Paccar PX-9 - Page 43

OPERATINGINSTRUCTIONS
bearingsandgivesampletimetoallow
theoilpressuretostabilize.
Ifanenginemustidleforanextended
periodoftime,itshouldbedoneat
afastidle(1,000RPMmaximum)at
coolanttemperaturesbelow150°F
(70°C).
Forcoolanttemperaturesbelow150°F
(70°C),usealowgearanddrive
atmoderateenginespeeduntilthe
enginecoolanthasreachedoperating
temperature.DONOTlettheengine
idlelongerthannecessary.
CAUTION
DONOToperatetheengineatlow
idleforlongperiodswithengine
coolanttemperaturebelowthe
minimumspecicationin“Cooling
System”onpage5-15.Thiscan
resultinthefollowing:
•Fueldilutionofthelubricating
oil
•Carbonbuildupinthe
combustionchamber
•Stickingofthevalvesinthe
cylinderhead
•Reducedperformance
•Damagetoaftertreatment
components
NOTE
Forenginesequippedwiththe
enginewarm-upprotectionfea-
ture;thisfeaturelimitsengine
speedandtorquefollowingengine
start-upuntilsufcientoilpressure
isavailabletotheenginecompo-
nents.Thisfeaturereducesthe
riskofenginepartdamagedue
tooperatingatenginespeedstoo
highorloadsbeforeadequateoil
pressureisachieved.
Someenginesareequippedwitha
“Fast-IdleWarm-Up”feature.When
enabled,thisfeatureelevatestheidle
speedoftheengineincoldambient
conditions,inordertoshortenthetime
necessarytowarmuptheengine.
Whentheidlespeediselevated,the
enginenoisemaychange,thisis
normal.Tobringtheenginebackto
lowidlespeed:
(12/2014)Y53-1185-1B14-
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