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#1
09-29-2023, 12:55 PM
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Alternator belt adjustment W126 era
I see the sprocket on that one bolt, but what is the trick to correct tightening?
Is there a spec to deflection on the upper belt between pulleys? I just did all the belts, and that one squeals just a bit on start up now that it wore in. 30 miles. I expected to readjust after a wear in And you guys are going to set me right on how to 
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#3
09-29-2023, 04:32 PM
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If I remember right, there is a MB tool that actually calculates the deflection when you press on the belt. I think I always just press down with my thumb with fairly good force and looked for something like a half inch deflection.
That could be all wrong but is what I remember. If I can remember I will try to pull up the manual tonight and take a look. Sorry, that is not very scientific.
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#4
09-29-2023, 05:01 PM
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Thanks. I am heading out to tighten it up a tad. I will note what sort of deflection I had before and after. My guess is all will be well ( at least eventually) after this event. I couldn't figure out how to make that sprocket help me.
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#5
09-29-2023, 10:04 PM
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Turns out I did know and operated it correctly. the sprocket adjust is nice engineering. Seems I didn't tighten things down enough. The belt was loose. I did it again and expect it to remain adjusted.
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#6
09-30-2023, 03:43 PM
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Not sure your engine, but I go by pressing the belt down half an inch.
__________________
1979 Black on Black, 300CD (sold), 1990 Black 300SE, Silver 1989 Volvo 780, 1988 300CE (vanished by the hands of a girlfriend), 1992 300CE (Rescue).
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#7
09-30-2023, 06:11 PM
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Quote:
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Linear Mode
