We'll both be doing it this weekend. I just got the part in the mail. I'm guessing half an hour on a NA 617. Longer on the turbo since some (all?) have the vacuum switch for the tranmission right on top of the shut off valve. I think it needs to be removed to get access to the shut off. It it isn't removed, serious contortions will be necessary.

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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