Do a search on here for harmonic balancer repair. Some members have had excellent results with drilling new holes for the pins when the old holes got damaged. Other people have put on new balancers using the old holes. Pulling the crankshaft is a huge job and best avoided if possible.

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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