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don't start the engine after impeller change

Forum - Bareboat Chartering - don't start the engine after impeller change
Module Content - Sea Talks3
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Student
Jeffrey Milum
Mill Valley, CA, USA
Bareboat Charter Master Level IV
Status: Big Time Sailor
Qualified days: 127
don't start the engine after impeller change
Posted 2022, Mar 27 06:44
On the instructions for the impeller change it says: Leave engine cowling open and do not start for 1 hour as cold water instantly against a hot engine can cause the engine head to crack. I don't understand why the raw sea water is not "cold." What has changed from when the engine was running before, the impeller is still drawing up the same water, and it is going into the heat exchangert, which is designed for cold water when the engine is running, isn't it?
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