Page 348 - REPOWER REFERENCE GUIDE (2020)

Instrumentation and Controls

• Place the large decal on the dash within easy view of the operator.

ALARM INDICATES LOW Typical decals
OIL OR OVERHEATING a - Small decal (transparent)
a b - Large decal

APPLY THE PROPER DECAL TO THE DASHBOARD
OR OTHER APPROPRIATE LOCATION:

b

AUDIO WARNING HORN WILL SOUND WHEN:
1. ENGINE OIL PRESSURE IS TOO LOW
2. ENGINE TEMP. IS TOO HIGH, OR
3. DRIVE OIL LEVEL IS TOO LOW
TO TEST AUDIO WARNING HORN:
TURN KEY TO "ON" POSITION (ENGINE OFF)
7799
Engine Guardian
IMPORTANT: The operator should be made aware that boat speed could be reduced to idle and may not respond to throttle
should Engine Guardian be called on to protect the engine. This is covered in the Operation and Maintenance manual.
Mercury MerCruiser MPI models are equipped with an Engine Guardian to provide additional protection against engine
damage. The system is designed to help reduce the potential for engine damage by reducing engine power when a potential
problem is sensed. Engine Guardian monitors:
• Oil pressure
• Coolant temperature
• Seawater pressure
• Exhaust manifold temperature (496 MAG MPI models)
• Engine overspeed
For example, if the seawater pump inlet becomes partially blocked, Engine Guardian will reduce the available power level of the
engine to help prevent damage from decreased water flow to the engine. If the debris passes through and full water flow is
restored, engine power levels are restored to normal. In other words, Engine Guardian is a looped feedback or smart system.
Likewise, the system will reduce RPM if insufficient oil pressure or excessive coolant temperature is experienced. Digital
electronics allow the system to monitor the oil pressure versus engine RPM to more quickly alert the operator of an abnormal
condition.
Lanyard Stop Switch Information

! WARNING
Avoid serious injury or death from deceleration forces resulting from accidental or unintended stop switch activation. The boat
operator should never leave the operator's station without first disconnecting the stop switch lanyard from the operator.

RUN

13420

The purpose of a lanyard stop switch is to turn off the engine when the operator moves outside the operator's position (as in
accidental ejection from the operator's position).
Accidental ejections, such as falling overboard, are more likely to occur in:
• low sided sport boats

Page 9D-4 © 2019 Mercury Marine 90-8M0149179 eng NOVEMBER 2018