I would crank the Engine over with out the Glow Plugs in so that it would turn over faster and easier and I could get some Oil circulated to the parts and maybe this would be enough to spray some Oil up to the Pistons and Cylinders (if your engine has srayers).

However, rebuilt Engines can be tight and not crank nearly as fast so I am hope you will report back on your progress.

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84 300D, 82 Volvo 244Gl Diesel