I recently set off under engine with the main sea water intake cock shut because someone working on the generator forgot to open it when the sea water pump was replaced. Luckily I realised something was wrong within a few minutes and returned on low power to the marina where I discovered the seawater intake was closed. Like Mark I was also concerned that the alarm in the companionway did not sound. I am also wondering now if the alarm is faulty on my SM2K and if there is a means of testing it. After this I replaced the sea water impellor on the engine as a precaution in case there was any damage although the engine only ran for about five minutes. The engine has been fine ever since.
