Just looked at the picture posted above--it doesn't look right. I think that is the bottom chain cover. Here is the picture of the top. Chain guide pin access hole is number 44.
J. M. van Swaay
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1994 E320 Wagon, 230,000 miles
1995 E320 Sedan, 106,000 miles
1994 E500 Sedan, 79,000 miles
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