Should be in the FSM. Just lay under the oil pan and look up. Identify the connecting rod. The one furthest toward the front of the car is the #1. It connects to the crankshaft with a bearing that is in two halves bolted together. You can see the bolts holding the rod cap half on to the half that is a part of the rod.

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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