Paccar PX-9 Operator's Manual - page 43
OPERATING INSTRUCTIONS
bearings and gives ample time to allow
the oil pressure to stabilize.
If an engine must idle for an extended
period of time, it should be done at
a fast idle (1,000 RPM maximum) at
coolant temperatures below 150°F
(70°C).
For coolant temperatures below 150°F
(70°C), use a low gear and drive
at moderate engine speed until the
engine coolant has reached operating
temperature. DO NOT let the engine
idle longer than necessary.
CAUTION
DO NOT operate the engine at low
idle for long periods with engine
coolant temperature below the
minimum specification in “Cooling
System” on page 5-15. This can
result in the following:
•
Fuel dilution of the lubricating
oil
•
Carbon buildup in the
combustion chamber
•
Sticking of the valves in the
cylinder head
•
Reduced performance
•
Damage to aftertreatment
components
NOTE
For engines equipped with the
engine warm-up protection fea-
ture;
this feature limits engine
speed and torque following engine
start-up until sufficient oil pressure
is available to the engine compo-
nents.
This feature reduces the
risk of engine part damage due
to operating at engine speeds too
high or loads before adequate oil
pressure is achieved.
Some engines are equipped with a
“Fast-Idle Warm-Up” feature. When
enabled, this feature elevates the idle
speed of the engine in cold ambient
conditions, in order to shorten the time
necessary to warm up the engine.
When the idle speed is elevated, the
engine noise may change, this is
normal. To bring the engine back to
low idle speed:
(12/2014)
Y53-1185-1B1
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