Yamaha 115 C Service Manual

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4-20
EML08210*
CHECKING PROPELLER
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You could be seriously injured if the
engine accidentally starts while you are
near the propeller.
8Before inspecting, removing or
installing the propeller, remove the
spark plug caps from the spark plugs.
Also, put the shift control in Neutral,
put the main switch in the OFF posi-
tion and remove the key, and remove
the lanyard from the engine stop
switch. Turn off the battery cut-off
switch if your boat has one.
8Do not use your hand to hold the pro-
peller when...

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4-21
[How to remove propeller]
1) Using pliers straighten the cotter-pin and
pull it out.
2) Remove the propeller nut.
3) Remove the propeller.
1Thrust washer4Washer
2Propeller5Propeller nut
3Spacer6Cotter pin
[How to install propeller]
1) Apply Yamaha Marine grease A or
Marine grease (water-resistant grease)
to the propeller-shaft.
2) Slide the propeller over the propeller-
shaft.
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Be sure to install the thrust washer
before installing propeller, otherwise,
lower case and propeller boss may be...

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4-22
EMU01460
CHANGING GEAR OIL
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8Be sure the outboard is securely fas-
tened to the transom or a stable stand.
You could be severely injured if the out-
board falls on you.
8Never get under the lower unit while it
is tilted, even when the tilt-support
lever/knob is locked. Severe injury
could occur if the outboard accidentally
falls.
1) Tilt the outboard motor so that the oil
drain plug is at the lowest point possi-
ble.
2) Place a suitable container under the
gear-case.
3) Remove the oil drain plug...

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4-23
5) With the outboard motor in a vertical
position, and using a flexible or pres-
surized filling device, inject the gear
oil into the oil drain plug hole.
6) When the oil begins to flow out of the
oil level plug hole, insert and tighten
the oil level plug.
7) Insert and tighten the oil drain plug.
000377
603024
405016
Gear oil grade/capacity:
Refer to “SPECIFICATIONS,” page 4-1.
EMU14622
INSPECTING AND REPLACING
ANODE(S)
Yamaha outboard motors are protected
from corrosion by sacrificial anodes....

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4-24
EMU04041
CHECKING BATTERY (for Electric
start models)
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Battery electrolytic fluid is dangerous; it
contains sulfuric acid and therefore is poi-
sonous and highly caustic.
Always follow these preventive mea-
sures:
8Avoid bodily contact with electrolytic
fluid as it can cause severe burns or
permanent eye injury.
8Wear protective eye gear when han-
dling or working near batteries.
Antidote (EXTERNAL):
8SKIN - Flush with water.
8EYES - Flush with water for 15 minutes
and get immediate medical...

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4-25
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8A poorly maintained battery will quick-
ly deteriorate.
8Ordinary tap-water contains minerals
harmful to a battery, and should not be
used for topping-up.
1) Check the electrolyte level at least
once a month. Fill to the manufactur-
er’s recommended level when neces-
sary. Top up only with distilled water
(or pure de-ionized water suitable to
use in batteries).
2) Always keep the battery in a good
state of charge. Installing a voltmeter
will help you monitor your battery. If
you will not use...

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4-26
UPPER  LEVELLOWER  LEVEL
000863
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EMU01304
Connecting the Battery
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Mount the battery holder securely in a
dry, well-ventilated, vibration-free loca-
tion in the boat. Install the fully charged
battery in the holder.
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8Make sure the main switch (on applica-
ble models) is “OFF” before working on
the battery.
8Reversal of the battery leads will dam-
age the rectifier.
8Connect the RED lead first when
installing the battery and disconnect
the RED lead last when removing it.
Otherwise, the...

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4-27
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901013
901014
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EMU01280
Disconnecting the Battery
Disconnect the BLACK lead from the NEG-
ATIVE (-) terminal first. Then disconnect
the RED lead from the POSITIVE (+) termi-
nal.
1Large red lead for starting battery
2Small red lead for accessory battery charg-
ing
3Large black lead
4Battery
8Using an accessory battery
Use a connecting cable between the (-)
terminals of the starting battery and
accessory battery. See the illustrations of
the wiring connections. This cable must
be...

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4-28
EMU01172
CLEANING COOLING-WATER 
PASSAGES
Flushing device equipped model
Perform this procedure right after opera-
tion for the most thorough flushing.
1) After shutting off the engine, unscrew
the garden-hose connector 2from
the fitting 1on the bottom cowling.
2) Screw the garden-hose connector 2
onto a garden hose 3which is con-
nected to a fresh-water supply.
3) With the engine off, turn on the water
tap and let the water flush through
the cooling passages for about 15
minutes. Turn off the...

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4-29
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Do not leave the garden-hose connector
loose on the bottom cowling fitting or let
the hose hang free during normal opera-
tion. Water will leak out of the connector
instead of cooling the engine, which can
cause serious overheating. Be sure the
connector is tightened securely on the fit-
ting after flushing the engine.
NOTE:
8When flushing the engine with the boat
in the water, tilting up the engine until it
is completely out of the water will
achieve better results.
8Refer to cooling system...