Paccar Peterbilt 320, Operator'S Manual

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PART 7: STARTING & OPERATING THE VEHICLE Final Stop
liners, turbocharger, and bearings. This way you can pre-
vent serious engine damage that may result from uneven
cooling.
Turbochargers
This cooling-down practice is especially important on a tur-
bocharged engine. The turbocharger contains bearings
and seals that are subjected to hot exhaust gases. While
the engine is operating, heat is carried away by circulat-
ing oil. If you stop the engine suddenly after a hard run,
the temperature of the turbocharger could rise as much as
100°F (55°C) above the temperature reached during oper-
ation. A sudden rise in temperature like this could cause
the bearings to seize or the oil seals to loosen.
Refuel Before the Final Stop
Air space in your fuel tanks allows water to condense there.
To prevent this condensation while you are stopped,
fi ll your
tanks to 95% of capacity.
Final Stop
To make sure your vehicle is ready to go after a long stop
(such as over night), please follow the suggestions below.
Your vehicle will be easier to get going when you are ready,
and it will be safer for anyone who might be around it.
Please remember, too, that in some states it is illegal to
leave the engine running and the vehicle unattended.
Final Stopping Procedures
1. Set the parking brake before leaving the driver’s seat.
To hold your vehicle while it is parked, don’t rely on
• Air Brakes
• Hand Control Valve for Trailer Brakes
• Engine Compression
WARNING! Using the trailer hand brake or air
brakes to hold a parked vehicle is dangerous.
Because they work with air pressure, these
brakes could come loose. Your vehicle could
roll, causing a serious accident. Someone
could be hurt or killed. Always set the parking
brakes. Never rely on the trailer hand brake or
truck air brakes to hold a parked vehicle.
2. If you are parked on a steep grade, block the wheels.
R(08/07) Y53-6015 – 99 –