operators_manual

NOTE
Failure to return the bypass to the
RUN position will
prevent fuel recircu-
lation and heating.
WARNING
DO NOT loosen any fuel line fittings in
order
to
bleed
the fuel system of air.
The system is under high pressure
which, when relieved, could cause
death, personal injury, equipment or
property damage.
Cooling System
Important information on replacing coolant
filters.
Your engine may be equipped with a
coolant filter designed to capture and
remove harmful deposits from the cooling
system to help prolong system life. Refer to
the Preventative Maintenance Schedule for
the recommended coolant filter change
service interval.
WARNING
Do not remove the surge tank fill cap
on a hot
engine. It can cause scalding
coolant to spray out and you could be
burned. If the engine has been operat-
ed within the last 30 minutes, be very
careful in removing the radiator cap.
Protect face, hands, and arms against
escaping fluid and steam by covering
the cap with a large, thick rag. Failure
to comply may result in death, person-
al injury, equipment or property dam-
age
WARNING
Handle coolant and antifreeze careful-
ly. Ethylene
glycol antifreeze is poison-
ous. Store in original fluid container
only, and always keep out of the reach
of children. Never remove the filler cap
(vertically mounted) on the surge tank
while the engine is still hot. Wait until
the coolant temperature is below
120°F (50°C). Scalding steam and flu-
id under pressure may escape and
cause serious personal injuries. The
pressure cap (horizontally mounted)
on the surge
tank should never be
opened. Failure to comply may result
in death, personal injury, equipment or
property damage.
Coolant/Antifreeze Condition
Maintenance checks for ensuring proper
coolant\anti-freeze condition.
Perform these maintenance procedures
according to the Preventative Maintenance
Schedule.
NOTE
Test the engine coolant at least twice
per year to
determine if the coolant
must be replaced. If it is determined
that the coolant should be replaced,
make sure to flush the coolant system.
Contact a PACCAR authorized repair
location for flushing the coolant sys-
tem.
1. Check the following anti-freeze
conditions:
• Freeze point
• Coolant level
ENGINE MAINTENANCE
- Maintenance Procedures
Y53-1181-1K1 (08/2018) 63
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