Ours is a smaller engine (3 cyl Yanmar) without glow-plugs, but the manual indicates that the throttle should be advance to about 3/4 full throttle when starting.
I would review the starting procedures as described in your owners manual, to see if you are following them exactly. Big diesels can be hard to turn over and glow plugs really help with that.
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Pacific Seacraft Crealock 31 #62
NEVER CALLS CRUISINGDAD BACK....CAN"T TAKE THE ACCENT