Thread: w124 Serpentine adjustment?
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Old 02-28-2017, 12:39 PM
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Mike Murrell Mike Murrell is offline
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Mine does not contain an allen bolt. Plain hex bolt - see part #56 in diagram. You loosen that first; then loosen/tighten #41. Once belt is snug tighten #56

Already mentioned, but I'll reinforce. Be prepared to replace the tensioner. They do not last long and the more you loosen/tighten, the sooner they lose all ability to hold belt tension.

A terrible design.
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Mike Murrell
1991 300-SEL - Model 126
M103 - SOHC
"Fräulein"
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