengthened.
I would guess that if one or maybe two teeth are broken that the gear might still work, as the worm gear will bridge the gap. The test under battery power will give you a clue.
If the plastic gear wheel is buggered, then your best bet is probably cannibalising one from the classifieds (or a replacement motor!)
Good Luck.
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1978 marino yellow Bay Dormobile camper
1969 signal orange Karmann Ghia convertible
1976 martini olive Bay Dormobile camper
Stop dead photo links! Post photos to The Samba Gallery! |
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Eric&Barb
Samba Member
Joined: September 19, 2004
Posts: 26062
Location: Olympia Wash Rinse & Repeat
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| Posted: Sat Jan 23, 2016 6:26 pm Post subject: Re: Wiper test |
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| scottydub wrote: |
| A few of the plastic gear teeth on the wheel got broken, when it locked up. Otherwise. it all looks good. Is there a source to replace the gear wheel or whatever it's called? |
Sure there is, just get another wiper motor....
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cdennisg
Samba Member
Joined: November 02, 2004
Posts: 20845
Location: Sandpoint, ID
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| Posted: Sat Jan 23, 2016 11:35 pm Post subject: Re: Wiper test |
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Wow, an eleven year old thread resurrection. Very nice.
Wiper motors are a pretty simple contraption, really. Once you take it apart and clean it, things should be pretty obvious.
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