We have in our posession 3 drawings of a Frichs diesel engine type G 1556 CV or 61556 CV:

Any chance that a scan of the drawings could be provided?
Especially the text box usually found in the right hand corner.

Apart from that, the type designations does not make much sense.
Frichs used either 3 og 4 digit designations for the engines (+ a few "outsiders").
When 4 digits are around, the 1. digit is the number of cylinders and the 3 last is the bore in mm.
Frichs build very few V-engines - most were in-line.