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Service Manual Mitsubishi SL-Series diesel engines
Version 08/2004
TROUBLESHOOTING
ENGLISH
OVERHAUL INSTRUCTIONS
6.2.3 Problem 3: Overheating
Overheating might also be caused by abnormal
operating conditions. If the engine is overheating but its
cooling system is not contributing to this trouble, it is
necessary to check the difference between the ambient
temperature and coolant temperature when the engine
is in normal operation (with the thermostat fully open).
If the ambient temperature is higher than the normal
coolant temperature by more than 60°C (108°C),
investigate other items than those related to the engine
cooling system.
1. Items to be checked ahead of time
• Insufficient coolant and exterior coolant leaks
• Loose fan belt
• Radiator core openings plugged with dirt
2. Inspection procedure
Are cooling system components (water pump, water hoses, radiator,
thermostat and cylinder head gasket) normal?
No Z Check the components.
VYes
Is injection timing correct? No Z
Make adjustment to the
timing.
V Yes
Are lubrication system components (oil filter, oil pump and oil screen)
normal and oil level correct?
No Z
Check the components and
oil level.
V Yes
Is governor adjustment correct? No Z
Make adjustment to the
governor.
V Yes
Engine is in continuous full-
load operation.
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