Mercury 250 Specifications download pdf (Page 47)

FEATURES AND CONTROLS

Warning Horn

Function Sound Description

Cooling System

Problem

Continuous 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.

Oil Level is

Critically Low

Continuous 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.

Oil Pump

Failure

Continuous 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.

Engine

Overspeed

Continuous The warning horn is activated any time

engine speed exceeds the maximum

allowable RPM. The system will limit the

engine speed to within the allowable range.

Engine overspeed indicates a condition that

should be corrected. Overspeed could be

caused by incorrect propeller pitch, engine

height, trim angle, etc.

Sensor out of

Range

Continuous Engine Guardian System is activated.

Power will be limited.

Intermittent

Beep

ENGINE GUARDIAN SYSTEM

The Engine Guardian System monitors the critical sensors on the

engine for any early indications of problems. The system will

respond to a problem by emitting a continuous beep and/or

reducing engine power in order to provide engine protection.

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Mercury 250 Specifications Page 47

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