Mercury Racing 360 APX Problems
| Engine Model: Mercury Racing 360 APX |
| Engine Type: 4-stroke 8-cylinder DOHC 32-valve gasoline outboard engine |
| Total Displacement: 279 cu.in (4.6 L) |
| Rated Engine Power: 360 Hp (268 kW) at 7000 rpm |
| Fuel System: Electronic Fuel Injection (EFI) |
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| Engine difficult to start or will not start |
Gas tank is empty - Add gasoline.
Incorrect fuel grade - Use correct fuel grade.
Water or air in fuel system - Remove air or water from system.
Damaged spark plug wiring connection - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Change spark plug as required.
Fuel filter is clogged - Change fuel filter.
Vapor separator needle valve is damaged or worn - Install new needle valve.
Dirt in the fuel lines - Service fuel lines.
Closed or restricted fuel tank air vent - Open or service air vent.
Fuel feed pump defective - Change or rebuild fuel feed pump.
Choke cable is unadjusted or damaged - Adjust properly or change the cable.
Excessive valve clearance - Adjust valve clearance.
Valve timing is incorrect - Adjust valve timing as required.
Fuel pressure is low - Check system for fuel leaks or check low pressure fuel pump.
Dirty or faulty fuel injector - Clean or replace as required.
Fuel regulator is faulty - Change fuel regulator.
ECM is not functioning - Replace ECM.
| Engine stalls after starting |
Spark plug is faulty - Replace spark plug.
Vapor separator needle valve is damaged or worn - Replace needle valve.
Damaged ignition coil - Change ignition coil as required.
Closed or restricted fuel tank air vent - Open or clean air vent.
Fuel pump defective - Change or rebuild fuel pump.
Damaged choke system - Check and repair choke system.
Excessive valve clearance - Check and adjust.
Valve timing is incorrect - Set the valve timing properly.
Valve springs are worn or loose - Replace valve springs.
Valves sticking - Clean the valves.
Weak cylinder compression - Check and change damaged parts.
Dirty fuel filter - Install new filter.
Fuel injector is dirty or worn - Clean or install new injector.
Engine oil level is insufficient - Need to add engine oil.
Faulty oil pump - Change oil pump.
Water intake is clogged - Wash or clean as required.
Thermostat is faulty - Change thermostat.
Water pump failure - Install new water pump.
Ignition failure - Inspect ignition system and change failed components.
Fuel pump is clogged or faulty - Service or replace fuel pump.
Vapor separator needle valve is bend or wear - Replace needle valve.
Dirt in the fuel lines - Service fuel lines.
Fuel tank air vent clogged or closed - Open or service air vent.
Plugged fuel filter - Install new filter.
Intake manifold is air leaking - Install new gasket.
Water intake is blocked - Wash or clean as required.
Throttle valve and throttle link are damaged or worn - Change faulty components.
Fuel injector is dirty or worn - Clean or replace as required.
Engine overloaded - Reduce load.
Clogged fuel pump or fuel injector - Clean or replace as required.
Ignition timing is improper - Adjust ignition timing correctly.
Defective thermostat - Thermostat need to be replaced.
Faulty water pump - Change water pump.
Incorrect propeller selection - Check the propeller size.
Damaged or improper size of propeller - Replace propeller.
Outboard engine is mounted too high or too low - Position the engine correctly.
Engine oil level is insufficient - Check oil level and add oil as required.
Damaged oil pump - Install new oil pump.
Water intake is blocked - Clean and wash as required.
Valve setting is improper - Adjust valves correctly.
Stale fuel - Use proper fuel.
Excessive engine load - Load reducing required.
Low idle speed setting is not correct - Adjust idling as required.
Dirty or faulty fuel pump - Inspect fuel pump and change as required.
Main bearings or crankshaft failure - Worn parts replacement required.
Worn cylinder bore or piston rings - Change faulty parts.
Dirt in the fuel lines - Fuel lines need to be cleaned.
Damaged fuel injector - Replace fuel injector.
Dirty or damaged fuel pump - Service or replace fuel pump.
Ignition failure - Check ignition and replace faulty components.
Blown cylinder head gasket - Install new cylinder head gasket.
Faulty powerhead parts - Change defective parts.
Valves are burned or stuck - Service or change valves.
Improper propeller diameter or pitch - Replace propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Motor mounted at incorrect height on transom - Adjust the engine to correct transom height.
Incorrect trim angle - Adjust trim angle.
| Engine uses too much fuel |
Clogged or worn fuel injector - Clean or install new injector.
Defective or loose spark plug - Replace or tighten spark plug.
Worn sleeve, rings, or piston - Replace defective parts as required.
ECU is not functioning - Change electronic control unit.
Propeller bent or damaged - Have propeller repaired or replaced.
Propeller shaft malfunction - Replace propeller shaft.
Weeds in the propeller - Remove weeds from propeller.
Engine mounting bolt is not tightened - Tighten the bolt as required.
Damaged or loose steering pivot Tighten correctly or replace.
Battery capacity is low - Battery is drained, charge it.
Battery runs out quickly - Battery needs to be serviced or replaced.
Disconnected cables or faulty battery terminals - Connect wires correctly or change terminals.
Starter motor is damaged - Repair or replace starter.
| Trim motor runs but trim system does not move up or down |
Oil insufficient - Check oil level and add oil as required.
Pump assembly is faulty - Check pump and replace if necessary.
Leakage of manual drain valve - Valve need to be closed or changed.
Faulty pump driveshaft or motor - Replace worn component.
| Trim does not fully up or down |
Defective pump assembly - Replace pump.
Tilt ram piston ball is displaced - Clean or repair.
Damaged tilt ram piston O-ring - Replace O-ring.
Oil level is insufficient - Check and refill oil.
Lower check valve not seating in port side trim ram - Secure valve properly.
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