This can be caused by overheating or reduction of air flow to the engine. Engines need substantial amounts of air to operate correctly and starvation…

This is often due to there simply being no connection between engine and propeller for one of a variety of reasons: 1. The propeller has…

This is caused by the engine being overloaded – being asked to produce more power than it is capable of – because: 1. The propeller…

The piston and connecting rod are usually the first major components to become damaged if the engine overheats. Worn cylinders and broken rings can cause…

The starter motor tries to turn the engine without success 1. The most likely cause is reduced battery voltage, so check voltage as described above.…

1. Check that there is fuel in the tank and the isolator valve is open. 2.Check that the engine stop valve is open. Cable-operated valves…

1. Check that the battery connections are tight, clean and greased. The starter motor needs a high current, so it is essential that there is…

Most engines need warming up. Running them for 10 minutes or so will also charge the batteries. Then you can start your routine checks: 1.…

The optimum propeller is the one that will drive the yacht at its designed maximum hull speed. An approximate formula for this is 1.3 times…

A diesel engine with the correct propeller will burn around 0.05 gallons of fuel per hour per horsepower. But consumption is not linear: as this…