Yamaha E70 Owners Manual

Maintenance
75
of cooling the engine, which can
cause serious overheating. Be sure
the connector is tightened securely
on the fitting after flushing the en-
gine.
 [ECM00541] 
TIP:
●When flushing the engine with the boat in
the water, tilting up the outboard motor un-
til it is completely out of the water will
achieve better results.
●For cooling system flushing instructions,
see page 71.
EMU28451
Cleaning the outboard motor
After use, wash the exterior of the outboard
motor with fresh water. Flush the...

Maintenance
76
genuine Yamaha parts or parts of equivalent
design and quality. Any part of inferior quality
may malfunction, and the resulting loss of
control could endanger the operator and
passengers. Yamaha genuine parts and ac-
cessories are available from your Yamaha
dealer.
EMU35521
Maintenance interval guidelines
The service intervals provided in the Mainte-
nance Chart were developed based upon
“typical” use that includes operating at varied
speeds, with sufficient time for engine warm
up and...

Maintenance
77
EMU34446
Maintenance chart 1
TIP:
●Refer to the sections in this chapter for explanations of each owner-specific action.
●The maintenance cycle on these charts assume usage of 100 hours per year and regular
flushing of the cooling water passages. Maintenance frequency should be adjusted when
operating the engine under adverse conditions such as extended trolling.
●Disassembly or repairs may be necessary depending on the outcome of maintenance
checks.
●Expendable or consumable parts and...

Maintenance
78
Fuel filter (can be dis-
assembled)Inspection or replace-
ment as necessary
Fuel line (High pres-
sure)Inspection
Fuel line (High pres-
sure)Inspection or replace-
ment as necessary
Fuel line (Low pres-
sure)Inspection
Fuel line (Low pres-
sure)Inspection or replace-
ment as necessary
Fuel pumpInspection or replace-
ment as necessary
Fuel/engine oil leakage Inspection
Gear oil Replacement
Greasing points Greasing
Impeller/water pump 
housingInspection or replace-
ment as necessary...

Maintenance
79
EMU34451
Maintenance chart 2
Cooling water inlet Inspection
Main switch/stop switchInspection or replace-
ment as necessary
Wire harness connec-
tions/wire coupler con-
nectionsInspection or replace-
ment as necessary
(Yamaha) Meter/gauge Inspection
Fuel tank (Yamaha por-
table tank)Inspection and clean-
ing as necessary
Item ActionsEvery
1000 hours
Exhaust guide/exhaust 
manifoldInspection or replace-
ment as necessary
Timing belt ReplacementItem ActionsInitial Every
20 hours 
(3...

Maintenance
80
EMU28933
Greasing
Yamaha marine grease (Water resistant grease)
F50, F60, T50, T60
ZMU05087
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Maintenance
81
F70A
ZMU07089
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Maintenance
82
F70HA
EMU28957
Cleaning and adjusting spark plug
The spark plug is an important engine com-
ponent and is easy to inspect. The condition
of the spark plug can indicate something
about the condition of the engine. For exam-
ple, if the center electrode porcelain is very
white, this could indicate an intake air leak or
carburetion problem in that cylinder. Do not
attempt to diagnose any problems yourself.
Instead, take the outboard motor to a
Yamaha dealer. You should periodically re-
move...

Maintenance
83
measure the electrode gap with a wire
thickness gauge; replace it if out of spec-
ification.
4. When fitting the plug, wipe off any dirt
from the threads, and then screw it in to
the correct torque.
TIP:
If a torque-wrench is not available when you
are fitting a spark plug, a good estimate of
the correct torque is 1/4 to 1/2 a turn past fin-
ger-tight. Have the spark plug adjusted to the
correct torque as soon as possible with a
torque-wrench.
EMU29044
Inspecting idle speed
WA R N I N G...

Maintenance
84
The engine oil should be extracted with an oil
changer.
1. Put the outboard motor in an upright po-
sition (not tilted). NOTICE: If the out-
board motor is not level, the oil level
indicated on the oil dipstick may not
be accurate.
 [ECM01861] 
2. Start the engine. Warm it up and keep
the idle speed for 5-10 minutes.
3. Stop the engine and leave it for 5-10
minutes.
4. Remove the top cowling.
5. Remove the oil filler cap. Pull out the dip-
stick and use the oil changer to extract
the oil...