Mercury 115 Optimax Troubleshooting
| Engine Model: Mercury Optimax 115 |
| Engine Type: 2-stroke inline 3-cylinder gasoline outboard engine |
| Total Displacement: 93 cu.in (1.5 L) |
| Rated Engine Power: 115 Hp (84.5 kW) at 5700 rpm |
| Fuel System: Direct Fuel Injection (DFI) |
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| Engine starts hard or won't start |
Fuel tank is empty - Fill it up.
Low-quality gasoline - Use quality fuel.
Air in the fuel system - Air bleeding.
Damaged spark plug wiring connection - Inspect spark plug wiring connection, change or repair.
Defective spark plug - Change spark plug as required.
Dirty fuel filter - Replace or clean fuel filter.
Fuel lines clogging - Clean fuel lines.
Low fuel pressure - Inspect fuel system for leaks or inspect low pressure fuel pump.
Low air pressure - Check air system components.
Wiring harness connections are damaged - Check wiring harness connections.
Ignition system malfunction - Check ignition components and replace if necessary.
Damaged fuel feed pump - Change fuel feed pump.
Fuel injector is faulty or clogged - Replace or clean if necessary.
Electronic control modul is not operating - Change electronic control modul.
Worn or faulty reed valve - Replace reed valve.
| Engine stops after starting |
Faulty spark plug - Spark plug need to be replaced.
Ignition coil is damaged - Replace ignition coil as necessary.
Damaged fuel pump - Replace fuel pump.
Restrictions in fuel system - Fuel system need to be cleaned.
Dirty fuel filter - Change fuel filter.
Ignition system failure - Check ignition and replace faulty components.
Spark plug is defective - Spark plug need to be replaced.
Fuel pump is clogged or faulty - Clean or replace fuel pump.
Low air pressure - Normalize air pressure.
Fuel lines are clogged - Fuel lines must be clean.
Fuel filter is dirty - Fuel filter needs to be replaced.
Faulty direct injector - Replace if necessary.
Engine overloaded - Reduce engine load.
Improper ignition timing - Ignition timing needs to be adjusted correctly.
Thermostat is faulty - Change thermostat.
Water pump is defective - Change water pump as required.
Propeller pitch or diameter incorrect - Install correct propeller.
Propeller bent or damaged - Have propeller repaired or replaced.
Outboard engine is positioned too low or too high - Mount the motor as required.
Low octane gasoline - Change gasoline.
Engine is running overloaded - Load reducing required.
Low idle speed adjustment is incorrect - Adjust as required.
Clogged or damaged fuel pump - Service or replace fuel pump.
Main bearings or crankshaft are worn out - Repair or replace defective parts.
Damaged piston rings or cylinder bore - Change defective components.
Fuel pump is dirty or defective - Test fuel pump and change if necessary.
Ignition system problems - Check ignition system and replace faulty parts.
Powerhead parts are damaged - Defective components need to be replaced.
Low fuel pressure - Inspect fuel system for leaks or inspect low pressure fuel pump.
Low air pressure - Check air system components.
Bad compression - Correct it.
Fuel supply problem - Check and repair.
Fuel regulator leaks - Repair leaks.
Dirty fuel filter - Fuel filter needs to be replaced.
Damaged or clogged fuel injector - Replace or clean if necessary.
Manifold fuel leak - Repair leaks.
Propeller pitch or diameter incorrect - Check the propeller size.
Damaged or improper size of propeller - Have propeller repaired or replaced.
Motor mounted at incorrect height on transom - Check the outboard engine mounting height.
Trim angle is incorrect - Make the correct trim angle adjustment.
Faulty or loose spark plug - Replace or tighten spark plug.
Sleeve, piston, or rings are damaged - Change faulty components.
Excessive engine load - Reduce the load.
Fuel injectors are dirty or defective - Clean or change fuel injectors.
| Motor vibrates excessively |
Propeller bent or damaged - Have propeller repaired or replaced.
Propeller shaft damaged - Replace propeller shaft.
Weeds in the propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Steering pivot is faulty or loose - Tighten or replace.
| Starter motor is not working |
Propeller bent or damaged - Have propeller repaired or replaced.
Propeller shaft malfunction - Propeller shaft needs to be replaced.
Weeds in the propeller - Remove and clean propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
| Trim motor is running but trim system cannot move up or down |
Oil level is low - Check and refill oil.
Damaged pump assembly - Test pump and replace if necessary.
Leakage of manual drain valve - Close the valve or change it.
Broken motor or pump driveshaft - Change defective component.
| Trim cannot be fully up or down |
Damaged pump assembly - Replace pump.
Tilt ram piston ball is displaced - Service or repair.
Worn tilt ram piston O-ring - Install new O-ring.
Low oil level - Fill up oil.
Lower check valve not seating in port side trim ram - Install valve correctly.
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