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 cooling
system with fresh water.
EMU28461
Checking painted surface of 
outboard motor
Check the outboard motor for scratches,
nicks, or flaking paint. Areas with damaged
paint are more likely to corrode. If necessary,
clean and paint the areas. A touch-up paint is
available from your Yamaha dealer.
EMU2848A
Periodic maintenance
WA R N I N G
EWM01871
These procedures require mechanical
skills, tools, and supplies. If you do nothave the proper skills, tools, or supplies
to perform a maintenance procedure,
have a Yamaha dealer or other qualified
mechanic do the work.
The procedures involve disassembling
the motor and exposing dangerous parts.
To reduce the risk of injury from moving,
hot, or electrical parts:
●Turn off the engine and keep the key(s)
and engine shut-off cord (lanyard) with
you when you perform maintenance un-
less otherwise specified.
●The power trim and tilt switches oper-
ate even when the ignition key is off.
Keep people away from the switches
whenever working around the motor.
When the motor is tilted, keep away
from the area under it or between it and
the clamp bracket. Be sure no one is in
this area before operating the power
trim and tilt mechanism.
●Allow the engine to cool before han-
dling hot parts or fluids.
●Always completely reassemble the mo-
tor before operation.
Maintenance, replacement, or repair of
the emission control devices and sys-
tems may be performed by any marine
engine repair establishment or individual.
All warranty repairs, however, including
those to the emission control system,
must be performed by an authorized
Yamaha marine dealership.
A service manual is available for purchase
through your Yamaha dealer for owners who
have the mechanical skills, tools, and other
equipment necessary to perform mainte-
nance not covered by this owner’s manual.
EMU28511
Replacement parts
If replacement parts are necessary, use only
ZMU02550
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							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 cool-down, a medium to light load,
and an average cruising speed near the
3000 to 4000 rpm range. As with any engine,
however, if your normal operating conditions
are different, you should consider service
more often than shown, especially how often
you change your engine oil and gear oil. Ex-
amples might include extended wide-open-
throttle use or long periods of trolling or
idling, carrying heavy loads, or frequent
starting and stopping or shifting. More fre-
quent maintenance will often pay off many
times over in increased engine life and great-
er owner satisfaction. Consult your Yamaha
dealer for additional maintenance recom-
mendations.
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							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 lubricants will lose their effectiveness over time and
through normal usage regardless of the warranty period.
●When operating in salt water, muddy, other turbid (cloudy), acidic water, the engine should
be flushed with clean water after each use.
The “ ” symbol indicates the check-ups which you may carry out yourself.
The “ ” symbol indicates work to be carried out by your Yamaha dealer.
Item ActionsInitial Every
20 hours 
(3 
months)100 
hours 
(1 year)300 
hours 
(3 years)500 
hours 
(5 years)
Anode(s) (external)Inspection or replace-
ment as necessary
Anode(s) (cylinder 
head, thermostat 
cover)Inspection or replace-
ment as necessary
Anodes (exhaust cover, 
cooling water passage 
cover, Rectifier Regula-
tor cover)Replacement
Battery (electrolyte 
level, terminal)Inspection
Battery (electrolyte 
level, terminal)Fill, charging or replac-
ing as necessary
Cooling water leakageInspection or replace-
ment as necessary
Cowling lock lever Inspection
Engine starting condi-
tion/noiseInspection
Engine idle 
speed/noiseInspection
Engine oil Replacement
Engine oil filter (car-
tridge)Replacement
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							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
Impeller/water pump 
housingReplacement
Power trim and tilt unit Inspection
Propeller/propeller 
nut/cotter pinInspection or replace-
ment as necessary
Shift link/shift cableInspection, adjustment 
or replacement as nec-
essary
Spark plug(s)Inspection or replace-
ment as necessary
Spark plug caps/spark 
plug wiresInspection or replace-
ment as necessary
Water from the cooling 
water pilot holeInspection
Throttle link/throttle 
cable/throttle pick-up 
timingInspection, adjustment 
or replacement as nec-
essary
ThermostatInspection or replace-
ment as necessary
Timing beltInspection or replace-
ment as necessary
Valve clearanceInspection and adjust-
ment Item ActionsInitial Every
20 hours 
(3 
months)100 
hours 
(1 year)300 
hours 
(3 years)500 
hours 
(5 years)
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							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 
months)100 
hours 
(1 year)300 
hours 
(3 years)500 
hours 
(5 years)
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							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 and inspect the spark plug because
heat and deposits will cause the spark plug
to slowly break down and erode.
1. Remove the spark plug caps from the
spark plugs.
2. Remove the spark plug. If electrode ero-
sion becomes excessive, or if carbonand other deposits are excessive, you
should replace the spark plug with an-
other of the correct type. WARNING!
When removing or installing a spark
plug, be careful not to damage the in-
sulator. A damaged insulator could
allow external sparks, which could
lead to explosion or fire.
 [EWM00561] 
3. Be sure to use the specified spark plug,
otherwise the engine may not operate
properly. Before fitting the spark plug,
ZMU07088
Standard spark plug:
F50TR DPR6EB-9
F60TR DPR6EB-9
F70A LKR7E
T50TR DPR6EB-9
T60TR DPR6EB-9
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							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
EWM00451
●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.
NOTICE
ECM00490
This procedure must be performed while
the outboard motor is in the water. A
flushing attachment or test tank can be
used.
If the boat is not equipped with a tachometer
for the outboard motor, use a diagnostic ta-
chometer for this procedure. Results may
vary depending on whether testing is con-
ducted with the flushing attachment, in a test
tank, or with the outboard motor in the water.
1. Start the engine and allow it to warm up
fully in neutral until it is running smooth-
ly.
2. Once the engine has warmed up, verify
whether the idle speed is set to specifi-
cation. For idle speed specifications, see
page 14. If you have difficulty verifying
the idle speed, or the idle speed requires
adjustment, consult a Yamaha dealer or
other qualified mechanic.
EMU37494
Changing engine oil
NOTICE
ECM01710
Change the engine oil after the first 20
hours of operation or 3 months, and ev-
ery 100 hours or at 1-year intervals there-
after. Otherwise the engine will wear
quickly.
1. Spark plug gap
2. Spark plug part number
3. Spark plug I.D. mark (NGK)
Spark plug gap:
0.8–0.9 mm (0.031–0.035 in)
Spark plug torque:
F50TR 18.0 Nm (1.84 kgf-m, 13.3 ft-lb)
F60TR 18.0 Nm (1.84 kgf-m, 13.3 ft-lb)
F70A 17.0 Nm (1.73 kgf-m, 12.5 ft-lb)
T50TR 18.0 Nm (1.84 kgf-m, 13.3 ft-lb)
T60TR 18.0 Nm (1.84 kgf-m, 13.3 ft-lb)
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							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 completely.
6. Add the correct amount of oil through the
filler hole. Put back the filler cap and the
dipstick. NOTICE: Overfilling the oil
could cause leakage or damage. If theoil level is above the upper level
mark, drain until the level meets the
specified capacity.
 [ECM01850] 
7. Leave the outboard motor for 5-10 min-
utes.
8. Remove oil dipstick and wipe it clean.
9. Insert the dipstick and remove it again.
Be sure to completely insert the dipstick
1. Oil changer
ZMU03659
1
ZMU06187
1. Oil filler cap
1. Oil filler cap
Recommended engine oil:
4-stroke outboard motor oil
Replacement engine oil quantity (at peri-
odic maintenance):
Without oil filter replacement: 
1.9 L (2.01 US qt, 1.67 Imp.qt)
With oil filter replacement: 
2.1 L (2.22 US qt, 1.85 Imp.qt)
1
ZMU05101
1
ZMU07091
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