70
Group 26 Cooling system
Checking the coolant level
WARNING! Do not open the filler cap when the
engine is hot, except in emergencies. Steam or
hot fluid may spray out.
Turn the filler cap to the first stop and allow any ex-
cess pressure to hiss out before removing the cap
completely. Top the coolant up as necessary. The
level should be between the filler opening and the low-
er edge of the level marker (1). Fit the filler cap.
If a separate expansion tank is fitted (extra equip-
ment), the coolant level shall be between the MIN and
MAX marks.
Coolant temperature too low
Low coolant temperature can be caused by:
• Faulty thermostat.
• Faulty temperature sensor or instrument.
• Engine running with low load.
Coolant temperature too high
High coolant temperature (warning lamp lights up) can
be caused by:
• Blocked sea water inlet or sea water filter
• Defective impeller in the sea water pump.
• Coolant level Too low, air in the fresh water sys-
tem.
• Slipping or broken drive belt for circulation pump.
• Faulty thermostat, temperature sensor or instru-
ment.
• Blocked cooling system.
• Incorrectly set injection timing on the injection
pump.
• Filler cap gasket does not seal.
1
MAX
MIN
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