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Hi Scott, my name is Jason.
What is the model number on this engine?
How hot is it getting, did you take the engines temperatures manually with an IR temp gun?
The only way to tell if the block is cracked is by taking it apart and looking at it.
You could just have a faulty temp sensor, activating prematurely. In the shop what we do is run the boat with the engine cover off. Duplicate the alarm, shut the engine off and take it's temperature with an infra red temp gun. The engine should run around 160F. If it is, then the temp sensor is faulty, activating before it should. If he engine is hot, then we would replace the impeller and thermostats and retest. These engines must be run with a working thermostat, they have open cooling systems so they can actually overheat with no thermostat in them.
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