Nanni 4.390 TDI, User Manual, Page: 23 / 24

User manual
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Fault observed : Engine does not start up / starter does not turn
Cause Corrective action
Breaker open or fuse has burnt
Electrical breaker does not operate Check and reinstall the breaker or replace the fuse or
have the breaker repaired (TQAN)
Control not in neutral Place the lever in the neutral position
Battery switch open Close the switch
Electrical connections are faulty Check all the connections and electrical wires
(especially the battery cables). Clean and tighten the
connections.
Battery is faulty Test and charge, or replace if battery is bad
Wrong startup procedure Read and apply the startup procedure
Fuel reservoir empty or fuel valve closed Fill the reservoir and open the valve
Fuel pump faulty Replace pump (TQAN)
Throttle control malfunction Check play on throttle control
Fuel filters fouled or water present Clean or replace fuel filters or drain water from prefilter
Fuel contaminated or too old Empty reservoir if polluted and fill with clean fuel
Fuel line or air line of reservoir blocked or bent Replace twisted lines or blow compressed air into lines
to remove obstruction (TQAN)
Air present in fuel injection system Purge injection system
Engine does not turn smoothly (jumps and jolts, stalls
…)
Throttle control malfunction Check linkage for any jams or twisting
Idle speed too low Check idle speed and adjust it accordingly.
Turn adjustment screw clockwise to increase engine idle
speed or counter-clockwise to decrease engine idle speed
(TQAN)
Air and fuel filters fouled Clean/Replace filters (TQAN)
Fuel contaminated or too old Empty reservoir if polluted and fill with clean fuel
Fuel line or air line of reservoir blocked or bent Replace twisted lines or blow compressed air into lines
to remove obstruction (TQAN)
Air present in fuel ejection system Purge injection system
Engine coolant temperature too high
Engine overheats / Engine coolant temperature too high
Seawater valve is closed Open seawater valve
Seawater filter obstructed Close seawater valve and clean filter
Seawater intake pump sucks in air Check position and tightness of seawater filter cover,
and suction hose
Fresh water circuit pump belt is loose or faulty Re-tension belt or replace belt
Seawater pump rotor is faulty Replace rotor
Quantity of coolant is insufficient Top up and check tightness of cooling system
Thermostat malfunction Replace thermostat (TQAN)
Cooling system obstructed Locate position of problem and perform cleaning
Closed cooling circuit dirty Clean and rinse
Loss of pressure in closed cooling circuit Check that there are no leaks; clean, inspect and check
filler plug
Coolant is non compliant Use recommended coolant (see appendices for technical
characteristics)