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  #1  
Old 02-11-2021, 11:48 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,053
w124 Mono Wiper

Guys,

We had a nice icing event here in NE Texas.

After work, I work nights, it chipped the wiper blade out of the ice. Started the car and allowed it to warm up. Wiper was working fine.

I turned the wiper off, and got to the interstate, when freezing rain hit again. I turned on the wiper, and it moved and the halted in the center position.

I got it home, and was able to move the wiper arm by hand.

I checked the fuses, nothing blown.

Any ideas?

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RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 290K miles

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 188K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #2  
Old 02-12-2021, 06:18 AM
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Join Date: Aug 2019
Location: Pacific Northwest
Posts: 805
Can you hear the wiper motor running?
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1990 300SE (Daily driver)
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  #3  
Old 02-12-2021, 08:33 PM
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Join Date: Nov 2018
Location: Dallas, TX
Posts: 329
I disassembled and reassembled it twice.
Probably lack of lubrication, that's what causes all of them to fail (no vertical movement). There was literally plastic dust in mine.
Taking it off and repairing - not a lot of fun, but not difficult. You need to open the mechanism to properly inspect and lubricate it.
These motors rarely fail.
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  #4  
Old 02-13-2021, 06:12 AM
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Join Date: Feb 2003
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Ahh the good 'ol DTM look!

Had this on a lot of w124's, sometimes fixed with a diassembly amd lubing, sometimes needed a new (-ish used) wiper motor assembly.
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  #5  
Old 02-13-2021, 09:28 PM
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Join Date: Dec 2006
Posts: 3,888
If the blade moves and oscillates, then all you need to replace is the motor. It's a tedious job, but not impossible. If the blade doesn't oscillate, you'll have to disassemble to determine the problem. If the gear is broken, these are available as replacements if you need one:

https://www.odometergears.com/products/Mercedes-Benz/E+class+%28124%29++84-95+Mech./50
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  #6  
Old 02-13-2021, 11:11 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,053
The motor does not seem to try to come one. I manually moved the wiper to its park, and now I cannot move it. Also noticed a burnt plastic smell in the air vents.

I bet I need to replace the motor, or the relay. But, it smells similiar to burnt motor windings.

Will the facelift system replace the pre facelift wiper system? I found a few near by at wrecking yard, running 50 to 150.
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RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 290K miles

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 188K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #7  
Old 02-14-2021, 04:49 AM
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Join Date: Feb 2003
Posts: 194
Yup wiper mechanisms interchange throughout the entire production of the W124.
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  #8  
Old 02-14-2021, 08:33 AM
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Join Date: Aug 2019
Location: Pacific Northwest
Posts: 805
Quote:
Originally Posted by rrgrassi View Post
The motor does not seem to try to come one. I manually moved the wiper to its park, and now I cannot move it. Also noticed a burnt plastic smell in the air vents.

I bet I need to replace the motor, or the relay. But, it smells similiar to burnt motor windings.

Will the facelift system replace the pre facelift wiper system? I found a few near by at wrecking yard, running 50 to 150.
Before spending the money you can try and power the motor directly.

Wiper motor terminals:

2 - Ground
5 - Low/Normal Speed
3 - High Speed

Check out page 185 of this wiring diagram:
http://www.w124performance.com/service/w124CD1/Program/ETM/ETM.pdf
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1990 300SE (Daily driver)
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  #9  
Old 02-15-2021, 11:35 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,053
If I have to buy a replacement unit, what year car would be best? I found some in a local wrecking yard.

Thanks!
__________________
RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 290K miles

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 188K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #10  
Old 02-17-2021, 01:22 PM
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Join Date: Nov 2018
Location: Dallas, TX
Posts: 329
Quote:
Originally Posted by rrgrassi View Post
If I have to buy a replacement unit, what year car would be best? I found some in a local wrecking yard.

Thanks!
Where? I'm looking everywhere for 124 in the yards and there is nothing
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  #11  
Old 02-19-2021, 08:00 PM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,053
I used car-part.com Found yards near me. They are in the Dallas area.
__________________
RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 290K miles

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 188K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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  #12  
Old 02-24-2021, 01:17 AM
rrgrassi's Avatar
mmmmmm Diesel...
 
Join Date: Jun 2006
Location: Royse City Tx
Posts: 5,053
Found a wiper assembly, from a 93 300E. Paid $47 for it. I tested the new motor, it ran nice and quiet. Tested the old motor and it was noisy, and the mechanism was stiff and notchy.

The replacment assembly works well.

I have one problem...somehow I lost the plastic part that covers the wiper arm set screw. Anyone know where to find one?

__________________
RRGrassi


70's SPM #5608 Fairmont A-4 MOW car

06 VW Jetta TDI 290K miles

91 W124 300D Turbo replaced, Pressure W/G actuator installed. 188K

90 Dodge D250 5.9 Cummins/5 speed. 400K
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