Yamaha E70 Owners Manual

							Maintenance
85
into the dipstick guide, otherwise the oil
level measurement will be incorrect.
10. Recheck the oil level using the dipstick
to be sure the level falls between the up-
per and lower marks. Consult your
Yamaha dealer if the oil level is out of
specified level.
11. Start the engine and make sure that the
low oil pressure-alert indicator remains
off. Also, make sure that there are no oil
leaks. NOTICE: If the low oil pressure-
alert indicator comes on or if there
are oil leaks, stop the engine and find
the cause. Continued operation with
a problem could cause severe engine
damage. Consult your Yamaha dealer
if the problem cannot be located and
corrected.
 [ECM01622] 
12. Dispose of used oil according to local
regulations.
TIP:
●For more information on the disposal of
used oil, consult your Yamaha dealer.
●Change the oil more often when operating
the engine under adverse conditions such
as extended trolling.
EMU29114
Inspecting wiring and connectors
●Inspect that each connector is engaged
securely.
●Inspect that each ground lead is properly
secured.
EMU32112
Checking propeller
WA R N I N G
EWM01881
You could be seriously injured if the en-
gine accidentally starts when you are
near the propeller. Before inspecting, re-
moving, or installing the propeller, place
the shift control in neutral, turn the main
switch to “ ” (off) and remove the key,
and remove the clip from the engine shut-
off switch. Turn off the battery cut-off
switch if your boat has one.
Do not use your hand to hold the propeller
when loosening or tightening the propeller
1. Lower level mark
2. Oil dipstick
3. Upper level mark
132
ZMU05091
ZMU07106
ZMU07107
6C1-9-19.book  85 ページ  ２０１０年２月１７日　水曜日　午後１時３８分 
						

							Maintenance
86
nut. Put a wood block between the anti-cavi-
tation plate and the propeller to prevent the
propeller from turning.
Checkpoints
●Check each of the propeller blades for ero-
sion from cavitation or ventilation, or other
damage.
●Check the propeller shaft for damage.
●Check the splines for wear or damage.
●Check for fish line tangled around the pro-
peller shaft.
●Check the propeller shaft oil seal for dam-
age.
EMU30662
Removing propellerEMU29197
Spline models
1. Straighten the cotter pin and pull it out
using a pair of pliers.
2. Remove the propeller nut, washer, and
spacer (if equipped). WARNING! Donot use your hand to hold the propel-
ler when loosening the propeller nut.
[EWM01890] 
3. Remove the propeller, washer (if
equipped), and thrust washer.
EMU30672
Installing propellerEMU29234
Spline models
NOTICE
ECM00501
Make sure to use a new cotter pin and
bend the ends over securely. Otherwise,
the propeller could come off during oper-
ation and be lost.
1. Apply Yamaha marine grease or a corro-
sion resistant grease to the propeller
shaft.
2. Install the spacer (if equipped), thrust
washer, washer (if equipped), and pro-
peller on the propeller shaft. NOTICE:
Make sure to install the thrust washer
before installing the propeller. Other-
wise, the lower case and propeller
boss could be damaged.
 [ECM01881] 
ZMU01897
1. Cotter pin
2. Propeller nut
3. Washer
4. Spacer
5. Propeller
6. Thrust washer
6C1-9-19.book  86 ページ  ２０１０年２月１７日　水曜日　午後１時３８分 
						

							Maintenance
87
3. Install the spacer (if equipped) and the
washer. Tighten the propeller nut to the
specified torque.
4. Align the propeller nut with the propeller
shaft hole. Insert a new cotter pin in the
hole and bend the cotter pin ends.
NOTICE: Do not reuse the cotter pin.
Otherwise, the propeller can come off
during operation.
 [ECM01891] 
TIP:
If the propeller nut does not align with the
propeller shaft hole after tightening to the
specified torque, tighten the nut further to
align it with the hole.
EMU29289
Changing gear oil
WA R N I N G
EWM00800
●Be sure the outboard motor is securely
fastened to the transom or a stable
stand. You could be severely injured if
the outboard motor falls on you.
●Never get under the lower unit while it
is tilted, even when the tilt support leveror knob is locked. Severe injury could
occur if the outboard motor accidental-
ly falls.
1. Tilt the outboard motor so that the gear
oil drain screw is at the lowest point pos-
sible.
2. Place a suitable container under the
gear case.
3. Remove the gear oil drain screw and
gasket. NOTICE: If there is an exces-
sive quantity of metal particles on the
magnetic gear oil drain screw, this
can indicate lower unit problem. Con-
sult your Yamaha dealer.
 [ECM01900] 
TIP:
●If a magnetic gear oil drain screw is
equipped, remove all metal particles from
the screw before installing it.
●Always use new gaskets. Do not reuse the
removed gaskets.
4. Remove the oil level plug and gasket to
allow the oil to drain completely.
NOTICE: Check the used gear oil after
it has been drained. If the gear oil is
milky or contains water or a large
amount of metal particles, the gear
case may be damaged. Have a
Yamaha dealer check and repair the Propeller nut tightening torque:
F50TR 35.0 Nm (3.57 kgf-m, 25.8 ft-lb)
F60TR 35.0 Nm (3.57 kgf-m, 25.8 ft-lb)
F70A 34.0 Nm (3.47 kgf-m, 25.1 ft-lb)
T50TR 35.0 Nm (3.57 kgf-m, 25.8 ft-lb)
T60TR 35.0 Nm (3.57 kgf-m, 25.8 ft-lb)
ZMU020631. Gear oil drain screw
2. Oil level plug
ZMU03273
2
1
6C1-9-19.book  87 ページ  ２０１０年２月１７日　水曜日　午後１時３８分 
						

							Maintenance
88
outboard motor. [ECM00713] 
TIP:
For disposal of used oil, consult your
Yamaha dealer.
5. Put the outboard motor in a vertical posi-
tion. Using a flexible or pressurized fill-
ing device, inject the gear oil into the
gear oil drain screw hole.
6. Put a new gasket on the oil level plug.
When the oil begins to flow out of the oil
level plug hole, insert and tighten the oil
level plug.
7. Put a new gasket on the gear oil drainscrew. Insert and tighten the gear oil
drain screw.
EMU29302
Cleaning fuel tank
WA R N I N G
EWM00920
Gasoline is highly flammable, and its va-
pors are flammable and explosive.
●If you have any question about properly
doing this procedure, consult your
Yamaha dealer.
●Keep away from sparks, cigarettes,
flames, or other sources of ignition
when cleaning the fuel tank.
●Remove the fuel tank from the boat be-
fore cleaning it. Work only outdoors in
an area with good ventilation.
●Wipe up any spilled fuel immediately.
●Reassemble the fuel tank carefully. Im-
proper assembly can result in a fuel
leak, which could result in a fire or ex-
plosion hazard.
●Dispose of old gasoline according to lo-
cal regulations.
1. Empty the fuel tank into an approved
container.
2. Pour a small amount of suitable solvent
into the tank. Install the cap and shake
the tank. Drain the solvent completely.
3. Remove the screws holding the fuel joint
assembly. Pull the assembly out of the
tank. Recommended gear oil:
Hypoid gear oil SAE#90
Gear oil quantity:
F50TR 0.430 L 
(0.455 US qt, 0.378 Imp.qt)
F60TR 0.430 L 
(0.455 US qt, 0.378 Imp.qt)
F70A 0.670 L 
(0.708 US qt, 0.590 Imp.qt)
T50TR 0.670 L 
(0.708 US qt, 0.590 Imp.qt)
T60TR 0.670 L 
(0.708 US qt, 0.590 Imp.qt)
Tightening torque:
9 Nm (0.9 kgf-m, 6.6 ft-lb)
ZMU03274
Tightening torque:
9 Nm (0.9 kgf-m, 6.6 ft-lb)
6C1-9-19.book  88 ページ  ２０１０年２月１７日　水曜日　午後１時３８分 
						

							Maintenance
89
4. Clean the filter (located on the end of the
suction pipe) in a suitable cleaning sol-
vent. Allow the filter to dry.
5. Replace the gasket with a new one. Re-
install the fuel joint assembly and tighten
the screws firmly.
EMU29313
Inspecting and replacing anode(s)
Yamaha outboard motors are protected from
corrosion by sacrificial anodes. Inspect the
external anodes periodically. Remove scales
from the surfaces of the anodes. Consult a
Yamaha dealer for replacement of external
anodes.
NOTICE
ECM00720
Do not paint anodes, as this would render
them ineffective.
TIP:
Inspect ground leads attached to external
anodes on equipped models. Consult a
Yamaha dealer for inspection and replace-
ment of internal anodes attached to the pow-
er unit.
EMU29323
Checking battery (for electric start 
models)
WA R N I N G
EWM01902
Battery electrolyte is poisonous and
caustic, and batteries generate explosive
hydrogen gas. When working near the
battery:
●Wear protective eye gear and rubber
gloves.
●Do not smoke or bring any other source
of ignition near the battery.
The procedure for checking the battery var-
ies for different batteries. This procedure
ZMU02324
ZMU04721
ZMU02820
ZMU04722
6C1-9-19.book  89 ページ  ２０１０年２月１７日　水曜日　午後１時３８分 
						

							Maintenance
90
contains typical checks that apply to many
batteries, but you should always refer to the
battery manufacturer’s instructions.
NOTICE
ECM01920
A poorly maintained battery will quickly
deteriorate.
1. Check the electrolyte level.
2. Check the battery’s charge. If your boat
is equipped with the digital speedome-
ter, the voltmeter and low battery alert
functions will help you monitor the bat-
tery’s charge. If the battery needs charg-
ing, consult your Yamaha dealer.
3. Check the battery connections. They
should be clean, secure, and covered by
an insulating cover. WARNING! Bad
connections can produce shorting or
arcing and cause an explosion.
[EWM01912] EMU29343
Connecting the battery
WA R N I N G
EWM00572
Mount the battery holder securely in a
dry, well-ventilated, vibration-free loca-
tion in the boat. Install a fully charged bat-
tery in the holder.
NOTICE
ECM01124
Do not reverse the battery cables. Other-wise, the electrical parts could be dam-
aged.
Connect the RED cable to the POSITIVE (+)
terminal first. Then connect the BLACK cable
to the NEGATIVE (-) terminal.
Using a single battery
Connect both red cables to the (+) terminal.
WA R N I N G
EWM00590
Do not leave cable unconnected. If it acci-
dentally contacts the NEGATIVE (-) termi-
nal of the battery, there will be a short
circuit. Electric system damage and a fire
could result.
Using an accessory battery
Use a connecting cable between the (-) ter-
minals of the starting battery and accessory
battery. See the illustrations of the wiring
connections. This cable must be made from
wire equivalent to the starting battery cable.
WA R N I N G
EWM00600
Use of smaller wire could lead to a fire.
TIP:
Consult your Yamaha dealer about correct
wiring if a battery selector switch is desired.
1. Red cable
2. Black cable
3. Battery
ZMU01811
1
2
3
6C1-9-19.book  90 ページ  ２０１０年２月１７日　水曜日　午後１時３８分 
						

							Maintenance
91
EMU29371
Disconnecting the battery
1. Turn off the battery cut-off switch (if
equipped) and main switch. NOTICE: If
they are left on, the electrical system
can be damaged.
 [ECM01930] 
2. Disconnect the negative cable(s) from
the negative (-) terminal. NOTICE: Al-
ways disconnect all negative (-) ca-
bles first to avoid a short circuit and
damage to the electrical system.
[ECM01940] 
3. Disconnect the positive cable(s) and re-
move the battery from the boat.
4. Clean, maintain, and store the battery
according to the manufacturer’s instruc-
tions.
6C1-9-19.book  91 ページ  ２０１０年２月１７日　水曜日　午後１時３８分 
						

							92
Trouble Recovery
EMU29427
Troubleshooting
A problem in the fuel, compression, or igni-
tion systems can cause poor starting, loss of
power, or other problems. This section de-
scribes basic checks and possible remedies,
and covers all Yamaha outboard motors.
Therefore some items may not apply to your
model.
If your outboard motor requires repair, bring
it to your Yamaha dealer.
If the engine trouble-alert indicator is flash-
ing, consult your Yamaha dealer.
Starter will not operate.
Q. Is battery capacity weak or low?
A. Check battery condition. Use battery of
recommended capacity.
Q. Are battery connections loose or corrod-
ed?
A. Tighten battery cables and clean battery
terminals.
Q. Is fuse for electric start relay or electric cir-
cuit blown?
A. Check for cause of electric overload and
repair. Replace fuse with one of correct am-
perage.
Q. Are starter components faulty?
A. Have serviced by a Yamaha dealer.
Q. Is shift lever in gear?
A. Shift to neutral.
Engine will not start (starter operates).
Q. Is fuel tank empty?
A. Fill tank with clean, fresh fuel.
Q. Is fuel contaminated or stale?A. Fill tank with clean, fresh fuel.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Q. Is starting procedure incorrect?
A. See page 58.
Q. Has fuel pump malfunctioned?
A. Have serviced by a Yamaha dealer.
Q. Are spark plug(s) fouled or of incorrect
type?
A. Inspect spark plug(s). Clean or replace
with recommended type.
Q. Are spark plug cap(s) fitted incorrectly?
A. Check and re-fit cap(s).
Q. Is ignition wiring damaged or poorly con-
nected?
A. Check wires for wear or breaks. Tighten
all loose connections. Replace worn or bro-
ken wires.
Q. Are ignition parts faulty?
A. Have serviced by a Yamaha dealer.
Q. Is engine shut-off cord (lanyard) not at-
tached?
A. Attach cord.
Q. Are engine inner parts damaged?
A. Have serviced by a Yamaha dealer.
Engine idles irregularly or stalls.
Q. Are spark plug(s) fouled or of incorrect
type?
A. Inspect spark plug(s). Clean or replace
with recommended type.
6C1-9-19.book  92 ページ  ２０１０年２月１７日　水曜日　午後１時３８分 
						

							Trouble Recovery
93
Q. Is fuel system obstructed?
A. Check for pinched or kinked fuel line or
other obstructions in fuel system.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Q. Have ignition parts failed?
A. Have serviced by a Yamaha dealer.
Q. Has alert system activated?
A. Find and correct cause of alert.
Q. Is spark plug gap incorrect?
A. Inspect and adjust as specified.
Q. Is ignition wiring damaged or poorly con-
nected?
A. Check wires for wear or breaks. Tighten
all loose connections. Replace worn or bro-
ken wires.
Q. Is specified engine oil not being used?
A. Check and replace oil as specified.
Q. Is thermostat faulty or clogged?
A. Have serviced by a Yamaha dealer.
Q. Are carburetor adjustments incorrect?
A. Have serviced by a Yamaha dealer.
Q. Is fuel pump damaged?
A. Have serviced by a Yamaha dealer.
Q. Is air vent screw on fuel tank closed?
A. Open air vent screw.
Q. Is choke knob pulled out?A. Return to home position.
Q. Is motor angle too high?
A. Return to normal operating position.
 
Q. Is carburetor clogged?
A. Have serviced by a Yamaha dealer.
Q. Is fuel joint connection incorrect?
A. Connect correctly.
Q. Is throttle valve adjustment incorrect?
A. Have serviced by a Yamaha dealer.
Q. Is battery cable disconnected?
A. Connect securely.
Alert buzzer sounds or indicator lights.
Q. Is cooling system clogged?
A. Check water intake for restriction.
Q. Is engine oil level low?
A. Fill oil tank with specified engine oil.
Q. Is heat range of spark plug incorrect?
A. Inspect spark plug and replace it with rec-
ommended type.
Q. Is specified engine oil not being used?
A. Check and replace oil with specified type.
Q. Is engine oil contaminated or deteriorat-
ed?
A. Replace oil with fresh, specified type.
Q. Is oil filter clogged?
A. Have serviced by a Yamaha dealer.
Q. Has oil feed/injection pump malfunc-
tioned?
A. Have serviced by a Yamaha dealer.
6C1-9-19.book  93 ページ  ２０１０年２月１７日　水曜日　午後１時３８分 
						

							Trouble Recovery
94
Q. Is load on boat improperly distributed?
A. Distribute load to place boat on an even
plane.
Q. Is water pump or thermostat faulty?
A. Have serviced by a Yamaha dealer.
Q. Is there excess water in fuel filter cup?
A. Drain filter cup.
Engine power loss.
Q. Is propeller damaged?
A. Have propeller repaired or replaced.
Q. Is propeller pitch or diameter incorrect?
A. Install correct propeller to operate out-
board at its recommended speed (r/min)
range.
Q. Is trim angle incorrect?
A. Adjust trim angle to achieve most efficient
operation.
Q. Is motor mounted at incorrect height on
transom?
A. Have motor adjusted to proper transom
height.
Q. Has alert system activated?
A. Find and correct cause of alert.
Q. Is boat bottom fouled with marine growth?
A. Clean boat bottom.
Q. Are spark plug(s) fouled or of incorrect
type?
A. Inspect spark plug(s). Clean or replace
with recommended type.
Q. Are weeds or other foreign matter tangledon gear housing?
A. Remove foreign matter and clean lower
unit.
Q. Is fuel system obstructed?
A. Check for pinched or kinked fuel line or
other obstructions in fuel system.
Q. Is fuel filter clogged?
A. Clean or replace filter.
Q. Is fuel contaminated or stale?
A. Fill tank with clean, fresh fuel.
Q. Is spark plug gap incorrect?
A. Inspect and adjust as specified.
Q. Is ignition wiring damaged or poorly con-
nected?
A. Check wires for wear or breaks. Tighten
all loose connections. Replace worn or bro-
ken wires.
Q. Have electrical parts failed?
A. Have serviced by a Yamaha dealer.
Q. Is specified fuel not being used?
A. Replace fuel with specified type.
Q. Is specified engine oil not being used?
A. Check and replace oil with specified type.
Q. Is thermostat faulty or clogged?
A. Have serviced by a Yamaha dealer.
Q. Is air vent screw closed?
A. Open the air vent screw.
Q. Is fuel pump damaged?
A. Have serviced by a Yamaha dealer.
6C1-9-19.book  94 ページ  ２０１０年２月１７日　水曜日　午後１時３８分