BRP E 250 L HO AG B, Руководство по обслуживанию

Страница: 218 / 460

Cooling System
Engine Temperature Check
218
At low speed , the pressure valve is closed and
the thermostats regulate water to flow to maintain
a temperature of approximately 143°F (62°C).
Water from the thermostat flows out of the cylinder
heads through a hose, to the exhaust adapter,
exhaust housing and then out of the outboard.
At higher speeds , water pressure opens the
pressure valve at approximately 2500 to 3000
RPM. Water bypasses the thermostats and then
flows through the pressure valve. Water from the
pressure valve flows through internal passages of
the exhaust adapter to the exhaust housing and
then exits through the gearcase water outlets.
This pressure controlled water outlet circuit pro-
vides a high flow rate of discharge water during
high speed operation.
EMM and Vapor Separator
Cooling
Cooling water is routed from the top of the cylinder
block, through a water filter to the inlet fitting of the
EMM water cavity. Cooling of the EMM helps to
stabilize the temperatures of internal components.
IMPORTANT:
Improper EMM cooling will acti-
vate fault codes 25 and 29 and the Engine Monitor
warning system. Refer to the
EMM Fault Code
Chart at the back of this manual for specific fault
code information.
Cooling water from the EMM is routed to the water
inlet fitting of the vapor separator water cavity.
Cooling the vapor separator fuel chamber mini-
mizes fuel vaporization.
Cooling water from the vapor separator is routed
to the overboard indicator.
Engine
Temperature Check
IMPORTANT:
The engine temperatures listed in
this section are based on an intake water tempera-
ture of 70° ± 10°F (21° ± 3°C).
Install correct test propeller and place outboard in
a test tank or in the water. Start outboard and run
at 3000 RPM in FORWARD gear for at least five
minutes. Remember, running outboards at high
speeds in test tanks may disrupt water flow to
gearcase water intakes. Make sure the outboard
has adequate water flow.
Reduce speed to IDLE for five minutes. Check
IDLE operating temperature.
Increase speed to 5000 RPM and check tempera-
ture.
Check temperature on both sides of powerhead.
If engine temperature is not within range, trouble-
shoot cooling system.

CAUTION
When servicing the propeller, always shift the
outboard to NEUTRAL position, turn the key
switch OFF and remove the key, so the out-
board cannot be started accidentally.