Continuous operation with engine coolant
temperature above or below the engine
coolant temperature specifications listed in
“Engine Coolant Specifications on page
48” can damage the engine.
Engine Operating Range
Proper Engine Operating Range
1. Full throttle rpm
2. Peak torque
CAUTION
Operating the engine at full throttle be-
low peak torque will shorten engine life
to overhaul, can cause serious engine
damage, and is considered engine
abuse. DO NOT operate the engine at
full throttle operation below peak tor-
que rpm for more than 30 seconds.
Failure to comply may result in equip-
ment or property damage.
PACCAR engines are designed to operate
at full throttle under momentary conditions
down to peak torque engine speed. This is
consistent with recommended operating
practices.
CAUTION
Operating the engine beyond the max-
imum engine speed can cause severe
engine damage. Use proper operating
techniques for the vehicle to prevent
engine overspeed. See Engine Speci-
fications for maximum engine speed.
Failure to comply may result in equip-
ment or property damage.
ENGINE OPERATION - Operating Instructions
Y53-1183-1G1 (05/19) 23
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