These old diesels are 100% mechanical; they don't even need a battery
after they're running.
Put a 27MM socket on the crankshaft and turn the engine by hand or a
wrench on the power steering pump's pulley and turn the engine that way.
Be sure you turn it in the correct rotation, not backwards.
Alternatively, you can remove the 80 amp link from the glow plug relay
and use the starter to bump it but now without its glow plugs operating.