Mariner 150 Magnum problems
| Engine Model: Mariner Magnum 150 Hp |
| Engine Type: 2-stroke 6-cylinder gasoline outboard engine |
| Total Displacement: 153 cu.in (2507 cc) |
| Rated Engine Power: 150 Hp (111.8 kW) at 6500 rpm |
| Fuel System: Electronic fuel injection (EFI) |
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| Engine won't start or starts hard |
Empty gas tank - Fill gasoline up.
Improper fuel grade - Use correct gasoline grade.
Air in fuel tank - Bleed fuel tank.
Loose or disconnected spark plug wire - Check spark plug wiring connection, repair or change.
Damaged spark plug - Spark plug need to be replaced.
Plugged fuel filter - Fuel filter needs to be replaced.
Fuel lines are dirty - Clean fuel lines.
Discharged or faulty battery - Need to charge or replace the battery.
Damaged wiring harness connections - Check electrical wire harness connections.
Ignition system is damaged - Replace defective components.
Faulty pulse fuel pump - Replace pulse fuel pump.
Electric fuel pump is faulty - Change electric fuel pump.
ECM is faulty - Install new ECM.
| Engine starts but then stops |
Spark plug is faulty - Change spark plug.
Ignition coil is defective - Ignition coil must be replaced.
Pulse fuel pump failure - Replace pulse fuel pump.
Fuel system is dirty - Service fuel system.
Dirty final fuel filter - Final filter needs to be replaced.
Faulty electric fuel pump - Replace electric fuel pump.
Ignition system malfunction - Test ignition and replace failed parts.
Fuel pump is clogged or faulty - Clean or change fuel pump.
Clogged fuel lines - Fuel lines need to be cleaned.
Fuel filter is dirty - Replace fuel filter.
Excessive engine load - Reduce engine load.
Bad ignition timing - Set the ignition timing correctly.
Faulty thermostat - Install new thermostat.
Damaged water pump - Water pump need to be replaced.
| Abnormal engine knocking or noise |
Low octane fuel - Use proper gasoline.
Engine overload - Load reducing is recommended.
Low idle speed set incorrectly - Correct idle adjustment.
Fuel pump is clogged or faulty - Test fuel pump and change if necessary.
Worn crankshaft or main bearings - Replace crankshaft or bearings.
Piston rings or cylinder bore are damaged - Replace defective parts.
Fuel pump is dirty or defective - Service or change fuel pump.
Ignition system is defective - Check ignition system and replace faulty parts.
Powerhead components are damaged - Replace defective parts.
Stator, coil, or switch box defective - Replace faulty parts.
Low compression - Correct.
Fuel supply problem - Check and repair.
Manifold fuel leak - Leak must be repaired.
Vapor separator flooding over - Check and correct malfunction.
| Engine using too much gasoline |
Spark plug is faulty or loose - Change or re-tighten spark plug.
Piston, sleeve, or rings are damaged - Replace defective parts.
Excessive engine load - Load reducing required.
Clogged or damaged fuel injectors - Check fuel injectors and replace if necessary.
| Excessive motor vibration |
Propeller bent or damaged - Replace propeller.
Damaged propeller shaft - Propeller shaft needs to be replaced.
Weeds wraped around propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten the bolt as required.
Steering pivot is loose or damaged - Tighten correctly or replace.
Propeller bent or damaged - Have propeller repaired or replaced.
Propeller shaft malfunction - Propeller shaft needs to be replaced.
Weeds wraped around propeller - Remove weeds from propeller.
Motor mounting bolt is loose - Tighten bolt.
| Trim motor runs but system does not move |
Lack of oil - Need to add the oil.
Pump assembly is damaged - Check pump and change if required.
Leakage of manual release valve - Close the valve or change it.
Motor or pump driveshaft faulty - Change worn component.
| Trim cannot be fully up or down |
Defective pump assembly - Replace pump.
Tilt ram piston ball is not positioned correctly - Clean or repair.
Damaged tilt ram piston O-ring - Change O-ring.
Insufficient oil - Check and refill oil.
Lower check valve not seating in port side trim ram - Install valve correctly.
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