My Watermota has not got glow plugs, and starts instantly - if your starter system is 24 volts, then it is the same as mine, but DO NOT crank the engine for more than 15 seconds, because the starter motor is 12 volt, and will overheat... Great engineering bodges of the 20th Century!
I have a complete manual, wiring diagram and parts list if you need it - am based South Hampshire if local you are welcome to copy it