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| Home / Outboard Engines / Mercury Engines / Mercury 10 Viking |
Mercury 10 Viking Troubleshooting
| Engine starts hard or doesn't start |
Gas tank is empty - Fill it up.
Wrong fuel grade - Change fuel.
Air trapped in fuel system - Bleed air.
Damaged spark plug wiring connection - Check spark plug wiring connection, repair or change.
Spark plug is defective - Install new spark plug.
Clogged fuel filter - Install new filter.
Carburetor problems - Carburetor diagnostics required.
Dirty fuel lines - Clean fuel system lines.
Closed or clogged fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Fuel pump pressure is low - Install new fuel pump or rebuild it.
| Engine starts but stalls suddenly |
Spark plug is faulty - Change spark plug as required.
Carburetor is dirty or defective - Clean or replace carburetor.
Ignition coil is faulty - Ignition coil should be replaced.
Closed or restricted fuel tank air vent - Fuel tank air vent need to be opened or cleaned.
Low fuel pump pressure - Repair or change fuel pump.
Defective thermal relief valve - Replace thermal relief valve.
| Rough engine running |
Ignition system is defective - Test ignition and replace failed parts.
Fuel pump is dirty or defective - Clean or change fuel pump.
Wrong carburetor adjustment - Adjusting carburetor correctly.
Fuel lines are clogged - Clean fuel lines.
Closed or restricted fuel tank air vent - Open or service air vent.
Plugged fuel filter - Fuel filter needs changing.
Worn gaskets - Replace gaskets.
| Engine overheating |
Engine overloaded - Reduce the load.
Carburetor mixture is too lean - Set the carburetor correctly.
Ignition timing is incorrect - Set the ignition timing properly.
Faulty thermostat - Change thermostat.
Defective water pump - Install new water pump.
| Engine knocking sound or abnormal noise |
Low octane gasoline - Change gasoline.
Engine is under excessive load - Load reducing is recommended.
Incorrectly set low idle speed - Test and adjust.
Fuel pump is damaged or dirty - Clean or replace fuel pump.
Main bearings or crankshaft wear - Change defective components as required.
Cylinder bore or piston rings are damaged - Change defective components.
| Engine lacks power |
Carburetor is clogged or improperly adjusted - Adjust the carburetor correctly or clean it.
Dirty or defective fuel pump - Check fuel pump and change if required.
Ignition system failure - Inspect ignition system and change faulty parts.
Damaged gaskets - Install new gaskets.
Powerhead components are damaged - Replace defective components as required.
| Excessive fuel consumption |
Carburetor main jet adjustment is improper - Adjust main jet as required.
Loose or defective spark plug - Spark plug need to be replaced or tightened.
Worn rings, piston, or sleeve - Replace defective parts as required.
| Trim motor runs but system does not move |
Lack of oil - Need to add the oil.
Damaged pump assembly - Test pump and change if necessary.
Leakage of manual release valve - Close the valve fully or replace it.
Pump driveshaft or motor damaged - Change defective component.
| Trim does not fully up or down |
Defective pump assembly - Change pump.
Tilt ram piston ball is not positioned correctly - Service or repair.
Tilt ram piston O-ring is worn - Replace O-ring.
Oil level is insufficient - Checking oil level and add if necessary.
Lower check valve is not properly secured in port side trim ram - Secure valve properly.
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| Engines Technical Specifications |