MAINTENANCE MANUAL OF ENGINE
12
3. Engine coolant
Use as cooling water the clean soft water,
such as river water, rain water, snow water and
tap water. Soft water contains fewer minerals.
It generates little foul after heated. Less possi-
bility exists that soft water causes blockage in
the cooling system thus affects heat dissipa-
tion. If soft water is unavailable hence hard
water has to be used, for example, well water,
spring water or other hard water containing
many minerals, softening of the water shall be
performed. The simplest softening method is
to boil the water, wait for a period for deposi-
tion of minerals, and then remove the miner-
als.
If the diesel engine is used in a cold region,
depending on the ambient temperature, add
proper amount of anti-freeze into the cooling
water. The anti-freeze can be the mixture of
alcohol and glycerol or ethanediol.
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