Mercury 150 SeaPro Troubleshooting
| Engine Model: Mercury SeaPro 150 |
| Engine Type: 4-stroke inline 4-cylinder SOHC 8-valve gasoline outboard engine |
| Total Displacement: 183 cu.in (3 L) |
| Rated Engine Power: 150 Hp (110 kW) at 5300 rpm |
| Fuel System: Multi-Point Electronic Fuel Injection (EFI) |
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| Engine won't start or starts hard |
Empty fuel tank - Add fuel.
Improper fuel grade - Use quality gasoline.
Fuel system clogged - Repair or replace.
Spark plug wire is disconnected or loose - Check spark plug wiring connection, repair or change.
Spark plug is damaged - Install new spark plug.
Fuel filter is plugged - Install new filter.
Worn or defective vapor separator needle valve - Change vapor separator needle valve.
Fuel lines are dirty - Fuel lines must be clean.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Damaged fuel feed pump - Replace or rebuild fuel feed pump.
Not adjusted or damaged throttle cable - Replace cable or adjust properly.
Valve clearance is incorrect - Adjust to proper valve clearance.
Improper valve timing - Set the valve timing properly.
Fuel pressure is low - Check system for fuel leaks or check low pressure fuel pump.
Clogged or worn fuel injector - Replace or clean if necessary.
Fuel regulator is not operating - Change fuel regulator.
Electronic control modul is not operating - Install new ECM.
| Engine starts but then stops |
Faulty spark plug - Install new spark plug.
Vapor separator needle valve is damaged or worn - Install new needle valve.
Defective ignition coil - Replace ignition coil as necessary.
Closed or clogged fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Defective fuel pump - Repair or change fuel pump.
Choke system is damaged - Check and repair choke system.
Valve clearance is improper - Adjust valve clearance according to specifications.
Incorrect valve timing - Set the valve timing correctly.
Valve springs are loose or broken - Install new valve springs.
Stuck valves - Service the valves.
Poor cylinder compression - Check and repair damaged parts.
Clogged fuel filter - Replace or clean fuel filter.
Dirty or faulty fuel injector - Clean or replace if necessary.
Lack of engine oil - Fill up the oil to required level.
Oil pump is defective - Change oil pump.
Water intake is blocked - Clean and wash as required.
Thermostat failure - Thermostat need to be replaced.
Water pump failure - Change water pump as required.
Ignition system malfunction - Check ignition and replace faulty components.
Clogged or damaged fuel pump - Service or replace fuel pump.
Worn or damaged vapor separator needle valve - Change vapor separator needle valve.
Fuel lines clogging - Service fuel lines.
Fuel tank air vent closed or restricted - Open or clean air vent.
Dirty fuel filter - Change fuel filter.
Intake manifold air leaks - Replace intake manifold gasket.
Clogged water intake - Need to wash or clean.
Throttle valve and throttle link are defective or worn - Replace faulty components.
Fuel injector is faulty or clogged - Clean or replace if necessary.
Engine is running overloaded - Load reducing required.
Fuel injector or fuel pump is dirty - Clean or replace if necessary.
Wrong ignition timing - Ignition timing needs to be set properly.
Damaged thermostat - Install new thermostat.
Water pump failure - Install new water pump.
Propeller pitch or diameter incorrect - Replace propeller.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Outboard engine is mounted too high or too low - Mount the motor as required.
Engine oil level is low - Check and refill engine oil.
Oil pump failure - Change oil pump.
Water intake is clogged - Need to wash or clean.
Wrong valve setting - Valves needs to be set correctly.
| Abnormal engine knocking or noise |
Stale gasoline - Use correct fuel.
Engine is running overloaded - Reduce load.
Incorrect low idle setting - Adjust as required.
Fuel pump is dirty or defective - Check fuel pump and change if required.
Crankshaft or main bearings are worn out - Replace crankshaft or bearings.
Cylinder bore or piston rings are damaged - Replace defective parts.
Fuel lines are dirty - Fuel lines need to be cleaned.
Faulty fuel injector - Check fuel injector and change if required.
Fuel pump is damaged or dirty - Inspect fuel pump and change as required.
Ignition system failure - Check ignition and replace faulty components.
Defective cylinder head gasket - Install new cylinder head gasket.
Powerhead parts are faulty - Defective parts need to be replaced.
Valves are burned or stuck - Change or service valves.
Incorrect propeller selection - Check the propeller size.
Propeller bent or damaged - Replace propeller.
Outboard motor mounting height is set incorrectly - Adjust the engine to correct transom height.
Improper trim angle - Adjust trim angle.
| Engine using too much gasoline |
Fuel injector is faulty or clogged - Replace or clean if necessary.
Faulty or loose spark plug - Re-tighten or change the spark plug.
Worn rings, piston, or sleeve - Replace faulty components.
ECU failure - Change electronic control unit.
| Excessive engine vibration |
Propeller bent or damaged - Replace propeller.
Propeller shaft damaged - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Damaged or loose steering pivot Tighten or replace.
Low battery power - Low battery charging, charge as required.
Battery will not hold charge - Battery needs to be serviced or replaced.
Disconnected cables or faulty battery terminals - Check wire connections and change or service terminals.
Damaged starter motor - Repair or install a new starter.
| Trim motor runs but trim system does not move up or down |
Not enough oil - Check and refill oil.
Pump assembly is defective - Inspect pump and change as required.
Leakage of manual drain valve - Close the valve or change it.
Motor or pump driveshaft faulty - Replace defective component.
| Trim cannot be fully up or down |
Damaged pump assembly - Change pump.
Tilt ram piston ball is not positioned correctly - Service or repair.
Damaged tilt ram piston O-ring - Change O-ring.
Oil insufficient - Need to add the oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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