| 摘要 |
A water pump circulates cooling water to an outboard engine, and overheating does not generally occur unless the circulation is insufficient. A pressure sensor responsive to low pressures so as to actuate an alarm, except when the engine RPM are at or below a selected level, such as those corresponding to a trawling operation where an alarm would be bothersome. A temperature sensor can be provided to stop the engine or reduce its output in the event that the engine temperature exceeds a selected temperature.
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