PART 8: MAINTENANCE AND SERVICE
ENGINE COOLING SYSTEM
(R05/10)
Y53-6032
– 191 –
of small amounts of moisture is normal and should not
be considered as an indication that the dryer is not
performing properly.
• An outside air source may have been used to charge
the air system, in which case this air did not pass
through the drying bed.
Engine Cooling System
Your engine’s cooling system is standard with Extended
Life Coolant (ELC). ELC consists of a mixture of ethylene
glycol, water, and organic acid technology chemical inhib-
itors. ELC prevents corrosion and scale formation as well
as provides freezing and boiling point protection.
CAUTION: The engine cooling system has
very specific maintenance and inspection
requirements. Failure to follow requirements
can damage the engine. Engine damage can
include but is not limited to:
•Freezing
•Boiling
•Corrosion
•Pitted cylinder liners
This information is found in the engine manufac-
turers owner’s manual. It is the owner’s respon-
sibility to follow all requirements listed in the
engine manufacturers owner’s manual.
What To Check In An ELC-filled Cooling System
ELC Concentration
Check the level of freeze/boilover protection, which is
determined by the ELC concentration. Use a glycol refrac-
tometer to determine glycol level. Add ELC to obtain the
ELC to water ratio required to provide the protection you
need. Use the chart below to help determine how much
ELC you need to add. In an ELC-filled cooling system, the
freeze point should be maintained between -30° F and -
45° F (-34° C and -43° C)
NOTE: Maximum recommended ELC concentra-
tion is 60% ELC and 40% water by volume (a 60/
40 coolant mixture). The minimum recommended
concentration is 40%.
Y53-6032.book Page 191 Monday, May 24, 2010 3:37 PM
Summary of Contents for Peterbilt 587
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