NOISE
Diesel engines can create noises that may seem as a
concern. The nature of a diesel engine is compression
ignition where compressed air and fuel are mixed and
ignited. Weather, barometric pressure, altitude and
temperature will affect how fuel is ignited in the engine.
Engines will sound different from day to day or previous
model years. Clicking, ticking, or light knocking is nor-
mal and will change from day to day, as the engine
breaks in, and can vary with changes in ambient tem-
perature; this is normal. Diesel equipped vehicles also
have an exhaust after treatment system to reduce
emissions utilizing a Diesel Particulate Filter (DPF) and
a Selective Reduction Catalyst (SCR). The SCR reduces
Nox using the Diesel Exhaust Fluid (DEF) system. DEF is
injected directly into the SCR through an dosing mod-
ule. This process will create a clicking sound and at
times, will make noise even with the vehicle shut off.
This is normal as the DEF dosing module is purging
DEF. If at any time the check engine light is on, please
visit an authorized dealer.
STOPPING THE ENGINE
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. Refer to the following chart for proper engine
shutdown:
Driving Condition Load Turbocharger Temperature
Idle Time (min.) Before Engine Shut-
down
Stop and Go Empty Cool Less than One
Stop and Go Medium - One
Highway Speeds Medium Warm Two
City Traffic Maximum GCWR - Three
Highway Speeds Maximum GCWR - Four
Uphill Grade Maximum GCWR Hot Five
106 STARTING AND OPERATING
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