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Home / Outboard Engines / Mercury Engines / Mercury 175 XRI

Mercury XRI 175 Troubleshooting

Engine Model: Mercury XRI 175 Hp

Engine Type: 2-cycle 6-cylinder gasoline outboard engine

Total Displacement: 153 cu.in (2507 cc)

Rated Engine Power: 175 Hp (130.5 kW) at 5600 rpm

Fuel System: Electronic fuel injection (EFI)

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Engine won't start or starts hard

No gasoline in tank - Fill fuel up.
Incorrect fuel grade - Change fuel.
Water or air in fuel system - Remove air or water from system.
Spark plug wiring connection is damaged - Check spark plug wiring connection, repair or change.
Faulty spark plug - Replace spark plug.
Fuel filter is plugged - Change fuel filter.
Clogged fuel lines - Fuel lines need to be cleaned.
Drained or defective battery - Charge or change the battery.
Wiring harness connections are damaged - Inspect harness connections.
Damaged ignition system - Check ignition components and replace if necessary.
Pulse fuel pump is defective - Pulse fuel pump need to be replaced.
Damaged electric fuel pump - Change electric fuel pump.
ECM is faulty - Replace ECM.

Engine starts and stalls suddenly

Damaged spark plug - Install new spark plug.
Ignition coil is not working - Change ignition coil as required.
Damaged pulse fuel pump - Pulse fuel pump need to be replaced.
Fuel system clogging - Fuel system need to be cleaned.
Plugged final fuel filter - Change final filter.
Defective electric fuel pump - Electric fuel pump need to be replaced.

Engine runs roughly

Defective ignition system - Inspect ignition system and change failed components.
Fuel pump is clogged or faulty - Check fuel pump and replace if necessary.
Restricted fuel lines - Fuel lines must be clean.
Fuel filter is plugged - Change fuel filter.

Engine keeps overheating

Engine is running overloaded - Reduce engine load.
Ignition timing is improper - Adjust ignition timing as required.
Defective thermostat - Thermostat need to be replaced.
Damaged water pump - Change water pump.

Engine knocking sound or abnormal noise

Low octane fuel - Change fuel.
Excessive engine load - Load reducing required.
Low idle speed setting is incorrect - Adjust as required.
Fuel pump is faulty or clogged - Test fuel pump and change if necessary.
Worn crankshaft or main bearings - Change defective components as required.
Piston rings or cylinder bore are worn - Change defective components.

Lack of engine power

Fuel pump is clogged or faulty - Test fuel pump and change if necessary.
Ignition system malfunction - Check ignition and replace faulty components.
Powerhead parts are worn out - Replace defective components.
Failed switch box, stator, or coil - Replace damaged components.
Low compression - Normalize compression.
Fuel supply problem - Check fuel system.
Manifold fuel leak - Leak must be repaired.
Vapor separator flooding over - Check and correct malfunction.

High fuel consumption

Defective or loose spark plug - Replace or tighten spark plug.
Sleeve, rings, or piston are damaged - Replace faulty components.
Engine overload - Reduce load.
Dirty or damaged fuel injectors - Test fuel injectors and change if necessary.

Trim motor is running but system can't move

Lack of oil - Check oil level and add oil as required.
Defective pump assembly - Test pump and change if necessary.
Leakage of manual release valve - Close the valve or change it.
Motor or pump driveshaft faulty - Change defective component.

Trim does not fully up or down

Damaged pump assembly - Change pump as required.
Tilt ram piston ball is displaced - Service or repair.
Tilt ram piston O-ring damaged - 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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