Yamaha F60AET Troubleshooting
| Engine Model: Yamaha F60AET |
| Engine Type: 4-stroke inline 4-cylinder OHC 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: Carburetors |
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| Engine starts up hard or won't start |
Fuel tank is empty - Fill it up.
Incorrect fuel grade - Use quality fuel.
Air in fuel tank - Bleed fuel tank.
Spark plug wiring connection is defective - Check spark plug wiring connection, repair or change.
Defective spark plug - Install new spark plug.
Fuel filter is plugged - Replace or clean fuel filter.
Carburetor is not adjusted - Check carburetor float adjustment.
Fuel lines are clogged - Clean fuel lines.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel pump defective - Change or rebuild fuel pump.
Throttle cable is adjusted incorrectly or damaged - Change cable or adjust properly.
Excessive valve clearance - Adjust valve clearance according to specifications.
Valve timing is improper - Adjust valve timing correctly.
| Engine starts and stalls suddenly |
Spark plug is faulty - Change spark plug as required.
Clogged or defective carburetor - Replace or service carburetor.
Defective ignition coil - Change ignition coil as required.
Fuel tank air vent restricted or closed - Open or clean air vent.
Faulty fuel pump - Change or rebuild fuel pump.
Choke system malfunction - Change choke system components as required.
Valve clearance is wrong - Check and adjust.
Valve timing is incorrect - Set the valve timing correctly.
Valve springs are broken or bad - Replace valve springs.
Stuck valves - Service the valves.
Ignition system malfunction - Check ignition and replace faulty components.
Fuel pump is faulty or clogged - Check fuel pump and replace if necessary.
Carburetor not adjusted - Adjust according to instructions.
Restricted fuel lines - Fuel lines must be clean.
Closed or restricted fuel tank air vent - Open or service air vent.
Fuel filter is dirty - Replace fuel filter.
Gaskets are defective - Replace gaskets.
Water intake is clogged - Need to clean or wash.
Choke system malfunction - Change choke system components as required.
Engine is running overloaded - Load reducing is recommended.
Too lean fuel mixture in carburetor - Set the carburetor correctly.
Incorrect ignition timing - Adjust ignition timing correctly.
Damaged thermostat - Install new thermostat.
Damaged water pump - Change water pump as required.
Propeller pitch or diameter incorrect - Install correct propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Mount the motor as required.
Lack of engine oil - Check oil level and add oil as required.
Oil pump is defective - Change oil pump as required.
Dirty water intake screen - Wash or clean as required.
Wrong valve setting - Set the valves properly.
| Engine knocking sound or abnormal noise |
Low octane gasoline - Use proper fuel.
Excessive engine load - Reduce the load.
Incorrectly adjusted low idle speed - Test and adjust.
Fuel pump is dirty or defective - Clean or change fuel pump.
Main bearings or crankshaft failure - Worn parts replacement required.
Piston rings or cylinder bore are damaged - Replace defective parts.
Carburetor is clogged or incorrectly adjusted - Carburetor needs to be adjusted correctly or cleaned.
Fuel pump is damaged or dirty - Service or replace fuel pump.
Ignition system problems - Check ignition system and replace faulty parts.
Damaged cylinder head gasket - Replace the gasket as required.
Powerhead parts are worn out - Defective components need to be replaced.
Stuck or burned valves - Change or service valves.
Improper propeller diameter or pitch - Replace propeller.
Propeller bent or damaged - Replace propeller.
Incorrect outboard motor mounting height - Have motor adjusted to proper transom height.
Incorrect trim angle - Adjust trim angle correctly.
| Engine uses too much fuel |
Improper carburetor main jet adjustment - Adjust it correctly.
Loose or faulty spark plug - Spark plug need to be tightened or replaced.
Worn rings, piston, or sleeve - Replace faulty parts.
| Engine vibrates excessively |
Damaged or bent propeller - Replace propeller.
Damaged propeller shaft - Replace propeller shaft.
Weeds clogs the propeller - Clean the propeller.
Motor mounting bolt is loose - Tighten bolt.
Damaged or loose steering pivot Tighten correctly or replace.
| Starter motor is not working |
Low battery capacity - Recharge the battery.
Battery discharges quickly - Service or change the battery.
Terminals are faulty or battery cables are disconnected - Connect cables correctly or replace terminals.
Starter motor failing - Replace or repair starter.
| Trim motor is running but trim system cannot move up or down |
Not enough oil - Fill up oil.
Defective pump assembly - Check pump and replace if necessary.
Leakage of manual release valve - Close the valve fully or replace it.
Pump driveshaft or motor damaged - Replace defective component.
| Trim does not fully up or down |
Pump assembly is defective - Change pump.
Tilt ram piston ball is in wrong position - Service or repair.
Worn tilt ram piston O-ring - Change O-ring.
Low oil level - Check oil level and add oil as required.
Lower check valve not seating in port side trim ram - Install valve correctly.
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| Outboard Engines Technical Specifications |
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