Yamaha F60LB Troubleshooting
| Engine Model: Yamaha F60LB |
| Engine Type: 4-stroke inline 4-cylinder SOHC 8-valve gasoline outboard engine |
| Total Displacement: 60.8 cu.in (996 cc) |
| Rated Engine Power: 60 Hp (44.1 kW) at 5500 rpm |
| Fuel System: Electronic Fuel Injection (EFI) |
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| Engine difficult to start or won't start |
No fuel in fuel tank - Fill fuel up.
Wrong grade of gasoline - Change gasoline.
There is air in the fuel system - Bleed the system.
Loose or disconnected spark plug wire - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Install new spark plug.
Fuel filter is clogged - Change fuel filter.
Worn or damaged vapor separator needle valve - Install new needle valve.
Restricted fuel lines - Service fuel lines.
Fuel tank air vent restricted or closed - Open or clean air vent.
Fuel feed pump malfunction - Change or rebuild fuel feed pump.
Damaged or not adjusted choke cable - Adjust properly or replace the cable.
Valve clearance is wrong - Adjustment procedure required.
Valve timing is wrong - Adjust valve timing correctly.
Fuel pressure is low - Check low pressure fuel pump or check system for fuel leaks.
Dirty or faulty fuel injector - Clean or replace if necessary.
Fuel regulator failure - Replace fuel regulator.
Electronic control modul failure - Install new ECM.
| Engine starts but then stops |
Damaged spark plug - Change spark plug as required.
Worn or damaged vapor separator needle valve - Replace needle valve.
Faulty ignition coil - Change ignition coil as required.
Fuel tank air vent restricted or closed - Open or clean air vent.
Fuel pump malfunction - Repair or change fuel pump.
Faulty choke system - Inspect and replace choke system components.
Valve clearance is wrong - Adjustment procedure required.
Valve timing is incorrect - Adjust valve timing correctly.
Valve springs are loose or broken - Install new valve springs.
Valves sticking - Clean the valves.
Poor cylinder compression - Check and repair damaged parts.
Clogged fuel filter - Replace fuel filter.
Fuel injector is damaged or dirty - Clean or replace if necessary.
Engine oil level low - Fill up the engine oil.
Damaged oil pump - Replace oil pump.
Clogged water intake - Clean and wash as required.
Thermostat is faulty - Replace thermostat.
Water pump failure - Water pump need to be replaced.
Defective ignition system - Inspect ignition system and change failed components.
Dirty or damaged fuel pump - Test fuel pump and change if necessary.
Vapor separator needle valve is worn or defective - Change vapor separator needle valve.
Dirty fuel lines - Clean fuel system lines.
Closed or restricted fuel tank air vent - Open or clean air vent.
Dirty fuel filter - Change fuel filter.
Intake manifold air leaks - Replace intake manifold gasket.
Water intake screen is dirty - Clean and wash as required.
Throttle valve and throttle link are damaged or worn - Change faulty components.
Dirty or faulty fuel injector - Clean or replace as required.
Engine overloaded - Load reducing is recommended.
Fuel pump or fuel injector is clogged - Replace or clean if necessary.
Ignition timing is wrong - Adjust ignition timing correctly.
Faulty thermostat - Change thermostat.
Water pump malfunction - Change water pump as required.
Incorrect propeller selection - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard motor is mounted too high or too low - Mount the motor as required.
Engine oil level low - Need to add engine oil.
Damaged oil pump - Replace oil pump.
Water intake is blocked - Need to wash or clean.
Incorrect valve setting - Adjust valves as required.
| Abnormal engine knocking or noise |
Stale fuel - Change fuel.
Engine overload - Load reducing is recommended.
Wrong adjustment of low idle speed - Adjust idling as required.
Dirty or faulty fuel pump - Service or change fuel pump.
Worn main bearings or crankshaft - Repair or replace defective parts.
Damaged piston rings or cylinder bore - Replace defective components.
Restricted fuel lines - Clean fuel lines.
Fuel injector is fault - Change fuel injector.
Dirty or defective fuel pump - Test fuel pump and replace if necessary.
Defective ignition system - Check ignition and replace faulty components.
Damaged cylinder head gasket - Replace cylinder head gasket.
Powerhead components are faulty - Replace defective components.
Valves are stuck or burned - Service or replace valves.
Incorrect propeller selection - Install correct propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Motor mounted at incorrect height on transom - Check the outboard motor mounting height.
Trim angle is incorrect - Adjust trim angle.
| Engine uses too much fuel |
Fuel injector is damaged or dirty - Clean or replace as required.
Defective or loose spark plug - Tighten or replace spark plug.
Worn sleeve, rings, or piston - Replace faulty components as required.
ECU failure - Install new ECU.
| Motor vibrates excessively |
Propeller bent or damaged - Replace propeller.
Propeller shaft damaged - Propeller shaft needs to be replaced.
Weeds clogs the propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten bolt.
Loose or faulty steering pivot Tighten correctly or replace.
Low battery capacity - Charge the battery.
Battery runs out quickly - Service battery or change it.
Wires are disconnected or battery terminals are corroded - Connect cables properly or replace terminals.
Starter motor failing - Change or repair starter.
| Trim motor is running but trim system cannot move up or down |
Oil insufficient - Check oil level and add oil as required.
Pump assembly is faulty - Inspect pump and change as required.
Leakage of manual release valve - Close the valve or change it.
Motor or pump driveshaft faulty - Replace defective component.
| Trim does not fully up or down |
Pump assembly faulty - Change pump.
Tilt ram piston ball is displaced - Clean or repair.
Worn tilt ram piston O-ring - Replace O-ring.
Low oil level - Need to add the oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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