Operation and maintenance manual

Engine Operating Range QSB4.5 and QSB6.7
Page 1-6 Section 1 - Operating Instructions
Winterfronts and Shutters
Winterfronts and shutters can be used on a vehicle or
equipment to reduce air flow through the radiator core into
the engine compartment. This can reduce the time
required to warm the engine and help maintain the engine
coolant temperature. The engine coolant temperature
specifications are in the Maintenance Specification
(Section V).
Engine Operating Range
General Information
CAUTION
Do not operate the engine at full throttle below peak
torque rpm (refer to engine dataplate for peak torque
rpm) for more than 30 seconds. Operating the engine
at full throttle below peak torque will shorten engine
life to overhaul, can cause serious engine damage,
and is considered engine abuse.
Cummins® engines are designed to operate successfully
at full throttle under transient conditions down to peak
torque engine speed. This is consistent with
recommended operating practices.
CAUTION
Do not operate the engine beyond the maximum
engine speed. Operating the engine beyond the
maximum engine speed can cause severe engine
damage. Use proper operating techniques for the
vehicle, vessel, or equipment to prevent engine
overspeed. The maximum engine speed specification
is listed in Maintenance Specifications (Section V).
CAUTION
Do not idle the engine for excessively long periods.
Long periods of idling, more than 10 minutes, can
cause poor engine performance.