VII. SERVICE AND MAINTENANCE FLUIDS CONTINUED
Cooling System COOLANT TYPE - Your cooling system should always be sufficiently charged with an adequate mixture of antifreeze and water, regardless of the climate, in order to maintain a broad operating temperature range. Your cooling system has been factory-charged with an ethylene glycol-based antifreeze.
NOTE: Ethylene glycol-based antifreeze and propylene glycol -based antifreeze should never be mixed.
FIG 7.6
CHECKING CONCENTRATION - The radiator cap is located immediately behind the rear of the operator’s station (fig. 7.6). Never remove a cap from a hot engine. Always allow the engine to cool before servicing cooling system. A 50/50 antifreeze/water mixture is a conservative mixture which allows good protection against both overheating and freezing. The table in figure 7.8 gives a few examples of ethylene glycol antifreeze/water mixture protection values. Concentration should be checked every 500 hours or at the beginning of each winter, whichever comes first. It should be
FIG 7.7
checked using a refractometer; “floating ball”-type density testers or hydrometers are not accurate enough for use with
Ethylene Glycol
heavy duty diesel cooling systems. CHECKING FLUID LEVEL - The coolant level should be
40%
-23ºC
-10ºF
checked daily while the engine is cold. This should be done at the same time that the overflow is checked. If you do not see
50%
-37ºC
-34ºF
fluid in the neck of the radiator then fluid must be added. Be sure that if you are adding anti-freeze that it is ethylene glycol-
60%
-54ºC
-65ºF
based. DO NOT mix with propylene glycol-based antifreeze.
FIG 7.8
84 SERVICE AND MAINTENANCE CONTINUED
