Maintenance
72
EMU28306
Procedure
EMU43333
Flushing in a test tank
NOTICE
ECM00302
Before starting the engine, make sure to
supply water to the cooling water passag-
es. Otherwise, the engine could overheat
and be damaged.
1.
Dismount the outboard motor from the
boat. For further details, see page 69.
2.
Wash the outboard motor body using
fresh water.
NOTICE:
Do not spray wa-
ter into the air intake.
[ECM01841]
For further
information, see page 74.
3.
Fill the fuel tank with fresh fuel and add
one ounce of “Yamaha Fuel Conditioner
and Stabilizer” to each gallon of fuel.
TIP:
The use of “Yamaha Fuel Conditioner and
Stabilizer” eliminates the need to drain the
fuel system. Consult your Yamaha dealer or
other qualified mechanic if the fuel system is
to be drained instead.
4.
Disconnect the fuel hose from the fuel
joint on the outboard motor.
5.
Remove the top cowling and silencer
cover (if equipped). Remove the propel-
ler. For further details, see page 84.
6.
Position the outboard motor on a water
tank. For further details, see page 38.
7.
Fill the tank with fresh water to above the
level of the anti-cavitation plate.
NOTICE:
If the fresh water level is be-
low the level of the anti-cavitation
plate, or if the water supply is insuffi-
cient, engine seizure may occur.
[ECM00292]
8.
Cooling system flushing is essential to
prevent the cooling system from clog-
ging up with salt, sand, or dirt. In addi-
tion, fogging of the engine is mandatory
to prevent excessive engine damage due
to rust. Perform the flushing and fogging
at the same time.
WARNING! Do not
touch or remove electrical parts when
starting or during operation. Keep
hands, hair, and clothes away from
the flywheel and other rotating parts
while the engine is running.
[EWM00092]
9.
Run the engine at a fast idle for 10–15
minutes in neutral position.
10. Just prior to turning off the engine, quick-
ly spray “Yamaha Stor-Rite Engine Fog-
ging Oil” alternately into each carburetor
or the fogging hole of the silencer cover,
if equipped. When properly done, the en-
gine will smoke excessively and almost
stall.
1. Water surface
2. Lowest water level
ZMU02051
1
2
U6DR38E0.book Page 72 Tuesday, November 27, 2018 2:08 PM
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