Anybody have experience with really old Diesels?

My friend's parents want me to get their old early-'50's Mercedes-Benz running and I want to know where to start. It has the 1.7L 4-cyl. Diesel (rated at a whopping 40 HP!) that I believe hasn't ran for at least a year. I was thinking of cleaning the injectors and changing the vital fluids, as I would assume it has mechanical injection and the electrical system is operational (owner cranked it the other day but it didn't fire). Is there anything else I should take into consideration? BTW my friend's dad has a repro factory service manual (in English of course) for me to use.
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