Question about 1998 Mercedes-Benz C-Class
It is unlikely to be the wiper (eccentric) hub mechanism and is more likely to do with either a loose connection to wiper motor or due to dirty motor commutator or worn brushes. Just one other area is the wiper switch, is the wiper performance affected by holding on and slightly twisting the wiper selector stalk? - indication of dirt in the contacts of the switch itself. Removing the wiper motor is not such a bad job and mainly involves removing the guttering from along the bottom of the windscreen too access the four retaining bolts holding the motor frame. Once the motor is out retire to the kitchen table and give it clean up and inspect the brushes. Sometimes the brush length is fine but the guides have become so clogged with dirt and carbon that the brushes can no longer slide up and down to make good contact with the commutator. The brushes tell you a lot, if the ends making contact with commutator are shiny and smooth then they are working well. If the ends are matt black then this is indicative of arcing due to bad contact. To fix the guides remove the brushes and clean the guides internally with cotton buds moistened with a little WD40. There is no harm in soaking the whole motor in soapy water as long as it is well rinsed and allowed to dry. Apply a little light oil to the motor bearings. When reinstalling also make sure that the motor wiring connection terminals are also clean and bright (free of corrosion).
Posted on Jan 03, 2011
Check the connections at the wiper motor (below cowl) leaves and trash collect there and moisture build up/corrodes contacts on wiper motor.
Posted on Jan 03, 2011
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Posted on Jan 02, 2017
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