© 2020 Pierce Manufacturing Inc. All Rights Reserved. Operating the Engine / 5-37
OPERATION
• Operation of the engine in a high-idle mode will increase the engine heat output somewhat, but is of limited
benefit unless the engine is under load. To provide a load on the engine during long periods of idle time, operate
the pump in the recirculation mode with the engine at 1500 rpm.
Refer to the engine manufacturer’s operator’s manual for further information.
5-17.2 Winter Front Usage
NOTE: Refer to your engine manufacturer’s operation and maintenance manual for information regarding
the use of winter fronts.
Winter fronts are not necessary except in extremely cold temperatures or when light engine loads are combined with
a high rate of engine idling. If a winter front is used, it must be placed over the grill on the outside of the vehicle only,
never directly onto the face of the charge air cooler or radiator. On Pierce Custom Chassis this spacing will maintain
a gap of 6 to 14 inches between the winter front and the heat exchanger cores. This installation will restrict the flow
of air through the cooling system to that which can be drawn from below the bumper and will avoid cutting off cooling
airflow entirely.
5-18. Stopping the Engine
1. Bring the truck to a complete stop using the service brakes.
2. Shift transmission into N (Neutral).
3. Set parking brake.
The use of a winter front increases the need for the operator to carefully monitor engine and
transmission temperatures. Remove the winter front before operating the vehicle in warm
temperatures. Excessive engine and transmission operating temperatures created by the
inappropriate use of a winter front can cause operational failure leading to costly equipment damage.
Detroit Diesel does not recommend winter front usage on GHG16+ engines due to the modern design
of the engine cooling system. Use of a winter front may result in performance issues, DEF system
failures and/or fault codes and other issues. Refer to the Detroit Diesel Operator’s Manual for further
details.
Never stop the engine by turning off the battery switch, or alternator damage may result.
Running the engine at idle allows the lubricating oil and coolant to carry heat away from the
combustion chamber, bearings, shafts, etc. This is especially important with turbocharged engines.
The turbocharger contains bearings and seals that are subject to the high heat of combustion exhaust
gases. While the engine is running, this heat is carried away by normal oil circulation. If the engine is
stopped suddenly, the turbocharger temperature may rise as much as 100°F (56°C). This may result in
seized bearings or loose oil seals. Failure to idle the engine for the proper length of time before
shutdown can lead to reduced engine life or engine component failure.
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