Yamaha T60LB Troubleshooting
| Engine Model: Yamaha T60LB |
| 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 doesn't start or difficult to start |
No fuel in fuel tank - Add gasoline.
Improper fuel grade - Change gasoline.
Clogged fuel system - Remove clogging.
Spark plug wire is loose or disconnected - Inspect the spark plug wire connection, replace or repair.
Defective spark plug - Change spark plug as required.
Clogged fuel filter - Fuel filter needs changing.
Worn or damaged vapor separator needle valve - Replace needle valve.
Fuel lines clogging - Clean fuel lines.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Damaged fuel feed pump - Install new feed pump or repair it.
Worn or unadjusted choke cable - Adjust correctly or replace the cable.
Improper valve clearance - Adjust valve clearance according to specifications.
Wrong valve timing - Set the valve timing properly.
Fuel pressure is low - Inspect low pressure fuel pump or inspect fuel system for leaks.
Clogged or worn fuel injector - Clean or replace if necessary.
Fuel regulator is defective - Change fuel regulator.
Electronic control modul is not operating - Change electronic control modul.
| Engine starts and then shuts off |
Spark plug is faulty - Replace spark plug.
Vapor separator needle valve is worn or defective - Replace needle valve.
Damaged ignition coil - Change ignition coil as required.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Faulty fuel pump - Install new fuel pump or rebuild it.
Choke system is damaged - Inspect and replace choke system components.
Incorrect valve clearance - Check and adjust.
Incorrect valve timing - Adjust valve timing as required.
Broken or loose valve springs - Change valve springs.
Valves sticking - Clean the valves.
Poor compression - Check and repair damaged parts.
Dirty fuel filter - Change fuel filter.
Damaged or clogged fuel injector - Clean or replace as required.
Not enough engine oil - Fill up the oil to required level.
Damaged oil pump - Install new oil pump.
Water intake screen is dirty - Need to clean or wash.
Thermostat is defective - Change thermostat.
Damaged water pump - Change water pump as required.
Defective ignition system - Test ignition and replace failed parts.
Dirty or faulty fuel pump - Service or replace fuel pump.
Vapor separator needle valve is damaged or worn - Change vapor separator needle valve.
Dirt in the fuel lines - Fuel lines must be clean.
Fuel tank air vent restricted or closed - Open or service air vent.
Plugged fuel filter - Fuel filter needs changing.
Intake manifold air leaks - Replace intake manifold gasket.
Dirty water intake screen - Clean and wash as required.
Throttle valve and throttle link are damaged or worn - Change faulty components.
Damaged or clogged fuel injector - Clean or replace as required.
Engine is running overloaded - Load reducing required.
Fuel injector or fuel pump is clogged - Clean or replace if necessary.
Ignition timing is incorrect - Set the ignition timing correctly.
Defective thermostat - Replace thermostat.
Water pump is defective - Water pump need to be replaced.
Propeller selection improperly - Replace propeller.
Propeller bent or damaged - Replace propeller.
Outboard motor is mounted too high or too low - Position the engine correctly.
Engine oil level low - Fill up the engine oil.
Faulty oil pump - Oil pump need to be replaced.
Water intake is blocked - Clean and wash as required.
Wrong valve setting - Set the valves properly.
| Abnormal engine noise or knocking |
Low octane gasoline - Change fuel.
Excessive engine load - Reduce the load.
Low idle speed adjustment is incorrect - Need to adjust idle speed.
Dirty or damaged fuel pump - Clean or change fuel pump.
Main bearings or crankshaft failure - Need to install new components.
Piston rings or cylinder bore are damaged - Replace defective components.
Fuel lines are clogged - Clean fuel lines.
Fuel injector is fault - Install new fuel injector.
Dirty or faulty fuel pump - Clean or install new fuel pump.
Ignition system is defective - Check ignition system and replace faulty parts.
Cylinder head gasket is damaged - Install new head gasket.
Powerhead parts are faulty - Change defective parts.
Valves are burned or stuck - Clean or change valves.
Propeller pitch or diameter incorrect - Check the propeller size.
Damaged or bent propeller - Replace propeller.
Engine mounted at wrong transom height - Check the outboard engine mounting height.
Improper trim angle - Adjust trim angle correctly.
| Excessive fuel consumption |
Fuel injector is clogged or malfunction - Clean or install new injector.
Spark plug is defective or loose - Replace or tighten spark plug.
Sleeve, rings, or piston are damaged - Replace faulty parts.
ECU is not functioning - Replace ECU.
| Excessive engine vibration |
Damaged or bent propeller - Replace propeller.
Propeller shaft malfunction - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten bolt.
Steering pivot is loose or damaged Tighten correctly or replace.
Low battery output voltage - Battery is drained, charge it.
Battery is draining quickly - Service charging system or install new battery.
Wires are disconnected or battery terminals are corroded - Check cable connections and replace or service terminals.
Starter motor is faulty - Change or repair starter.
| Trim motor runs but trim system does not move up or down |
Oil insufficient - Need to add the oil.
Defective pump assembly - Check pump and replace if necessary.
Leakage of manual drain valve - Valve need to be closed or changed.
Motor or pump driveshaft faulty - Change worn component.
| Trim cannot be fully up or down |
Defective pump assembly - Replace pump.
Tilt ram piston ball is in wrong position - Clean or repair.
Tilt ram piston O-ring damaged - Change O-ring.
Low oil level - Check and refill oil.
Lower check valve is not properly secured in port side trim ram - Secure valve properly.
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