Mercury Racing 500R Operation And Maintenance Manual page 28

Oil Temperature
Nominal temperature at WOT
Guardian power limit (hot) (refer
to IMPORTANT remark following
this table)
Guardian power limit (cold) (refer
to IMPORTANT remark following
this table)
IMPORTANT: Oil temperatures below 55 °C (131 °F) will cause Engine
Guardian to limit the available power. Sufficient power will be available to bring
the boat on plane and run at a low cruise speed. Oil temperatures below 50 °C
(122 °F) will not sound the warning horn.
Oil temperatures above 155 °C (311 °F) will cause Engine Guardian to limit
engine power, and the warning horn will sound.
In certain special scenarios, the 500R outboard may enter Guardian mode
without alerting the operator with a horn or visual display warning. This is part
of the intended control system behavior and does not mean that service is
required.
Examples of this are:
• When the operator is trying to demand full power before the oil
temperature has reached a safe value.
• Under certain conditions when the supercharger outlet air temperature
(intake air temp) is temporarily high.
• This can happen if the operator commands 100% power immediately
upon a hot restart before allowing the engine time to fully circulate water
through the system.
• It can also be power reduced due to supercharger outlet air temperature if
the engine height is marginally high or aerated water is being introduced
on high‑speed applications.
In these cases, no warnings are sent to the operator and no faults are stored in
Freeze Frame as there is not an engine problem. The power reduction serves
to protect the engine while deterring the driver from operating the engine in
this manner and preventing nuisance faults that do not require engine service
from being stored in the PCM. In all cases, power reduction of this type can be
remedied through altering operator behavior, or a change in boat setup/engine
height.
500R SPECIFICATIONS
Attribute
Horsepower
Kilowatts
GENERAL INFORMATION
110–145 °C (230–293 °F)
155 °C (311 °F)
Less than 50 °C (122 °F)
18
500R
500
372
eng