If the windshield is really wet, it works OK? Will the wiper blade move all the way if you "help" it? Just wondering if there is a mechanical problem in the transmission or some dry bearings.

My '87 300D Turbo (W124, OM603) started making a ticking noise while on a rainy-day trip. Turned out one of the four bolts securing the wiper assembly had started to back out and was being struck by the linkage every time the arm rotated. Tightening the bolt fixed the problem.

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970