VII.
SERVICE AND MAINTENANCE
B. FLUIDS
87
COOLING SYSTEM
COOLANT TYPE–
Your cooling system should always be suffi-
ciently charged with an adequate mixture of antifreeze and water, regard-
less of the climate, in order to maintain a broad operating temperature
range. Your cooling system has been factory charged with Extended Life
formulations that contain ethylene-glycol based fluids and are designed
specifically for Extended Service use heavy-duty diesel engines.
CHECKING CONCENTRATION–
The radiator cap is located on
the right side of the engine compartment on the surge tank (fig. 87-1).
Never remove the cap from a hot engine. Always allow the engine to cool
before servicing the cooling system.
A 50/50 antifreeze/water mixture is a conservative mixture which al-
lows good protection against both overheating and freezing. If a stronger
antifreeze mixture is required, be sure not to exceed the engine manufac-
turer’s guidelines for antifreeze mixing. The table in figure 87-2 gives a few
examples of ES COMPLEAT ethylene-glycol antifreeze/water mixture pro-
tection values. Consult the engine manufacturer’s handbook for further
information.
Concentration should be checked every 500 hours or at the beginning
of each winter, whichever comes first. A refractometer should be used to
check concentration, “floating ball” type density testers are not accurate
enough for use with heavy duty diesel cooling systems.
CHANGING COOLANT–
Your coolant should periodically be
changed to eliminate the buildup of harmful chemicals. Drain and replace the coolant every other spraying
season or 1,000 hours of service, whichever comes first. Refill only with soft water because hard water con-
tains minerals which break down the anti-corrosion properties of antifreeze.
SERVICE AND MAINTENANCE
FIG 87-2
50%
-37ºC -34ºF
60%
-54ºC -65ºF
ES COMPLEAT
FIG 87-1
NOTE:
Only Cummins Fleetguard anti-
freeze is to be used in this ma-
chine.
Summary of Contents for UpFront STS 16
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