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Engine Idling – In Cold Weather
Avoid prolonged idling in ambient temperatures
below 0°F (-18°C). Long periods of idling may
be harmful to your engine because combustion
chamber temperatures can drop so low that the
fuel may not burn completely. Incomplete com-
bustion allows carbon and varnish to form on
piston rings and injector nozzles. Also, the
unburned fuel can enter the crankcase, diluting
the oil and causing rapid wear to the engine.
Stopping the Engine
The following chart should be used as a guide in
determining the amount of engine idle time
required to sufficiently cool down the turbo-
charger before shut down, depending upon the
type of driving and the amount of cargo.
Before turning off your turbo diesel engine,
always allow the engine to return to normal
idle speed and run for several seconds. This
assures proper lubrication of the turbo-
charger. This is particularly necessary after
any period of hard driving.
Idle the engine a few minutes before routine
shutdown. After full load operation, idle the
engine three to five minutes before shutting it
down. This idle period will allow the lubricating
oil and coolant to carry excess heat away from
the combustion chamber, bearings, internal
components, and turbocharger. This is espe-
cially important for turbocharged, charge air
cooled engines.
TURBOCHARGER
"
COOL DOWN
"
CHART
Driving
Conditions
Load
Turbocharger
Temperature
Idle Time (In Minutes)
Before Shut Down
Stop & Go
Empty
Cool
Less than 1
Stop & Go
Medium
Warm
1
Highway Speeds
Medium
Warm
2
City Traffic
Max. GCWR
Warm
3
Highway Speeds
Max. GCWR
Warm
4
Uphill Grade
Max. GCWR
Hot
5
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