Hydrolocking marine diesels isn't all that uncommon a mistake.
What happens is that the water-lift muffler will bring water in as you crank the engine. If you crank the engine for more than about 20 seconds, depending on the exact design, the amount of water that comes in the exhaust can fill the muffler and enter the engine via the exhaust valves.
The reason this happens, is if the engine isn't running, the exhaust gas pressure that keeps the water level down in the water lift muffle doesn't exist. Once water enters the engine, it will cause the engine to "hydro lock" since water isn't compressible. This can cause a lot of engine damage, but doesn't always do so. The water could then leak from the hydrolocked cylinder into the crankcase, past the piston seals.
The soft spot around the deck you should ask CruisingDad about. Send him a PM or maybe, he'll check in this thread.
BTW, you really shouldn't start multiple threads on the same subject.
Personally, I'd walk away from this boat.... there are enough others that finding one without these issues isn't a big problem.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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