Paccar PX-7, Руководство оператора

Страница: 24 / 92

Cold Weather Starting
Allow the Wait-to-Start warning lamp to
turn off. Engine Wait-To-Start Lamp on
page 16
Follow this engine starting procedure when
the outside temperature is below 50°F
(10°C).
CAUTION
To reduce the possibility of damage to
the lubricating oil pan, due to the ma-
terials used in the manufacture of the
lubricating oil pan, under no circum-
stances should an external heat
source be applied directly or indirectly
to the lubricating oil pan.
1. Follow the Normal Starting
Procedure on page 21.
Refer to the vehicle operator's manual
instructions for any additional cold weather
starting procedures.
2. If starting a cold engine, slowly
increase the engine speed. This
provides adequate lubrication to
the bearings and gives ample time
to allow the oil pressure to
stabilize.
CAUTION
The use of starting aids, such as ether,
may result in damage to the engine
and engine aftertreatment system.
3. 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. If the vehicle cannot be
driven, an elevated idle speed may
be used instead to warm the
engine.
CAUTION
DO NOT operate the engine at low idle
for long periods of time when the cool-
ant temperature is below the normal
operating range. This could result in
the following:
• Fuel dilution of the lubricating
oil
• Carbon buildup in the com-
bustion chamber
• Sticking of the valves in the
cylinder head
• Reduced performance
• Damage to aftertreatment
components
Starting Procedure After Extended
Shutdown or Oil Change
After extended shutdown or an oil change
follow the
Normal Starting Procedure on
page 21.
The engine will run at idle only until the
minimum oil pressure is detected by the
ECM. It can take more cranking time to
start the engine after an extended shut
down or oil change.
Operating the Engine
Monitor the oil pressure and coolant
temperature gauges frequently. Refer to
Engine Oil Capacities and Pressures on
page 42 and Engine Coolant
Specifications on page 48 for
recommended operating pressures and
temperatures. Shut off the engine if any
pressure or temperature does NOT meet
the specifications.
ENGINE OPERATION - Operating Instructions
22 Y53-1183-1G1 (05/19)
1