Yamaha F 15 Owners Manual
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Maintenance 55 2. Screw the garden hose connector onto a garden hose which is connected to a fresh water supply. 3. With the engine off, turn on the water tap and let the water flush through the cool- ing passages for about 15 minutes. Turn off the water and disconnect the garden hose. 4. When flushing is complete, reinstall the garden hose connector on the fitting on the bottom cowling. Tighten the connec- tor securely. CAUTION: ECM00540 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 connectorinstead 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: 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 51. EMU28450 Cleaning the outboard motor After use, wash the exterior of the outboard motor with fresh water. Flush the cooling system with fresh water. NOTE: For cooling system flushing instructions, see page 51. EMU28460 Checking painted surface of motor Check the motor for scratches, nicks, or flak- ing paint. Areas with damaged paint are more likely to corrode. If necessary, clean and paint the areas. A touch-up paint is avail- able from your Yamaha dealer. 1. Fitting 2. Garden hose connector 3. Garden hose 1 23 ZMU04887 ZMU02052
Maintenance 56 EMU28486 Periodic maintenance WARNING EWM01070 Be sure to turn off the engine when you perform maintenance unless otherwise specified. If you or the owner is not famil- iar with machine servicing, this work should be done by your Yamaha dealer or other qualified mechanic. 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. EMU28510 Replacement parts If replacement parts are necessary, use only genuine Yamaha parts or parts of the same type and of equivalent strength and materi- als. Any part of inferior quality may malfunc- tion, and the resulting loss of control could endanger the operator and passengers. Yamaha genuine parts and accessories are available from your Yamaha dealer.
Maintenance 57 EMU28522 Maintenance chart Frequency of maintenance operations may be adjusted according to the operating condi- tions, but the following table gives general guidelines. Refer to the sections in this chapter for explanations of each owner-specific action. NOTE: When operating in salt water, turbid or muddy 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 10 hours (1 month)50 hours (3 months)100 hours (6 months)200 hours (1 year) Anode(s) (external)Inspection / replace- ment Anode(s) (internal)Inspection / replace- ment Battery Inspection / charging Cooling water pas- sagesCleaning Cowling clamp Inspection Fuel filter (can be dis- assembled)Inspection / cleaning Fuel system Inspection Fuel tank (Yamaha por- table tank)Inspection / cleaning Gear oil Change Greasing points Greasing Idling speed (carbure- tor models)Inspection Power trim and tilt unit Inspection Propeller and cotter pinInspection / replace- ment Shift link / shift cable Inspection / adjustment ThermostatInspection / replace- ment Throttle link / throttle cable / throttle pick-up timingInspection / adjustment
Maintenance 58 EMU28874 Maintenance chart (additional) EMU28910 NOTE: When using lead or high-sulfur gasoline, inspecting valve clearance may be required more frequently than every 500 hours. Water pumpInspection / replace- ment Engine oil Inspection / change Oil filter (cartridge) Change Spark plug(s)Cleaning / adjustment / replacement Timing beltInspection / replace- ment Valve clearance (OHC, OHV)Inspection / adjustment Item ActionsEvery 500 hours (2.5 years) 1000 hours (5 years) Timing belt Replacement Exhaust guide, exhaust manifoldInspection / replace- ment Item ActionsInitial Every 10 hours (1 month)50 hours (3 months)100 hours (6 months)200 hours (1 year)
Maintenance 59 EMU28931 Greasing Yamaha marine grease (Water resistant grease) F9.9ER, T9.9ER, F15PR ZMU02330
Maintenance 60 F9.9MH, T9.9EH, F15MH, F15EH, F15PH ZMU02331
Maintenance 61 EMU28952 Cleaning and adjusting spark plug WARNING EWM00560 When removing or installing a spark plug, be careful not to damage the insulator. A damaged insulator could allow external sparks, which could lead to explosion or fire. 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. If electrode erosion becomes excessive, or if carbon and other deposits are excessive, you should re- place the spark plug with another of the cor- rect type. Before fitting the spark plug, measure the electrode gap with a wire thickness gauge; adjust the gap to specification if necessary.When fitting the plug, always clean the gas- ket surface and use a new gasket. Wipe off any dirt from the threads and screw in the spark plug to the correct torque. NOTE: 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. EMU28962 Checking fuel system WARNING EWM00060 Gasoline and its vapors are highly flam- mable and explosive. Keep away from sparks, cigarettes, flames, or other Standard spark plug: DPR6EA-9 1. Spark plug gap 2. Spark plug I.D. mark (NGK) Spark plug gap: 0.8–0.9 mm (0.031–0.035 in) Spark plug torque: 18.0 Nm (13.3 ft-lb) (1.84 kgf-m)
Maintenance 62 sources of ignition. WARNING EWM00910 Leaking fuel can result in fire or explo- sion. Check for fuel leakage regularly. If any fuel leakage is found, the fuel system must be repaired by a qualified mechanic. Improper repairs can make the outboard unsafe to operate. Check the fuel lines for leaks, crack, or mal- function. If a problem is found, your Yamaha dealer or other qualified mechanic should re- pair it immediately. Checkpoints Fuel system parts leakage Fuel line joint leakage Fuel line cracks or other damage Fuel connector leakage EMU28980 Inspecting fuel filter WARNING EWM00310 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. Do not perform this procedure on a hot or running engine. Allow the engine to cool. There will be fuel in the fuel filter. Keep away from sparks, cigarettes, flames or other sources of ignition. This procedure will allow some fuel to spill. Catch fuel in a rag. Wipe up any spilled fuel immediately. The fuel filter must be reassembled carefully with the O-ring, filter cup, and hoses in place. Improper assembly or replacement could result in a fuel leak, which could result in a fire or explosion hazard. EMU29001 Cleaning fuel filter 1. Remove the nut holding the fuel filter as- sembly if equipped. ZMU05010 1. Nut ZMU02055 1
Maintenance 63 2. Unscrew the filter cup, catching any spilled fuel in a rag. 3. Remove the filter element, and wash it in solvent. Allow it to dry. Inspect the filter element and O-ring to make sure they are in good condition. Replace them if necessary. If any water is found in the fuel, the Yamaha portable fuel tank or other fuel tanks should be checked and cleaned. 4. Reinstall the filter element in the cup. Make sure the O-ring is in position in the cup. Firmly screw the cup onto the filter housing. 5. Attach the filter assembly to the bracket so that the fuel hoses are attached to the filter assembly. 6. Run the engine and check the filter and lines for leaks. EMU29041 Inspecting idling speed WARNING EWM00451 Do not touch or remove electrical parts when starting or during operation. Keep hands, hair, and clothes awayfrom the flywheel and other rotating parts while the engine is running. CAUTION: ECM00490 This procedure must be performed while the outboard motor is in the water. A flushing attachment or test tank can be used. A diagnostic tachometer should be used for this procedure. Results may vary depending on whether testing is conducted 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. NOTE: Correct idling speed inspection is only possi- ble if the engine is fully warmed up. If not warmed up fully, the idle speed will measure higher than normal. If you have difficulty ver- ifying the idle speed, or the idle speed re- quires adjustment, consult a Yamaha dealer or other qualified mechanic. 2. Verify whether the idle speed is set to specification. For idle speed specifica- tions, see page 48. EMU29073 Changing engine oil WARNING EWM00760 Avoid draining the engine oil immedi- ately after stopping the engine. The oil is hot and should be handled with care to avoid burns. Be sure the outboard motor is securely fastened to the transom or a stable 1. Filter cup 2. Filter element 3. Filter housing 4. O-ring ZMU02079 1 4 2 3
Maintenance 64 stand. CAUTION: ECM00970 Do not overfill the oil, and be sure the outboard motor is upright (not tilted) when checking and changing the en- gine oil. If the oil level is above the upper level mark, drain until the level meets the specified capacity. Overfilling the oil could cause leakage or damage. CAUTION: ECM01240 Change the engine oil after the first 10 hours of operation, and every 100 hours or at 6-month intervals thereafter. Other- wise the engine will wear quickly. NOTE: Change the engine oil when the oil is still warm. 1. Put the outboard motor in an upright po- sition (not tilted). 2. Prepare a suitable container that holds a larger amount than the engine oil capac- ity. Loosen and remove the drain screw while holding the container under the drain hole. Then remove the oil filler cap. Let the oil drain completely. Wipe up any spilled oil immediately.3. Put a new gasket on the oil drain screw. Apply a light coat of oil to the gasket and install the drain screw. NOTE: If a torque wrench is not available when you are installing the drain screw, finger tighten the screw just until the gasket comes into contact with the surface of the drain hole. Then tighten 1/4 to 1/2 turn more. Tighten the drain screw to the correct torque with a torque wrench as soon as possible. 4. Add the correct amount of oil through the filler hole. Install the filler cap. ZMU02049 1. Drain screw Drain screw tightening torque: 28.0 Nm (20.7 ft-lb) (2.86 kgf-m) Recommended engine oil: 4-stroke outboard motor oil Engine oil quantity (excluding oil filter): 1.0 L (1.06 US qt) (0.88 Imp.qt) ZMU02056 1