Peterbilt 387 - Engine Cooling System

PART 8: MAINTENANCE AND SERVICE ENGINE COOLING SYSTEM
(R10/06) Y53-6007 – 171 –
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%.
Desired ELC/
Water ratio:
0% 10% 15% 20% 25% 30% 35% 40% 45% 50% 55% 60% 65% 70% 75% 80% 85% 90% 100%
Freeze point
°F (°C)
+32
(0)
+25
(-4)
+20
(-7)
+15
(-9)
+10
(-12)
+5
(-15)
-5
(-21)
-12
(-24)
-23
(-31)
-34
(-37)
-50
(-46)
-65
(-54)
-75
(-59)
-84
(-64)
-70
(-57)
-55
(-48)
-43
(-42)
-30
(-34)
-5
(-21)