SECTION IX FAULT DIAGNOSIS
Dark smoke from exhaust
–
Check that the air filter element is clean:
•
Clean or replace as necessary. Check the efficiency of the injec-
tors and calibrate if necessary. Check the calibration of the elec-
tronic rpm control (operation to be carried out by a specialised
service centre).
Engine does not respond well to sudden acceleration
–
Inspect the air filter element:
•
Clean or replace as necessary.
–
Inspect the fuel filter:
•
Replace if necessary and bleed air from the system if necessary.
–
Poor compression:
•
Check valve clearances are (0.2 mm/0.008 in - for engine with air
cooling system - 0.3 mm/0.012 in - for engine with water cooling
system) in (operation to be carried out by a specialised service
centre); grind or replace valves as necessary. If the problem per-
sists, check piston rings and cylinder liners for wear and replace if
necesssary.
The engine does not run at a constant speed
–
Check for water in the fuel system:
•
Drain the fuel tanks and refill with clean fuel.
•
Check the calibration of the injectors (operation to be carried out
by a specialised service centre).
Engine overheats
–
Check drivebelt tensions:
•
Adjust drivebelt tensions. Clean air intake grilles.
–
Check the injection pump timing (operation to be carried out by a spe-
cialised service centre):
•
Calibrate the pumps and, if necessary, the injectors.
•
Check the pressure in the turbocharger outlet; clean the the
turbocharger.
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