Northern Lights M673L3, Руководство оператора

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OM673L3 5/21
19
Servicing
COOLING SYSTEM - GENERAL
NOTE: Be sure to close the sea-cock before
working on the engine cooling system.
CAUTION: The cooling water in the engine reaches
extremely high temperatures. You must use extreme
caution when working on hot engines to avoid
burns. Allow the engine to cool before working on
the cooling system. Do not open the filler cap when
the engine is warm.
WATER QUALITY
1. Distilled, soft water is preferred for use in cooling
systems. Bottled distilled water from a food store or
water supplier is recommended. Tap water often has
a high mineral content. Tap water should NEVER
be put in a cooling system unless first tested by a
water quality laboratory. Do not use water made by
the reverse osmosis method unless it has been PH
neutralized.
2. Acceptable water quality specifications are shown
below:
SP-10. CHECKING COOLANT LEVEL
1. Check the coolant level each day before starting the
engine. Check the water level by removing the pressure
cap from the expansion tank.
In order to give the cooling water an opportunity to
expand, the level should be about 1 in. (2.5 cm) below
the filler cap sealing surface when the engine is cold.
2. The pressure valve in the filler cap releases when the
pressure is approximately 7 PSI (0.5 bar). Use a cap
pressure tester to check cap if you suspect it is faulty.
SP-11. COOLING SYSTEM FLUSHING
1. Flush the cooling system every 2500 hours or every
24 months, whichever comes first.
a. Remove expansion tank cap and drain engine
block.
b. Leave all drains open.
c. Pour clean water into expansion tank until
water coming from drains is free of
discoloration and sediment.
d. Let water drain completely.
e. Close drains and refill with recommended
mixture.
NOTE: Open sea-cock before running engine.
2. Coolant Specifications:
Use 50% water / 50% ethylene glycol antifreeze mix.
Antifreeze mixture is recommended as a good year-
round coolant, but not methyl alcohol based antifreeze
because of its low boiling point. Also, antifreeze with
high silicate should not be used.
3. Check hoses and connections and repair any leakage.
Parts Grains
Contaminates per Million per Gallon
Maximum Chlorides 40 2.5
Maximum Sulfates 100 5.9
Maximum Dissolved Solids 340 20.0
Maximum Total Hardness 170 10.0
PH Level 5.5 to 9.0
Updated 8-7-19