Yamaha F15 Owners Manual

 
Maintenance 
65 
5. Start the engine and watch to make sure
the low oil pressure warning indicator (if
equipped) turns off. Make sure that
there are no oil leaks.
CAUTION:
 
ECM00680  
If the low oil pressure warning indicator
does not turn off or if there are oil leaks,
stop the engine and find the cause. Con-
tinued operation with a problem could
cause severe engine damage. Consult
your Yamaha dealer if the problem can- 
not be located and corrected. 
6. Turn off the engine and wait 3 minutes....

 
Maintenance 
66 
EMU29162 
Checking power trim and tilt / power 
tilt system
WARNING
 
EWM00430  
 
Never get under the lower unit while it
is tilted, even when the tilt support lever
is locked. Severe injury could occur if
the outboard motor accidentally falls. 
 
Make sure no one is under the outboard 
motor before performing this test. 
1. Check the power trim and tilt unit / the
power tilt unit for any sign of oil leaks.
2. Operate each of the power trim and tilt
switches / the power tilt...

 
Maintenance 
67 
Checkpoints 
 
Check each of the propeller blades for
wear, erosion from cavitation or ventila-
tion, or other damage. 
 
Check the propeller shaft for damage. 
 
Check the splines / shear pin for wear or
damage. 
 
Check for fish line tangled around the pro-
peller shaft. 
 
Check the propeller shaft oil seal for dam-
age.
NOTE:
 
If the shear pin equipped: it is designed to
break if the propeller hits a hard underwater
obstacle to help protect the propeller and
drive mechanism....

 
Maintenance 
68 
2. Remove the propeller nut and washer.
3. Remove the deflector, propeller, and
thrust washer. 
EMU30670 
Installing the Propeller 
EMU29231 
Spline models
CAUTION:
 
ECM00340  
 
Be sure to install the thrust washer be-
fore installing the propeller, otherwise
the lower case and propeller boss
could be damaged. 
 
Be sure to use a new cotter pin and
bend the ends over securely. Otherwise
the propeller could come off during op- 
eration and be lost. 
1. Apply Yamaha marine grease or...

 
Maintenance 
69
NOTE:
 
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. 
EMU29281 
Changing gear oil
WARNING
 
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 lever
or knob is locked. Severe injury...

 
Maintenance 
70 
the gear oil drain screw 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 gear oil drain
screw. 
EMU29302 
Cleaning fuel tank
WARNING
 
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...

 
Maintenance 
71 
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. 
EMU29312 
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.
CAUTION:
 
ECM00720  
Do not paint anodes,...

 
Maintenance 
72 
followed by milk of magnesia, beaten
egg, or vegetable oil. Get immediate
medical attention.
Batteries also generate explosive hydro-
gen gas; therefore, you should always
follow these preventive measures: 
 
Charge batteries in a well-ventilated ar-
ea. 
 
Keep batteries away from fire, sparks,
or open flames (for example: welding
equipment, lighted cigarettes, and so
on.) 
 
DO NOT SMOKE when charging or han-
dling batteries.
KEEP BATTERIES AND ELECTROLYTIC 
FLUID OUT OF REACH OF...

 
Maintenance 
73 
minal. 
EMU29370 
Disconnecting the battery 
Disconnect the BLACK cable from the NEG-
ATIVE (-) terminal first. Then disconnect the
RED cable from the POSITIVE (+) terminal. 
EMU29390 
Checking top cowling 
Check the fitting of the top cowling by push-
ing it with both hands. If it is loose have it re-
paired by your Yamaha dealer. 
EMU29400 
Coating the boat bottom 
A clean hull improves boat performance. The
boat bottom should be kept as clean of ma-
rine growth as possible. If...

 
74 
Trouble Recovery 
EMU29424 
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 warning indicator is
flashing, consult your Yamaha dealer. 
Starter will not operate. 
Q. Is...