Poor Performance
Possible Cause Remedy
Throttle not fully open. Inspect throttle cable and linkages for proper operation.
Damaged or improper propeller. Replace propeller. See a Mercury Diesel–authorized repair facility.
Excessive bilge water. Drain and check for cause of entry.
Boat overloaded or improperly distributed. Reduce load or redistribute more evenly.
Boat bottom fouled or damaged. Clean or repair as necessary.
Electronic fuel system fault.
Have electronic fuel system checked by a Mercury Diesel–authorized
repair facility.
Faulty turbocharger outlet air temperature sensor. Replace.
No Fuel or Faulty Fuel Supply
Possible Cause
Remedy
The fuel cock is closed. Open the fuel cock.
There is no fuel in the tank.
Fill the tank. Refer to Purging the Fuel System.
The fuel tank is dirty. Clean the fuel tank.
The fuel lines are clogged. Check the lines and clean them if necessary.
The water level in the circulation filter (if equipped) is too high. Drain the water from the circulation filter.
The circulation filter (if equipped) is clogged. Clean the circulation filter or replace it if necessary.
The water level is too high in the fuel filter. Drain the water from the fuel filter.
The fuel filter is clogged. Replace the fuel filter.
Engine Will Not Start, Starter Does Not Turn
Possible Cause
Remedy
The throttle lever is not in the neutral position. Move the throttle lever into neutral.
The neutral switch in the gearbox does not output a signal. Check the operation of the neutral switch.
The lanyard stop switch is activated. Reset the lanyard stop switch.
The ignition is switched off. Switch on the ignition.
The battery is discharged or defective.
Check the battery and charge it. Replace the battery if
necessary.
The starter connections are loose or corroded. Check the connections and clean or replace if necessary.
The connections to the ignition or starter switch are loose or
corroded.
Check the connections and clean or replace if necessary.
There is air inside the fuel system.
Refer to Purging the Fuel System. Contact an authorized
Mercury Diesel repair facility for assistance.
Excessive Engine Temperature
Possible Cause
Remedy
Water inlet or seacock closed. Open.
Drive belt loose or in poor condition. Replace or adjust belt.
Seawater pickups or sea strainer obstructed. Remove obstruction.
Faulty thermostat. Replace. See a Mercury Diesel–authorized repair facility.
Coolant level low in closed‑cooling section.
Check for cause of low coolant level and repair. Fill system with
proper coolant solution.
Heat exchanger cores plugged with foreign material.
Clean heat exchanger. See a Mercury Diesel–authorized repair
facility.
Loss of pressure in closed‑cooling section.
Check for leaks. Clean, inspect, and test pressure cap. See a
Mercury Diesel–authorized repair facility.
Faulty seawater pickup pump. Repair. See a Mercury Diesel–authorized repair facility.
Section 6 - Troubleshooting
90-8M0145546 eng MAY 2018 Page 95
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