Yamaha F 15 Owners Manual
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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. Recheck the oil level using the dipstick to be sure the level falls between the up- per and lower marks. Fill with oil if it is below the lower mark, or drain to the specified level if it is above the upper mark.7. Dispose of used oil according to local regulations. NOTE: 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. EMU29112 Checking wiring and connectors Check that each grounding wire is properly secured. Check that each connector is engaged se- curely. EMU29120 Exhaust leakage Start the engine and check that no exhaust leaks from the joints between the exhaust cover, cylinder head, and body cylinder. EMU29130 Water leakage Start the engine and check that no water leaks from the joints between the exhaust cover, cylinder head, and body cylinder. EMU29140 Engine oil leakage Check for oil leaks on the around the engine. NOTE: If any leaks are found, consult your Yamaha dealer. ZMU02057 ZMU02058 ZMU02087
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 switches on the remote control and engine bottom cowl- ing (if equipped) to check that all switch- es work. 3. Tilt the outboard motor up and check that the trim and tilt rod / the tilt rod is pushed out completely. 4. Check that the trim and tilt rod / the tilt rod is free of corrosion or other flaws. 5. Tilt the outboard motor down. Check that the trim and tilt rod / the tilt rod oper- ates smoothly. NOTE: Consult your Yamaha dealer if any operation is abnormal. EMU29171 Checking propeller WARNING EWM00321 You could be seriously injured if the en- gine accidentally starts when you are near the propeller. Before inspecting, removing, or install- ing the propeller, remove the spark plug caps from the spark plugs. Also, place the shift control in neutral, turn the main switch to “” (off) and re- move the key, and remove the lanyard from the engine stop switch. Turn off the battery cut-off switch if your boat has one. Do not use your hand to hold the pro- peller when loosening or tightening the propeller nut. Put a wood block be- tween the anti-cavitation plate and the propeller to prevent the propeller from turning. 1. Tilt rod ZMU02059
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. The propeller will then spin freely on the shaft. If this happens, the shear pin must be replaced. EMU30660 Removing the propeller EMU29194 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). 3. Remove the propeller and thrust wash- er. EMU29212 Dual thrust models 1. Straighten the cotter pin and pull it out using a pair of pliers. ZMU01897 1. Cotter pin 2. Propeller nut 3. Washer 4. Propeller 5. Thrust washer 1. Cotter pin 2. Propeller nut 1 ZMU02062 2 3 4 5 6 43 1 2 5ZMU02329
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 a cor- rosion resistant grease to the propeller shaft. 2. Install the spacer (if equipped), thrust washer, and propeller on the propeller shaft. 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. 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. EMU29262 Dual thrust 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 a cor- rosion resistant grease to the propeller shaft. 2. Install the thrust washer and propeller on the propeller shaft. Install the deflec- tor on the propeller. 3. Install the washer and tighten the pro- peller 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. 3. Washer 4. Deflector 5. Propeller 6. Thrust washer ZMU02063
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 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. NOTE: If the magnetic gear oil drain screw equipped: remove all metal particles from the screw before installing it. 4. Remove the oil level plug to allow the oil to drain completely. CAUTION: ECM00710 Inspect the used oil after it has been drained. If the oil is milky, water is getting into the gear case which can cause gear damage. Consult a Yamaha dealer for re- pair of the lower unit seals. NOTE: For disposal of used oil consult your Yamaha dealer. 5. With the outboard motor in a vertical po- sition, and using a flexible or pressur- ized filling device, inject the gear oil into ZMU02063 1. Gear oil drain screw 2. Oil level plug ZMU02064 2 1
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 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. 4. Clean the filter (located on the end of the Recommended gear oil: Hypoid gear oil SAE#90 Gear oil quantity: F15EH 250.0 cm 3 (8.45 US oz) (8.82 Imp.oz) F15MH 250.0 cm 3 (8.45 US oz) (8.82 Imp.oz) F15PH 250.0 cm 3 (8.45 US oz) (8.82 Imp.oz) F15PR 250.0 cm 3 (8.45 US oz) (8.82 Imp.oz) F9.9ER2 250.0 cm 3 (8.45 US oz) (8.82 Imp.oz) F9.9MH2 250.0 cm 3 (8.45 US oz) (8.82 Imp.oz) FT9.9DWH 370.0 cm 3 (12.51 US oz) (13.05 Imp.oz) T9.9EH2 370.0 cm 3 (12.51 US oz) (13.05 Imp.oz) T9.9ER2 370.0 cm 3 (12.51 US oz) (13.05 Imp.oz) ZMU02065 ZMU02066
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, as this would render them ineffective. NOTE: 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. EMU29320 Checking battery (for electric start models) WARNING EWM00330 Battery electrolytic fluid is dangerous; it contains sulfuric acid and therefore is poisonous and highly caustic. Always follow these preventive mea- sures: Avoid bodily contact with electrolytic fluid as it can cause severe burns or permanent eye injury. Wear protective eye gear when han- dling or working near batteries. Antidote (EXTERNAL): SKIN - Flush with water. EYES - Flush with water for 15 minutes and get immediate medical attention. Antidote (INTERNAL): Drink large quantities of water or milk ZMU02067 ZMU02924
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 CHILDREN. CAUTION: ECM00360 A poorly maintained battery will quickly deteriorate. Ordinary 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 manufacturer’s rec- ommended level when necessary. Top up only with distilled water (or pure de- ionized water suitable to use in batter- ies). 2. Always keep the battery in a good stateof charge. Installing a voltmeter will help you monitor your battery. If you will not use the boat for a month or more, re- move the battery from the boat and store it in a cool, dark place. Completely re- charge the battery before using it. 3. If the battery will be stored for longer than a month, check the specific gravity of the fluid at least once a month and re- charge the battery when it is low. NOTE: Consult a Yamaha dealer when charging or re-charging batteries. EMU29331 Connecting the battery WARNING EWM00570 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. CAUTION: ECM01121 Make sure the main switch (on applica- ble models) is “” (off) before work- ing on the battery. Reversal of the battery cables will dam- age the electrical parts. Connect the red battery cable first when installing the battery and discon- nect the black battery cable first when removing it. Otherwise, the electrical parts can be damaged. The electrical contacts of the battery and cables must be clean and properly connected, or the battery will not start the engine. Connect the red battery cable to the POSI- TIVE (+) terminal first. Then connect the black battery cable to the NEGATIVE (-) ter-
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 necessary, the boat bottom can be coated with an anti-foul- ing paint approved for your area to inhibitmarine growth. Do not use anti-fouling paint which includes copper or graphite. These paints can cause more rapid engine corrosion. 1. Red cable 2. Black cable 3. Battery ZMU02068 ZMU01943
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 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 30. 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 stop switch lanyard not at- tached? A. Attach lanyard. 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.