Mitsubishi S12R - Excessive Fuel Consumption

11 TROUBLESHOOTING
Mitsubishi Diesel Engine S12R OPERATION & MAINTENANCE MANUAL
187
Pub. No. 291Y1-40720 Revision: 5
Excessive Fuel Consumption
Table 11-8 Excessive Fuel Consumption
Problem Cause Remedies Reference
Page
Excessive Fuel
Consumption
Fuel System Fuel injection noz-
zle malfunction
• Contact your MHIET dealer. 10
Faulty fuel injection
timing
• Check fuel injection pump drive
coupling.
-
• Contact your MHIET dealer. 10
Improper fuel prop-
erties
• Change with appropriate fuel. 103
Fuel leaks from low
pressure fuel line
• Check defects of low pressure fuel
line and retighten, if necessary.
144
Fuel leaks from
high pressure fuel
injection pipe
• Check defects of high pressure
fuel injection pipe
144
• Contact your MHIET dealer. 10
Cooling System Overcooling • Check fan and heat exchanger.
• Check control system.
• Thermostat - Check
-
• Contact your MHIET dealer. 10
Intake and
Exhaust
Systems
Insufficient amount
of intake air
• Turbocharger - Check 165
• Clean, check and replace pre-
cleaner.
166
• Clean, check and replace air
cleaner element.
• Check intake air pressure and
leakage of intake air.
• Check intake air temperature and
ventilation system.
167
• Contact your MHIET dealer. 10
Increase of exhaust
resistance
• Turbocharger - Check 165
• Check exhaust pipes, muffler and
silencer.
165
• Contact your MHIET dealer. 10
Engine Body Compression pres-
sure drop
• Contact your MHIET dealer. 10
Faulty valve timing
Wear of sliding
parts