Poor Performance; No Fuel Or Faulty Fuel Supply; Engine Will Not Start, Starter Does Not Turn; Excessive Engine Temperature - Mercury TDI 3.0L Owner's Operation And Maintenance Manual

Poor Performance

Possible Cause
Throttle not fully open.
Damaged or improper propeller.
Excessive bilge water.
Boat overloaded or improperly distributed.
Boat bottom fouled or damaged.
Electronic fuel system fault.
Faulty turbocharger outlet air temperature sensor. Replace.

No Fuel or Faulty Fuel Supply

The fuel cock is closed.
There is no fuel in the tank.
The fuel tank is dirty.
The fuel lines are clogged.
The water level in the circulation filter (if equipped) is too high.
The circulation filter (if equipped) is clogged.
The water level is too high in the fuel filter.
The fuel filter is clogged.

Engine Will Not Start, Starter Does Not Turn

The throttle lever is not in the neutral position.
The neutral switch in the gearbox does not output a signal.
The lanyard stop switch is activated.
The ignition is switched off.
The battery is discharged or defective.
The starter connections are loose or corroded.
The connections to the ignition or starter switch are loose or
corroded.
There is air inside the fuel system.

Excessive Engine Temperature

Possible Cause
Water inlet or seacock closed.
Drive belt loose or in poor condition.
Seawater pickups or sea strainer obstructed.
Faulty thermostat.
Coolant level low in closed‑cooling section.
Heat exchanger cores plugged with foreign material.
Loss of pressure in closed‑cooling section.
Faulty seawater pickup pump.
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Possible Cause
Possible Cause
Inspect throttle cable and linkages for proper operation.
Replace propeller. See a Mercury Diesel–authorized repair facility.
Drain and check for cause of entry.
Reduce load or redistribute more evenly.
Clean or repair as necessary.
Have electronic fuel system checked by a Mercury Diesel–authorized
repair facility.
Open the fuel cock.
Fill the tank. Refer to Purging the Fuel System.
Clean the fuel tank.
Check the lines and clean them if necessary.
Drain the water from the circulation filter.
Clean the circulation filter or replace it if necessary.
Drain the water from the fuel filter.
Replace the fuel filter.
Move the throttle lever into neutral.
Check the operation of the neutral switch.
Reset the lanyard stop switch.
Switch on the ignition.
Check the battery and charge it. Replace the battery if
necessary.
Check the connections and clean or replace if necessary.
Check the connections and clean or replace if necessary.
Refer to Purging the Fuel System. Contact an authorized
Mercury Diesel repair facility for assistance.
Open.
Replace or adjust belt.
Remove obstruction.
Replace. See a Mercury Diesel–authorized repair facility.
Check for cause of low coolant level and repair. Fill system with
proper coolant solution.
Clean heat exchanger. See a Mercury Diesel–authorized repair
facility.
Check for leaks. Clean, inspect, and test pressure cap. See a
Mercury Diesel–authorized repair facility.
Repair. See a Mercury Diesel–authorized repair facility.
Section 6 - Troubleshooting
Remedy
Remedy
Remedy
Remedy
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