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| Home / Outboard Engines / Mercury Engines / Mercury 60 Bigfoot |
Mercury 60 Bigfoot Troubleshooting
| Engine will not start or starts up hard |
No gasoline in tank - Fill it up.
Low-quality gasoline - Use correct gasoline grade.
Air in the fuel system - Air bleeding.
Defective wiring connection of spark plug - Check spark plug wiring connection, repair or change.
Spark plug is defective - Spark plug need to be replaced.
Fuel filter is plugged - Replace or clean fuel filter.
Restricted fuel lines - Clean fuel system lines.
Drained or defective battery - Charge or replace the battery.
Damaged wiring harness connections - Check wiring harness connections.
Defective ignition system - Change defective parts.
Defective pulse fuel pump - Change pulse fuel pump as required.
Damaged electric fuel pump - Install new electric fuel pump.
Electronic control modul failure - Replace ECM.
| Engine starts and then shuts off |
Faulty spark plug - Replace spark plug.
Faulty ignition coil - Install a new ignition coil.
Pulse fuel pump is faulty - Replace pulse fuel pump.
Fuel system clogging - Service fuel system.
Dirty final fuel filter - Install new final filter.
Electric fuel pump is faulty - Replace electric fuel pump.
| Engine runs unevenly |
Ignition system problems - Check ignition and replace faulty components.
Fuel pump is clogged or faulty - Test fuel pump and change if necessary.
Fuel lines clogging - Fuel lines need to be cleaned.
Fuel filter is clogged - Replace or clean fuel filter.
| Engine keeps overheating |
Excessive engine load - Reduce the load.
Bad ignition timing - Set the ignition timing properly.
Thermostat is faulty - Change thermostat.
Faulty water pump - Water pump need to be replaced.
| Engine knocking sound or abnormal noise |
Low octane fuel - Change gasoline.
Engine is running overloaded - Reduce the load.
Low idle speed adjustment is incorrect - Correct idle settings.
Fuel pump is dirty or defective - Clean or replace fuel pump.
Crankshaft or main bearings wear - Replace crankshaft or bearings.
Damaged piston rings or cylinder bore - Change faulty components.
| Lack of engine power |
Clogged or defective fuel pump - Service or replace fuel pump.
Ignition system is defective - Test ignition and replace failed parts.
Powerhead components are worn - Replace defective parts.
Failed switch box, stator, or coil - Change damaged parts.
Bad compression - Correct.
Fuel supply problem - Check fuel system.
Manifold is leaking - Leak must be repaired.
Vapor separator flooding over - Normalize vapor separator functions.
| High fuel consumption |
Spark plug is loose or defective - Re-tighten or change the spark plug.
Worn piston, rings, or sleeve - Replace faulty components.
Excessive engine load - Reduce engine load.
Dirty or faulty fuel injectors - Service or replace fuel injectors.
| Trim motor is running but system can't move |
Lack of oil - Check and refill oil.
Defective pump assembly - Test pump and replace if necessary.
Leakage of manual release valve - Close the valve or change it.
Pump driveshaft or motor damaged - Change defective component.
| Trim cannot be fully up or down |
Defective pump assembly - Change pump as required.
Tilt ram piston ball is in wrong position - Service or repair.
Damaged tilt ram piston O-ring - Replace O-ring.
Lack of oil - Fill up oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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| Engines Technical Specifications |