If you have the AC compressor mounted high to the right of the engine, you'll have to either remove the compressor and mounting bracket or grind away part of the bracket to access one water pump bolt. I've posted on this in the past. A dremel with a grinding bit will save a lot of hassle. (I don't know in what year MB went to the low left mounting of the AC compressor but the high right is the earlier system.)

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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