Procedure - Yamaha F20B Owner's Manual

right), put it on a cushion after draining
the engine oil.
Do not place the outboard motor on its
G
side before the cooling water has
drained from it completely, otherwise
water may enter the cylinder through
the exhaust port and cause engine trou-
ble.
Store the outboard motor in a dry, well-
G
ventilated place, not in direct sunlight.
EMU28304

Procedure

EMU32024
Flushing in a test tank
ECM00300
NOTICE
Do not run the engine without supplying
it with cooling water. Either the engine
water pump will be damaged or the en-
gine will be damaged from overheating.
Before starting the engine, be sure to
supply water to the cooling water passag-
es.
1. Dismount the outboard motor from the
boat. For further details, see page 57.
2. Wash the outboard motor body using
fresh water. NOTICE: Do not spray wa-
ter into the air intake.
ther information, see page 61.
3. Disconnect the fuel line from the out-
board motor.
4. Remove the engine top cowling and si-
lencer cover/cap, if equipped. Remove
the propeller. For further details, see
page 71.
5. Position the outboard motor on a water
tank. For further details, see page 30.
6. Fill the tank with fresh water until the
anti-cavitation plate is immersed in wa-
ter. NOTICE: If the fresh water level is
below the level of the anti-cavitation
For fur-
[ECM01840]
plate, or if the water supply is insuffi-
cient, engine seizure may occur.
[ECM00291]
1. Water surface
2. Lowest water level
7. Cooling system flushing is essential to
prevent the cooling system from clog-
ging up with salt, sand, or dirt. In addi-
tion, fogging/lubricating of the engine is
mandatory to prevent excessive engine
damage due to rust. Perform the flush-
ing and fogging at the same time.
WARNING! Do not touch or remove
electrical parts when starting or dur-
ing operation. Keep hands, hair, and
clothes away from the flywheel and
other rotating parts while the engine
is running.
[EWM00091]
8. Run the engine at a fast idle for a few
minutes in neutral position.
9. Just prior to turning off the engine, quick-
ly spray "Fogging Oil" alternately into
each carburetor or the fogging hole of
the silencer cover, if equipped. When
properly done, the engine will smoke ex-
cessively and almost stall.
10. Remove the outboard motor from the
test tank.
11. Install the silencer cover/cap of fogging
hole (if equipped) and top cowling.
Maintenance
1
2
ZMU02051
59