Paccar PX 8 Operator's Manual - page 30
Operating Instructions
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Y53-1030A 12/09
PACCAR
• Loss of power.
• An increase in oil consumption.
• An increase in fuel consumption.
• Fuel, oil, or coolant leaks.
CAUTION: Do not allow your engine to idle, at
low rpm's (400-600 rpm), longer than five min-
utes. Long periods of idling after the engine has
reached operating temperatures can decrease
engine temperature and cause gummed piston
rings, clogged injectors, and possible engine
damage from lack of lubrication. The normal tor-
sional vibrations generated by the engine can
also cause transmission wear. If an engine must
idle for an extended period of time, it should be
done at fast idle (1,000 rpm or greater).
NOTE:
An idle shutdown feature, available on
PACCAR Engines, can be programmed to shut the
engine down after a period of low idle speed operation
with no driver activity. A flashing warning lamp will
inform the driver of an impending shutdown.
NOTE:
The power take off (PTO) feature, available on
PACCAR engines, can be programmed to adjust
engine idle speed with the use of switches to pre-pro-
grammed set points.
Cold Weather
I t i s p o s s i bl e t o o p e ra t e e n g i n e s i n ex t r e m e l y c o l d
environments if they are properly prepared and maintained.
Satisfactory performance of an engine in low ambient
temperature conditions requires modification of the engine,
s u r r o u n d i n g e q u i p m e n t , o p e r a t i n g p r a c t i c e s a n d
maintenance procedures.
The correct engine coolant lubricating oil and fuels must be
used for the cold weather range in which the engine is being
operated. Below are the recommendations for these critical
engine fluids.
Coolant Recommentations and
Specifications
The cooling system in your vehicle was factory filled with
Extended Life Coolant (ELC) that meets or exceeds all
ASTM D 6210 requirements. PACCAR recommends only
using a 50/50 mixture of distilled water and ELC when
cooling system service is required. A 50/50 mixture of ELC
and distilled water will provide freeze protection down to -
34°F (- 36.7°C), which is adequate for most locations in
North America. For extremely cold operating conditions, a
60/40 mixture (coolant/water ratio) can be used to provide
freeze protection down to -62°F (-52.2°C).