Mercury 400 V10 Verado Problems
| Engine Model: Mercury Verado 400 V10 |
| Engine Type: 4-stroke 10-cylinder DOHC 40-valve gasoline outboard engine |
| Total Displacement: 349 cu.in (5.7 L) |
| Rated Engine Power: 400 Hp (298 kW) at 6400 rpm |
| Fuel System: Electronic fuel injection (EFI) |
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| Engine doesn't start or hard to start |
Fuel tank is empty - Fill fuel up.
Wrong fuel grade - Use quality fuel.
Dirty fuel system - Check and clean.
Disconnected or loose spark plug wire - Check spark plug wiring connection, repair or change.
Defective spark plug - Change spark plug.
Fuel filter is plugged - Change fuel filter.
Vapor separator needle valve is worn or defective - Install new needle valve.
Dirty fuel lines - Fuel lines must be clean.
Closed or restricted fuel tank air vent - Open or service air vent.
Defective fuel feed pump - Replace or repair fuel pump.
Worn or improperly adjusted choke cable - Adjust properly or replace the cable.
Excessive valve clearance - Need to adjust valve clearance.
Wrong valve timing - Set the valve timing correctly.
Fuel pressure is low - Inspect low pressure fuel pump or inspect fuel system for leaks.
Fuel injector is clogged or malfunction - Clean or replace if necessary.
Fuel regulator is faulty - Install new fuel regulator.
ECM is faulty - Change electronic control modul.
| Engine stops after starting |
Damaged spark plug - Replace spark plug.
Damaged or wear vapor separator needle valve - Replace needle valve.
Faulty ignition coil - Change ignition coil as required.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel pump malfunction - Replace or rebuild fuel pump.
Choke system is damaged - Check and repair choke system.
Valve clearance is improper - Adjust valve clearance.
Improper valve timing - Set the valve timing properly.
Weak or damaged valve springs - Replace valve springs.
Valves are stuck - Clean the valves.
Low cylinder compression - Check and change damaged parts.
Fuel filter is plugged - Change fuel filter.
Fuel injector is dirty or worn - Clean or install new injector.
Insufficient engine oil - Checking oil level and add if necessary.
Oil pump failure - Replace oil pump.
Water intake screen is dirty - Need to clean or wash.
Defective thermostat - Replace thermostat.
Water pump is defective - Change water pump.
Ignition system is defective - Check ignition system and replace faulty parts.
Dirty or defective fuel pump - Test fuel pump and replace if necessary.
Vapor separator needle valve is damaged or worn - Install new needle valve.
Dirty fuel lines - Clean fuel lines.
Fuel tank air vent restricted or closed - Fuel tank air vent need to be opened or cleaned.
Plugged fuel filter - Replace or clean fuel filter.
Intake manifold air leaks - Install new gasket.
Clogged water intake - Need to clean or wash.
Throttle valve and throttle link are defective or worn - Replace faulty parts.
Clogged or worn fuel injector - Replace or clean as required.
Excessive engine load - Reduce load.
Clogged fuel pump or fuel injector - Clean or replace as required.
Wrong ignition timing - Adjust ignition timing correctly.
Damaged thermostat - Replace thermostat.
Water pump malfunction - Water pump need to be replaced.
Improper propeller diameter or pitch - Check the propeller size.
Damaged or improper size of propeller - Replace propeller.
Outboard motor is mounted too high or too low - Mount the motor as required.
Engine oil level is low - Check and refill engine oil.
Damaged oil pump - Oil pump need to be replaced.
Water intake is blocked - Wash or clean as required.
Valve setting is wrong - Adjust valves as required.
Stale gasoline - Change fuel.
Engine overload - Reduce engine load.
Incorrect low idle setting - Adjust idling as required.
Dirty or damaged fuel pump - Inspect fuel pump and change as required.
Crankshaft or main bearings failure - Install new parts as as required.
Damaged cylinder bore or piston rings - Change faulty parts.
Fuel lines are clogged - Clean fuel system lines.
Defective fuel injector - Test fuel injector and replace if necessary.
Dirty or faulty fuel pump - Test fuel pump and change if necessary.
Defective ignition - Inspect ignition system and change failed components.
Cylinder head gasket is defective - Install new cylinder head gasket.
Damaged powerhead components - Replace defective components.
Valves are stuck or burned - Clean or change valves.
Propeller selection improperly - Replace propeller.
Damaged or bent propeller - Have propeller repaired or replaced.
Outboard motor mounting height is set incorrectly - Adjust the engine to correct transom height.
Improper trim angle - Adjust trim angle correctly.
Fuel injector is faulty or clogged - Clean or replace if necessary.
Defective or loose spark plug - Re-tighten or change the spark plug.
Rings, sleeve, or piston are damaged - Replace defective parts.
ECU failure - Install new ECU.
| Engine vibrates excessively |
Propeller bent or damaged - Have propeller repaired or replaced.
Damaged propeller shaft - Have propeller shaft replaced.
Weeds clogs the propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten bolt.
Damaged or loose steering pivot Tighten or replace.
Battery capacity is low - Battery is drained, recharge it.
Battery will not hold charge - Service charging system or change battery.
Wires are disconnected or battery terminals are corroded - Connect wiring correctly or install new terminals.
Starter motor is defective - Starter needs to be replaced.
| Trim motor is running but trim system cannot move up or down |
Low oil level - Fill up oil.
Damaged pump assembly - Check pump and change if required.
Manual release valve leaking - Close the valve or change it.
Broken motor or pump driveshaft - Replace 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 damaged - Change O-ring.
Oil insufficient - Check and refill oil.
Lower check valve not seating in port side trim ram - Install valve correctly.
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