I shouldn't have changed my wiper...

[mike18hc]

It's a '95 C220 W202.
Mike

 

[mike18hc]

Sorry I ignored your picture Dec.
That is the connector my wiper motor has.
This is the fracture.

 

[Dec]

I don’t know anything about welding aluminium, do you think you can fix that?

I would say one of the nuts on the mechanism became lose and caused the whole mechanism to become rickety and the motor just snapped the alloy, the motor is very strong and its torque is instant.


You have 4 possible solutions;

1…Weld the mechanising and hope the motor is ok, it probably is and no cost.

2… Buy another mechanism without motor, see… 2000 Mercedes C Class W202 wiper linkage | eBay

3… Same seller, buy another mechanism without motor, see… 1997 Mercedes C Class W202 wiper linkage | eBay

4… Buy this mechanism with a motor, seems all set and ready to fit, may need a good wash with WD40 and then some grease, see… Mercedes C CLASS W202 WIPER MOTOR WITH LINKAGE & ARM 2028206442 403.927 12V | eBay


Dec

 

[toolman1954]

Just an observation......The breakers seem to want an awful lot for a wiper motor and linkage for a 202 ?? I think I only paid £25 for one for my 211 not so long ago. I would have thought, plenty of 202's in the breakers yards. ??

 

[Dec]

I’d say the can get a lot more on e bay but quick cash if in person in a yard brings the price down.

Dec

 

[mike18hc]

I did the brazing and overhauled all the moving and movable parts.
It works well, parking correctly, sweeping very cleanly and quietly with no hesitations and over the right distance - for now.
I couldn't find anything loose but there was and is a slight twisting in the aluminium casting near the motor, but perhaps that's normal.
Where it had fractured there were signs of metal fatigue with internal oxidation and a small piece had broken off inside the area of the motor bolts...some time ago looking at the oxidation around it.
The repaired part sat flat on the 3 supports and circular mount so it could last a while.
Not so much a catastrophe, more a steep learning curve, and I shouldn't have blamed the blade for hitting the trim.
It could all be down to 13 year-old aluminium.

 

[Dec]

Good result, hope it turns out to be a permanent fix.

Dec

 

[mike18hc]

Duh. 23 year-old aluminium!

 

[toolman1954]

Welding old cast aluminium is never an easy task ....Respect ....

 

[mike18hc]

I was surprised to find this online. Interestingly this LHD item's fracture follows almost exactly the same path as in mine.

 

[Dec]

Another one, a nuts & bolts approach, post #53… Complete Windshield Wiper Diagnostics and Repair Instructions - MBWorld.org Forums

Dec

 

[mike18hc]

...and all fractured in almost exactly the same place.
It's good to know I'm not alone but somehow I find the consistency of the problem rather offputting.

 

[mike18hc]

Off I go again.
I bought a complete mechanism from ebay and tested and installed it today. The motor and linkage shook and squeaked and, after swapping these with good parts from my brazed casting, I found the extension mechanism clunked too! That noise had been camouflaged by the other noises.
I remember seeing somewhere online how to dismantle that mechanism. Now I need to swap it for my good one I have been completely unable to find it.
Am I right that it's possible to exchange these mechanisms?
Can anyone point me in the right direction to find the instructions, please?
Tomorrow, anyway, I'm adding some bracing plates across the brazed area. Then I can put my original combination back together and use it with a lot more confidence.

 

[Dec]

C class 180 93 wipers park mid screen
That it?

Dec

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[mike18hc]

The more I think about it and the more I look at the throw-out mechanism the more I feel I'm probably misleading myself. It looks like it's actually a part of the casting which would mean there's no clean way to swap one from my casting to this one... and also that I mis-remembered what I saw online.
I greased the ebay one before testing it but I didn't check its two shafts for wear as I'd bought a direct replacement and didn't expect many problems.
Hopefully I can add at least two strengthening plates to my mechanism even though there's very little space, and then I'll rebuild it hoping it'll still work as well as it did before I tried to improve it!

 

[Dec]

Which part are you talking about swapping over?

If you have to add brackets to reinforce the weld then the weld must be failing, you best start with an unbroken mechanism. Do you have any pictures to illustrate what it is you intend to do?

Did the tip of the wiper blade at any time hit the side trim of the windsheeld?


Dec