Mitsubishi Fuso CANTER FE85DE6SLGP, Shop Manual

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3. Coolant Replacement and Cleaning of Cooling System
Tightening torque (Unit: N·m {kgf·m})
• Using the radiator for extended periods of time without cleaning can increase chance of rust and scale formation,
which may cause engine overheating. The cooling system must be cleaned periodically.
3.1 Draining of coolant
• Drain the coolant when it is sufficiently cold. Before draining the
coolant, wrap the pressure cap with shop towel and slowly loos-
en the cap to reduce the pressure in the cooling system. Re-
member to drain the coolant in the reservoir tank as well.
WARNING
• If the pressure cap is opened when the coolant is hot, the
hot coolant will gush out and you may get seriously scald-
ed.
3.2 Cleaning procedure
• Keep the coolant temperature at approximately 90
°
C so that the thermostat valve remains open and the coolant
continues to circulate in the radiator.
• For the sake of convenience you can raise the coolant temperature quickly by covering the front of the radiator
with corrugated cardboard or something similar.
• Set the temperature adjusting lever of the heater controller at maximum so that the coolant can circulate freely in
the heater piping area.
• In cases where a great amount of rust has accumulated it often happens that as a result of cleaning the radiator
starts leaking. Conduct a thorough check for leakage after cleaning.
• Soft water to be used should have the following properties.
CAUTION
• Do not use hard water as it causes scale and rust.
Required properties of soft water
Mark Parts to be tightened Tightening torque Remarks
– Radiator drain cock 2.0 {0.2} –
– Water drain plug 25 ± 5 {2.5 ± 0.5} –
Total hardness 300 ppm or less
Sulfate SO 100 ppm or less
Chloride Cl
–
100 ppm or less
Total dissolved solids 500 ppm or less
pH 6 to 8
–
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