189
COOLING SYSTEM
ENGINE TEMPERATURE CHECK
9
adapter. The water reduces inner exhaust temper-
atures and cools the propeller hub.
On 3.4 L mode ls, propeller hu b coo ling water
flows t hrough an internal passage of th e in ner
exhaust housing.
EMM and Vapor Separator
Cooling
Cooling water is routed from the top of the cylinder
block to the inlet fitting o f the EMM water cavity .
Cooling of the EMM helps to stabilize the temper-
atures of internal components.
IMPORTANT: Improper EMM cooling will acti-
vate se rvice co des 25 and 29 an d the Engine
Monitor warning system. Refer to the EMM Ser-
vice Code Chart at the back of th is manua l for
specific service code information.
Cooling water from the EMM is routed to the water
inlet fitting o f th e vapor sep arator wate r cavity .
Cooling the vapor se parator fuel chamber min i-
mizes fuel vaporization.
Cooling water from the vapor separator is rou ted
to the adapter/exhaust housing.
ENGINE TEMPERATURE
CHECK
IMPORTANT: The e ngine te mperatures liste d
below are based o n an intake water temperature
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 , r unning ou tboards at hig h
speeds in test t anks may disrupt wate r flo w to
gearcase wa ter int akes. Ma ke su re the outboa rd
has adequate water flow.
Reduce sp eed to I DLE f or 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.
If e ngine temperature test s within range , but th e
engine monitor display indicates a “W ATER
TEMP” warning, refer to WATER TEMP/ HOT Cir-
cuit Test on p. 107.
3.3 Liter Models
1. External water supply hoses
2. Exhaust (plenum)
3. Inner exhaust cooling hose
000698r
A CAUTION
When servicing the propeller, always shift
the outb oard to NEUTRAL, turn the key
switch OFF, and twi st and remove all
spark plug le ads so the en gine cannot be
started accidentally.
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