Procedure; Lubrication; Cleaning And Anticorrosion Measures; Flushing Power Unit - Yamaha F350 Owner's Manual

Maintenance
oline purging from the fuel tank vent due to
expansion with temperature changes.
Do not cap the fuel tank vent. Excessive
pressure could damage the boat and motor's
fuel systems.
A partially filled fuel tank, less than 7/8 full
but not completely empty, is not recommend-
ed. Air space above the gasoline allows air
movement which can bring in water through
condensation as the air temperature chang-
es.
Condensation inside the fuel tank can cause
corrosion problems and phase separation of
gasoline containing ethanol.
Consult your Yamaha dealer concerning pre-
ventative measures that may work best for
the gasoline and environmental conditions in
your area.
EMU28305

Procedure

EMU41141
Cleaning the outboard motor
When cleaning the outboard motor, the top
cowling must be installed.
1. Wash the exterior of the outboard motor
using fresh water. NOTICE: Do not
spray water into the air intake.
1
1. Air intake
2. Drain the cooling water completely out of
the outboard motor. Clean the body thor-
oughly.
102
EMU28402

Lubrication

1. Install the spark plug(s) and torque to
proper specification. For information on
spark plug installation, see page 108.
2. Change the gear oil. For instructions,
see page 114. Inspect the oil for the
presence of water that indicates a leaky
seal. Seal replacement should be per-
formed by an authorized Yamaha dealer
prior to use.
3. Grease all grease fittings. For further de-
tails, see page 108.
TIP:
For long-term storage, fogging the engine
with oil is recommended. Contact your
Yamaha dealer for information about fogging
oil and procedures for your engine.
EMU41152
Cleaning and anticorrosion
measures
1. Wash the exterior of the outboard motor
using fresh water, and then dry the out-
board motor completely. For instructions
on cleaning the outboard motor, see
page 102. NOTICE: Do not spray wa-
[ECM01840] ter into the air intake.
2. Spray the outboard motor powerhead
with "Yamaha Silicone Protectant."
3. Wax the cowling with a non-abrasive
wax such as "Yamaha Silicone Wax."
EMU28445

Flushing power unit

Perform this procedure right after operation
for the most thorough flushing.
ECM01530
ZMU07209 NOTICE
Do not perform this procedure while the
engine is running. The water pump may
be damaged and severe damage from
overheating can result.
[ECM01840]