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A diesel engine on a sailboat experienced a sudden "clack" sound and seized while attempting to start, indicating a potential hydraulic lock.0:23 The host suspects water entered the cylinders through the exhaust injection elbow or a failed head gasket, a common risk after the engine has previously overheated due to aeration in the raw water intake during heeling.0:57 To diagnose and clear the cylinders, the host removes the fuel injectors to allow any trapped fluid to escape when the engine is turned over.5:55 The process involves disconnecting the fuel supply lines and return rail, then carefully wiggling the injectors out of the cylinder head, which are often seized by corrosion.11:00 The host uses penetrating oil to loosen the injectors and emphasizes the importance of avoiding damage to the fuel pipes or snapping the mounting studs.16:08 Once the injectors are removed, the engine can be cranked to expel any water from the combustion chambers.21:22 The host also notes that electrical issues with the ignition panel on this engine model can sometimes be traced to a large connector near the engine cutoff.22:12

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