Quote:
Originally Posted by Maximan1
If he just "synchronize the linkage" as you said, the wiper would keep it's current sweep, but park where he sets it. That would cause the wiper to be "offset" from the correct sweep, and it would jam down into the hood, and only come up part way on the windscreen.
If he just moved the linkage, 240ddd would essentially be moving the 11 o'clock park position to the 9 o'clock position.
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You've clearly never worked on a Mercedes monowiper setup.
Take a careful look at this animation, and pay attention the motor and bellcrank in the first few frames. The motor simply spins, its motion isn't complex. The bellcrank is what causes the mechanism to oscillate. The maximum "left-right" extension is limited by the configuration of the levers, and the maximum "up-down" by the rotation of the transmission and its internal crank. The arm can never move below the level of the windshield. If the nut allows the crank to slip, all that will happen is that it won't stop in the correct position. By repositioning the crank and tightening the nut, you can make the wiper park wherever you like.
https://www.youtube.com/watch?v=HGO8B86PZDg
This happens...a lot...in freezing weather. The wiper freezes to the windshield, and the torque of the wiper motor causes the crank to slip under the nut. When the mechanism defrosts, the wipers won't park in the correct position.