Chevrolet Low Cab Forward 2023 Manual page 135

134 Driving and Operating
4. Do not crank the engine for more than
10 seconds at a time. If the engine does
not start, wait 20 to 30 seconds with the
engine control switch in the LOCK or ACC
position before trying to start again.
After the engine has started, check to be
sure the selector lever is still in the "P"
position (models with P-range) or "N"
position (models without P-range).
This engine has an automatic warm-up
system that increases engine idle speed and
applies the exhaust brake. Allow sufficient
time to let the engine circulate lubricant oil
before driving. This usually requires
30 seconds to 2 minutes depending on
ambient conditions.
The turbocharged engine should be started
in a way which ensures the bearings
supporting the rotating parts of the
turbocharger are sufficiently lubricated. Do
not race a cold engine.
At low ambient temperatures, a cold engine
may emit more smoke than usual.
Do not drive the truck until the engine has
had sufficient time to circulate the lubricant
oil. This usually requires 30 seconds to
2 minutes depending on ambient conditions.
This will help reduce white start-up smoke.
Preheating : Diesel engines are compression
ignited, which makes them difficult to start
when they are cold because the compression
alone cannot create a temperature high
enough for fuel to ignite.
Preheating means warming the compressed
air inside the combustion chambers to
facilitate engine starting. Be sure to start
the engine after the wait-to-start light has
gone out.
Start : Do not press the accelerator pedal at
the engine start. The accelerator
opening degree at the engine start is
electronically controlled.
Warm-up : Do not race the engine to speed
warm-up.
Cold Weather Starting
If you plan ahead for cold weather, starting
and driving your vehicle should be no
problem. The following tips will help ensure
good starting in cold weather.
Oil gets thicker as it gets colder, which
slows down the engine cranking speed. For
diesel vehicles, the diesel engine functions
by the heat of compression (and grid heater
when cold), rather than through the use of
spark plugs as in a gasoline engine. So, your
engine must crank faster than a gasoline
engine before it will start.
To be sure the engine can turn fast enough
to start, use SAE 10W-40 viscosity engine oil
when prevailing temperatures drop below
0 °C (32 °F). See the oil quality and oil
viscosity recommendations. Using the proper
viscosity oil will make starting easier down
to -23 °C (-10 °F). When prevailing
temperatures drop below -23 °C (-10 °F), the
optional engine block heater may be needed
for starting.
Maintenance Items to Aid Cold Weather
Starting
Since the basic principle of diesel engine
ignition is based on compression, the diesel
engine is somewhat harder to start than a
gasoline engine when the temperature is
below freezing.
To help prevent hard starting problems,
special attention should be given to
following normal maintenance items:
1. Neglecting to have the fuel filter and
water separator serviced can be one of
the major contributors to hard starting.