Read this thread. In one of the posts is the text of a safety recall to replace the pulleys on 78 and 79 engines. I have no idea if safety recalls this old are still in effect. But if you run into problems fixing the problem, it might be worth a call to MB to see if the recall work was ever done.
How do I attach pulley assembly- Pictures.
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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
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