140 OPERATION MACK ENGINE INFORMATION For engine starting procedures, refer to “STARTING THE VEHICLE”, page 162.
Precautions and Warnings
CAUTION If a winterfront is needed, use only a winterfront that was designed for this specific chassis. Winterfronts are not recommended, but may be used during very cold weather with sustained temperatures below -25°C (-13°F).
CAUTION Be sure to avoid high intake/exhaust temperatures when using winterfronts under normal operating conditions (above freezing). The restriction of airflow can cause higher exhaust temperatures, power loss, excessive fan usage and reduced fuel economy.
CAUTION If a winterfront is used, a MACK-approved exhaust pyrometer must be installed and closely monitored while the engine is in operation. Do NOT exceed the maximum temperature indicated by the red line on the gauge. To reduce exhaust temperature, downshift or reduce engine power and open the winterfront.
CAUTION Do not permit a heavy load to drive the engine above the governed speed. Operate in a gear low enough to allow the engine to accelerate to (or maintain) governed speed when applying the throttle.
