Mercury Racing 200 APX Problems
| Engine Model: Mercury Racing 200 APX |
| Engine Type: 4-stroke 6-cylinder DOHC 24-valve gasoline outboard engine |
| Total Displacement: 209 cu.in (3.4 L) |
| Rated Engine Power: 200 Hp (149 kW) at 6800 rpm |
| Fuel System: Electronic Fuel Injection (EFI) |
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| Engine starts hard or will not start |
No fuel in fuel tank - Fill it up.
Wrong grade of gasoline - Use correct fuel grade.
Dirty fuel system - Check and clean.
Spark plug wiring connection is damaged - Check spark plug wiring connection, repair or change.
Damaged spark plug - Change spark plug as required.
Fuel filter is clogged - Fuel filter needs changing.
Worn or damaged vapor separator needle valve - Replace needle valve.
Restricted fuel lines - Clean fuel lines.
Fuel tank air vent restricted or closed - Open or service air vent.
Fuel feed pump is faulty - Repair or change fuel feed pump.
Worn or improperly adjusted choke cable - Adjust properly or change the cable.
Valve clearance is incorrect - Adjustment procedure required.
Incorrect valve timing - Adjust valve timing correctly.
Low fuel pressure - Check low pressure fuel pump or check system for fuel leaks.
Fuel injector is clogged or malfunction - Clean or replace if necessary.
Fuel regulator failure - Install new fuel regulator.
ECM is not functioning - Replace ECM.
| Engine starts but stops suddenly |
Spark plug is defective - Replace spark plug.
Worn or damaged vapor separator needle valve - Change vapor separator needle valve.
Damaged ignition coil - Change ignition coil as required.
Fuel tank air vent clogged or closed - Open or service air vent.
Fuel pump malfunction - Replace or repair fuel pump.
Damaged choke system - Change choke system components as required.
Improper valve clearance - Adjust valve clearance according to specifications.
Valve timing is wrong - Adjust valve timing correctly.
Worn or loose valve springs - New valve springs need to be installed.
Valves sticking - Clean the valves.
Low compression - Check and replace worn parts.
Dirty fuel filter - Install new filter.
Dirty or faulty fuel injector - Clean or install new injector.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Oil pump malfunction - Oil pump need to be replaced.
Dirty water intake screen - Need to wash or clean.
Thermostat is faulty - Replace thermostat.
Water pump malfunction - Replace water pump.
| Engine runs intermittently |
Ignition system malfunction - Inspect ignition system and change failed components.
Fuel pump is dirty or defective - Service or change fuel pump.
Worn or defective vapor separator needle valve - Replace needle valve.
Fuel lines clogging - Clean fuel lines.
Fuel tank air vent closed or restricted - Fuel tank air vent need to be opened or cleaned.
Clogged fuel filter - Fuel filter needs to be replaced.
Intake manifold is air leaking - Replace intake manifold gasket.
Water intake is blocked - Clean and wash as required.
Throttle link and throttle valve are wear or damaged - Change faulty parts.
Fuel injector is clogged or malfunction - Clean or install new injector.
Excessive engine load - Load reducing is recommended.
Fuel injector or fuel pump is dirty - Clean or replace if necessary.
Ignition timing is improper - Set the ignition timing correctly.
Thermostat failure - Change thermostat.
Faulty water pump - Change water pump.
Improper propeller diameter or pitch - Install correct propeller.
Propeller bent or damaged - Replace propeller.
Outboard motor is mounted too high or too low - Mount the motor as required.
Not enough engine oil - Add oil to the engine crankcase.
Oil pump failure - Replace oil pump.
Dirty water intake screen - Need to clean or wash.
Incorrect valve setting - Set the valves correctly.
Low octane fuel - Change fuel.
Engine overload - Reduce load.
Incorrectly set low idle speed - Need to adjust idle speed.
Clogged or defective fuel pump - Inspect fuel pump and change as required.
Main bearings or crankshaft failure - Install new parts as as required.
Damaged piston rings or cylinder bore - Change faulty components.
Fuel lines are dirty - Clean fuel lines.
Damaged fuel injector - Install new fuel injector.
Fuel pump is dirty or defective - Inspect fuel pump and change as required.
Defective ignition - Inspect ignition system and change failed components.
Cylinder head gasket is blown - Replace cylinder head gasket.
Powerhead parts are worn out - Defective components need to be replaced.
Valves are stuck or burned - Replace or service valves.
Improper propeller diameter or pitch - Replace propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard motor mounting height is set incorrectly - Check the outboard motor mounting height.
Incorrect trim angle - Adjust trim angle.
Fuel injector is clogged or malfunction - Replace or clean as required.
Spark plug is faulty or loose - Re-tighten or change the spark plug.
Worn rings, piston, or sleeve - Replace faulty components.
ECU is faulty - Replace ECU.
Damaged or bent propeller - Replace propeller.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds in the propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten bolt.
Damaged or loose steering pivot Tighten or replace.
Battery voltage is low - Low battery charging, charge as required.
Battery won’t hold charge - Battery needs service or replacement.
Faulty battery terminals or disconnected cables - Check cable connections and change or clean terminals.
Starter motor is damaged - Starter needs to be changed.
| Trim motor runs but trim system does not move up or down |
Oil level low - Fill up oil to required level.
Pump assembly is defective - Check pump and change if required.
Manual release valve leaking - Valve need to be closed or changed.
Motor or pump driveshaft faulty - Change worn component.
| Trim does not fully up or down |
Pump assembly faulty - Replace pump.
Tilt ram piston ball is in wrong position - Service or repair.
Tilt ram piston O-ring is worn - Install new O-ring.
Oil level is low - Fill up oil to required level.
Lower check valve not seating in port side trim ram - Secure valve properly.
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