Specifications

esourcebook.dealerconnection.com
RE&T: 2011 Source Book
on this page
Revised January 2011
F-250/F-350/F-450
SD Pickups
20
F-250/F-350/F-450
Super Duty
®
Pickups
Performance/Handling
— Diesel Exhaust Fluid (DEF)
2011
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