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E320 CDI mono wiper failure

andyturner

New Member
Joined
Jun 26, 2006
Messages
7
Now that we have a period of prolonged rain after 2 or 3 dry months my windscreen wiper decided to stop working. It was on Sunday evening just in time for my Monday morning commute for which rain is forecast. I knew it wasn't one of the usual electrical glitches that would be sorted by a switch off as I could hear the motor.
I needed to sort the problem as I had to get to work the next day. I stripped off the various plastic covers and removed the motor and mechanism (in the rain). I saw the cause of the failure, the motor has a rotor arm with a ball joint linking it to the rest of the mechanism. the ball was badly corroded and had popped out of the plastic socket. The ball was so corroded that it would not pop back into the socket.
I decided to drill a hole through the ball and socket and fit a nut and bolt. I put everything back together and the wiper works fine, smooth and quieter that ever. The only problem is that it stops at the 5 to 1 position. This is because the rotor arm can be fitted to the motor shaft in any position as there is no reference point. I will sort this later.

This is only a temporary fix, I wondered if anyone knew if it is possible to just buy the rotor arm and plastic socket, or do I have to buy the complete mechanism? I suspect the latter, in which case I will do a permanent repair myself as I have heard prices running into the hundreds for a mechanism.

Andy
 
Last edited:
Now that we have a period of prolonged rain after 2 or 3 dry months my windscreen wiper decided to stop working. It was on Sunday evening just in time for my Monday morning commute for which rain is forecast. I knew it wasn't one of the usual electrical glitches that would be sorted by a switch off as I could hear the motor.
I needed to sort the problem as I had to get to work the next day. I stripped off the various plastic covers and removed the motor and mechanism (in the rain). I saw the cause of the failure, the motor has a rotor arm with a ball joint linking it to the rest of the mechanism. the ball was badly corroded and had popped out of the plastic socket. The ball was so corroded that it would not pop back into the socket.
I decided to drill a hole through the ball and socket and fit a nut and bolt. I put everything back together and the wiper works fine, smooth and quieter that ever. The only problem is that it stops at the 5 to 1 position. This is because the rotor arm can be fitted to the motor shaft in any position as there is no reference point. I will sort this later.

This is only a temporary fix, I wondered if anyone knew if it is possible to just buy the rotor arm and plastic socket, or do I have to buy the complete mechanism? I suspect the latter, in which case I will do a permanent repair myself as I have heard prices running into the hundreds for a mechanism.

Andy

A2108200141 might do the job.
 
yes, that is the correct part. £75 plus post from MB
 

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