Your crank is broken into two parts.
By your description, I would say around the second cylinder crank pin.
If you take the lower oil pan off, you may be able to see it.
You also can move the front of the crank in and out and see how much the flywheel moves.

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76 240 D. Bought in 1998 for $25.
85 300D. Got it for free with a bad engine. ( Sold )
60 Unimog 404. What was left of it, was given to me. Now powerd by 617A.
88 560 SEL. Bought without engine and trans. Now powerd by 617A.
67 250 SE. Cuope. For resto or sale.
64 220SE. For resto.