See the other recent thread on this topic. There's a bolt that attaches the alternator to the adjusting bracket which can be removed or the whole top adjusting bracket can be removed. It's easy to bend that bolt and it makes it impossible to move the alternator until it is removed and straightened.

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13