Johnson GT-150 V6 Troubleshooting
| Engine Model: Johnson GT-150 V6 |
| Engine Type: 2-stroke 6-cylinder gasoline outboard engine |
| Total Displacement: 158 cu.in (2.6 L) |
| Rated Engine Power: 150 Hp (110 kW) at 5750 rpm |
| Fuel System: Downdraft carburetors |
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| Engine will not start or difficult to start |
No gasoline in tank - Add fuel.
Wrong grade of gasoline - Use correct fuel grade.
Air trapped in fuel system - Bleed air.
Loose or disconnected spark plug wire - Check the spark plug wire connection, repair or replace.
Spark plug is defective - Change spark plug.
Fuel filter is plugged - Replace or clean fuel filter.
Carburetor is not adjusted - Check carburetor float adjustment.
Restricted fuel lines - Clean fuel lines.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Low fuel pump pressure - Install new pump or repair it.
Worn or faulty reed valve - Install new reed valve.
| Engine starts and then stalls |
Defective spark plug - Change spark plug as required.
Defective or clogged carburetor - Clean or change carburetor.
Ignition coil is faulty - Replace ignition coil as necessary.
Closed or clogged fuel tank air vent - Open or service air vent.
Lack of fuel pump pressure - Replace or rebuild fuel pump.
Ignition system malfunction - Inspect ignition system and change faulty parts.
Fuel pump is faulty or clogged - Service or change fuel pump.
Carburetor malfunction - Check and repair as required.
Restricted fuel lines - Clean fuel lines.
Closed or restricted fuel tank air vent - Open or clean air vent.
Clogged fuel filter - Replace or clean fuel filter.
Damaged gaskets - Replace gaskets.
Engine is overloaded - Reduce load.
Too lean carburetor mixture - Adjust carburetor correctly.
Ignition timing is improper - Ignition timing needs to be adjusted correctly.
Defective thermostat - Thermostat need to be replaced.
Water pump failure - Change water pump as required.
Propeller pitch or diameter incorrect - Install correct propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Position the engine correctly.
| Engine knocking sound or abnormal noise |
Low octane fuel - Change fuel.
Engine is running overloaded - Reduce engine load.
Wrong adjustment of low idle speed - Correct idle adjustment.
Dirty or defective fuel pump - Check fuel pump and change if required.
Main bearings or crankshaft failure - Worn parts replacement required.
Cylinder bore or piston rings are worn - Change defective components.
Carburetor is clogged or incorrectly adjusted - Adjust the carburetor properly or clean it.
Fuel pump is clogged or faulty - Test fuel pump and replace if necessary.
Ignition system malfunction - Check ignition and replace faulty components.
Gaskets are damaged - Change gaskets.
Powerhead components are worn - Change defective parts.
Improper propeller diameter or pitch - Check the propeller size.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard motor mounting height is set incorrectly - Have motor adjusted to proper transom height.
Incorrect trim angle - Adjust trim angle.
| Engine using too much gasoline |
Carburetor main jet is incorrectly adjusted - Adjust main jet as required.
Defective or loose spark plug - Re-tighten or replace spark plug.
Sleeve, rings, or piston are damaged - Replace defective components.
| Excessive engine vibration |
Damaged or improper size of propeller - Have propeller repaired or replaced.
Propeller shaft damaged - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove and clean propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Loose or faulty steering pivot Tighten correctly or replace.
Battery power is low - Low battery charging, charge as required.
Battery does not hold charge - Service charging system or install new battery.
Disconnected cables or faulty battery terminals - Connect wiring correctly or install new terminals.
Faulty starter motor - Repair or change starter.
| Trim motor is running but trim system cannot move up or down |
Oil level is low - Need to add the oil.
Defective pump assembly - Inspect pump and change as required.
Manual shut-off valve leaks - Valve need to be closed or changed.
Faulty pump driveshaft or motor - Change worn component.
| Trim does not fully up or down |
Pump assembly is damaged - Change pump.
Tilt ram piston ball is not positioned correctly - Service or repair.
Tilt ram piston O-ring damaged - Install new O-ring.
Oil level is insufficient - Check oil level and add oil as required.
Lower check valve is not properly secured in port side trim ram - Secure valve properly.
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