The effects hydrostatic locking can have on your powerplant depend on the state of the engine at the time the water enters the combustion chamber. If an unit hydrolocks when idling, it will normally stop and will not allow you top bring it back to life using just the starter motor. This is happiest case, where you might not experience any damage at all.
Unfortunately, if an engine hydrolocks when being revved, the consequences can be dire. Depending on the height level of your intake and the depth of the water, as well as on the various on-site parameters, the amount of liquid that enters the engine can reach one or more cylinders.
You can experience a case where a single piston hydrolocks, while the others provide enough power to keep the engine running for a while. However, when hydrostatic locking occurs at speed, the unit will usually come to an abrupt stop.
Generally, when an engine hydrolocks at speed, the force of the camshaft pushing bends the piston rods, which are folded under the piston above them. While the crankcase or the heads can be ruined in the process and the crankshaft bearings destroyed, the shock can even cause cracks in the engine block.
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Can water enter in the engine which might cause hydrostatic lock??