Specifications

F-250/F-350/F-450
SD Pickups
18
June 2011
esourcebook.dealerconnection.com
RE&T: 2012 Source Book
F-250/F-350/F-450
Super Duty Pickups
Performance/Handling
2012
Diesel Engine Emissions cont’d
ENGINEERING INSIGHT
Diesel Exhaust Fluid (DEF)
Storage of DEF
• DEFisover60percent
water, which means
the fluid is temperature
sensitive
• DEFhasafreezingpointof
12 degrees F (-11 degrees C)
and should not be stored at
or below this temperature
• StoringDEFat
temperatures higher than
86 degrees F (30 degrees
C) can reduce shelf life
• TheureainDEFstarts
to decompose (breaks
down) into ammonia at
temperatures above
122 degrees F (50 degrees
C), so care should be
taken using DEF in hot
environments
Operational Characteristics
of DEF
• DEFexpandswhenit
freezes;however,DEF
tanks and packaging are
designed to allow for
expansion of the fluid
• TheSCRsystemallows
the vehicle to start without
ureaflowing(DEFfrozen)
• Afterthevehicleisstarted,
the heated reservoir,
supply module and supply
line will cause the fluid
to thaw and resume flow
through the system
DEF Maintenance
• DEFmustbereplenishedinordertomaintain
operation of the vehicle
• FailuretorefilltheDEFtankwillresult
in reduced engine speeds as the tank
approaches empty and eventually forced
engine idle when the tank is depleted
• Thesystemincludesanumberofaudible
warnings and cluster messages beginning at
approximately 800 miles before the tank is
empty to notify the driver of the current DEF
tank status
• Undernormaloperation,theDEFshould
only require filling concurrent with the
recommended oil change intervals
• DEFrefillmayberequiredbytheoperator
under some conditions, depending on duty
cycle and operator behavior
– Motorcraft
®
DEF is widely available in 1- and
2.5-gallon bottles for customer use
– Ford recommends using only API-certified DEF
Diesel Exhaust Fluid (DEF)
• Asolutioncomprisedof32.5percenthigh-purityurea
and67.5percentdemineralizedwater
• Theureainthesolutionbreaksdownintoammonia
when injected into the exhaust stream
• DEFisclear,nontoxicandsafetohandle
• Storedina5-gallonreservoirtanklocatednearthe
fuel tank
– DEF tank, supply module and supply line are
heatedtohelppreventthefreezingofDEFand
keep it in a liquid state
– DEF tank includes temperature and fluid level sensors
• DEFtankfillislocatednexttothedieselfuelfiller
• DEFiswidelyavailablein1-and2.5-gallonbottles