Mercury 135 Optimax Operation And Maintenance Manual page 29

The warning horn will emit either a continuous beep or intermittent short beeps. This will alert the operator and
help identify the following listed situations. For visual display of the specific engine functions and for additional
engine data, refer to SmartCraft Product information, following.
Function
Start Up
Low Oil Reserve
Water in Fuel
Cooling System Problem Continuous
Oil Level is Critically Low Continuous
Oil Pump Failure
FEATURES AND CONTROLS
Warning Horn
Sound
One Beep
Four Beeps every 2 Minutes Oil lever is low in the engine mounted
Four Beeps every 2 Minutes Water in the water separating fuel filter
Continuous
Normal System Test
oil reservoir. Refill the engine mounted
oil reservoir along with the remote oil
tank. Refer to Fuel & Oil.
reaches the full level. Water can be
removed from the filter. Refer to
Maintenance - Fuel System for filter
removal.
Engine Guardian System is activated.
Power limit will vary with level of
overheat. Shift outboard into neutral
and check for a steady stream of water
coming out of the water pump indicator
hole. If no water is coming out of the
water pump indicator hole or flow is
intermittent, stop engine and check
water intake holes for obstruction. The
Guardian System must be RESET
before engine will operate at higher
speeds. Moving throttle lever back to
idle resets the system.
Engine Guardian System is activated.
Power will be limited. The oil level is
critically low in the engine mounted oil
reservoir. Refill the engine mounted oil
reservoir along with the remote oil
tank.
Engine Guardian System is activated.
Power will be limited. The warning
horn is activated if the oil pump should
ever stop functioning electrically. No
lubricating oil is being supplied to the
engine.
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Description