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I just had a Cat 3516 with an intermittent no start. We noticed a hard spot while cranking. Identified cylinder 16 as being at TDC during hard spot. Pulled the injector and found a rolled o-ring. Cat wanted to replace all injectors at $1500 a pieced plus labor.
Water shooting out? Engine is dead. You don't get a lot of time from when a cylinder fills with water before you must have the engine running again to prevent corrosion from causing irreparable damage.
Pull the heads ASAP for the best chance of saving the engine if you can't start it.
You can roll the engine any time. No need to remove glow plugs. You can lever it around with a screwdriver in the flywheel teeth or with a wrench on the crankshaft front bolt/pulley lugs depending on engine.