Mitsubishi S12R Service Manual

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

Mitsubishi S12R Specifications

General

Engine Model	S12R
Fuel Type	Diesel
Starting System	Electric starter
Aspiration	Turbocharged
Lubrication System	Forced lubrication
Cooling System	Water-cooled