Penske recommendations for re-starting a Detroit Diesel 2 stroke engine that has been in extended storage would be as follows –

• Ensure oil level is at correct level and cooling package is topped up with coolant.
• Remove the rocker covers and ensure the fuel rack is free (no sized injectors) and the rack can be put in the no fuel position ie able to shut down. Verify if the rack is spring loaded or the two screw type, if spring loaded and an injector seizes then the other injectors are still able to come out of fuel and shut the engine down, if it’s the two screw type and an injector seizes then the engine could “run away” as all injector will be unable to come out of fuel resulting in possible engine damage.
• Ensure the air shut off flaps are functional. If no shut off flaps are installed then you will need to remove the air intake and have a suitable board or similar that can be placed over the air intake to suffocate the engine if it begins to run away (uncontrolled running)
• Place a barring over tool on the engine.
• Ideally hooking up an electric lube oil priming pump (if not already installed) to push oil through the system before rotating the engine. Prime the engine until at least 4 psi oil pressure is seen.
• With the electric oil priming pump running bar the engine over to allow oil to feed other bearings that have had oil supply gallery blocked. Good idea to at least turn the engine over 360° to ensure all journals, bearings, etc have had fresh oil supply.
• Prime the fuel system to remove any air from the fuel system.
• Remove the baring over tool.
• Wind the engine over using the starter with the fuel rack held in the no fuel position, this will allow oil to coat the liners and ensure everything moves freely before adding load etc.
• Install the engine rocker covers and start the engine.
• Run at little to no load until the engine reaches operating temperature.
• Operate the engine as per design.

Two screw type fuel rack 

Spring loaded fuel rack

Emergency shut off flap