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3.5 Engine Instrumentation
The following is presented to familiarize you with the instruments, which may be on your boat.
Every boat is not equipped with full instrumentation.
All factory installed Yamaha engines include Yamaha’s digital multifunction tachometer
and speedometer. Refer to your engine operators’ manual for use details.
Tachometer
The tachometer displays the number of revolutions per minute (RPM) the engine is turning. There
is a designed operation RPM range for the engine. Become familiar with the operating range of
your engine and its operating characteristics. The tachometers designed to aid the boater to assure
the engine performs within that designed range. The tachometer can be used to better understand
the performance of your engine and your EdgeWater 268CC. By monitoring your tachometer
as
you
operate your EdgeWater, you will find RPM ranges that work better in certain sea and load
conditions. Be alert the tachometer operation may provide an early indication of difficulty, before it
becomes irreversible.
Speedometer
The speedometer indicates the boat speed in miles per hour. Some types work using a spinning
wheel to determine the boat speed. Their accuracy can vary from the actual over the bottom
speed due to many factors. Other boat speedometers calculate the speed by amount of pressure
the moving water forces into a “pitot” tube. These gauges should only be used as indicators of
approximate speed and not used as absolute speed indicators. NOTE: All Yamaha
speedometers utilize a pitot tube. In the event that erroneous speed-readings appear, it is likely
caused by debris clogging the pitot tube. Consult with your dealer on methods to clean the tube
and restore normal operation.
Temperature Gauge
This is designed to monitor the operating temperature of your engine’s cooling system. A sudden
rise from the normal should be investigated to determine if there is an obstruction in the cooling
system.
Water Pressure Gauge
This gauge measures pressure in the engine cooling system. If the pressure changes from the
norm it could indicate a complete or partial blockage in the system or a water pump problem. If
this does not return to normal, your dealer should check it to make sure the cooling system is
operating properly. NOTE: Factory rigged boats are not equipped with water pressure gauges.
Fuel Gauge
This gauge indicates the amount of fuel in the fuel tank. It is always prudent to follow the “rule of
thirds”, one-third of the tank to get the destination, one-third to return, and one-third in reserve.
NOTE: It is important to “calibrate” your fuel gauge during your first initial boat trip. Record the
fuel reading prior to fill up and how may gallons to top off the tank at each fill-up. Make sure the
boat is floating the same position. By subtracting the amount to top off from total fuel capacity you
can calculate gallons remaining in the tank for 3/4, 1/2, and 1/4 gauge readings.
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