Anything that gives the incompressable fluid an exit will work, such as a glow plug or injector. I have not had to deal with this personally, but the cost of damage from hydro lock is high! Therefore, I would recommend that you physically check the cylinder for liquid presence and remove any that you can, using a small tube as a siphon. I would also crank the engine by hand through two revolutions (one complete combustion cycle) before using the starter. Good luck

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Deezel
87 300TDT
150,000 miles