Medium Duty Operator's Manual - Peterbilt Motors Company

Engine Cooling System
• The leading edge of any fan blade must be 1 in. (25 mm)
from the inside edge of the shroud.
Exhaust System
The exhaust system is part of the noise control system. Periodically
check the exhaust for wear and loose or missing
parts. For details, see “Noise and Emission Control” on
page 251.
WARNING! The exhaust piping, muffler, converter
muffler or independent converter become
extremely hot during engine operation and can
cause serious burns to the skin. Allow adequate
cooling time before working on or near any part
of the exhaust system.
Preventive Maintenance
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 inhibitors.
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 manufacturers
owner’s manual. It is the owner’s responsibility
to follow all requirements listed in the
engine manufacturers owner’s manual.
Engine Cooling System
– 174 – Y53-6008A Medium Duty (R05/09)