DIESEL EXHAUST FLUID
Diesel Exhaust Fluid (DEF) sometimes known simply by the name of its active
component, UREA – is a key component of selective catalytic reduction (SCR)
systems, which help diesel vehicles meet stringent emission regulations. DEF is a
liquid reducing agent that reacts with engine exhaust in the presence of a catalyst to
convert smog-forming nitrogen oxides (NOx) into harmless nitrogen and water vapor.
Your vehicle is equipped with a Selective Catalytic Reduction system in order to meet
the very stringent diesel emissions standards required by the Environmental Protec-
tion Agency. Selective Catalytic Reduction (SCR) is the first and only technology in
decades to be as good for the environment as it is good for business and vehicle
performance.
The purpose of the SCR system is to reduce levels of NOx (oxides of nitrogen emitted
from engines) that are harmful to our health and the environment to an almost near-zero
level. Small quantities of Diesel Exhaust Fluid (DEF) are injected into the exhaust
upstream of a catalyst where, when vaporized, convert smog-forming nitrogen oxides
(NOx) into harmless nitrogen (N2) and water vapor (H2O), two natural components of
the air we breathe. You can operate with the comfort that your vehicle is contributing to
a cleaner, healthier world environment for this and generations to come.
System Overview
This vehicle is equipped with a Diesel Exhaust Fluid (DEF) injection system and a
Selective Catalytic Reduction (SCR) catalyst to meet the emission requirements.
The DEF injection system consists of the following components:
• DEF tank
• DEF pump
• DEF injector
• Electronically-heated DEF lines
• NOx sensors
• Temperature sensors
• SCR catalyst
The DEF injection system and SCR catalyst enable the achievement of diesel emissions
requirements; while maintaining outstanding fuel economy, drivability, torque and
power ratings.
NOTE:
• Your vehicle is equipped with a DEF injection system. You may occasionally hearan audible clicking noise. This is normal operation.
• The DEF pump will run for a period of time after engine shutdown to purge the DEF system. This is normal operation.
1500 3.0L DIESEL
151
DIESEL EXHAUST FLUID
Diesel Exhaust Fluid (DEF) sometimes known simply by the name of its active
component, UREA – is a key component of selective catalytic reduction (SCR)
systems, which help diesel vehicles meet stringent emission regulations. DEF is a
liquid reducing agent that reacts with engine exhaust in the presence of a catalyst to
convert smog-forming nitrogen oxides (NOx) into harmless nitrogen and water vapor.
Your vehicle is equipped with a Selective Catalytic Reduction system in order to meet
the very stringent diesel emissions standards required by the Environmental Protec-
tion Agency. Selective Catalytic Reduction (SCR) is the first and only technology in
decades to be as good for the environment as it is good for business and vehicle
performance.
The purpose of the SCR system is to reduce levels of NOx (oxides of nitrogen emitted
from engines) that are harmful to our health and the environment to an almost near-zero
level. Small quantities of Diesel Exhaust Fluid (DEF) are injected into the exhaust
upstream of a catalyst where, when vaporized, convert smog-forming nitrogen oxides
(NOx) into harmless nitrogen (N2) and water vapor (H2O), two natural components of
the air we breathe. You can operate with the comfort that your vehicle is contributing to
a cleaner, healthier world environment for this and generations to come.
System Overview
This vehicle is equipped with a Diesel Exhaust Fluid (DEF) injection system and a
Selective Catalytic Reduction (SCR) catalyst to meet the emission requirements.
The DEF injection system consists of the following components:
• DEF tank
• DEF pump
• DEF injector
• Electronically-heated DEF lines
• DEF control module
• NOx sensors
• NH3 sensor
• Temperature sensors
• SCR catalyst
The DEF injection system and SCR catalyst enable the achievement of diesel
emissions requirements; while maintaining outstanding fuel economy, drivability,
torque and power ratings.
6.7L CUMMINS® DIESEL
164
•For 4x2 and 4x4 trucks, when changing a rear wheel, assemble the jack drive tube
to the jack and connect the drive tube to the extension tube. Place the jack under
the axle between the spring and the shock absorber with the drive tubes extending
to the rear.
• Connect the jack tube extension and wheel wrench.
NOTE:
If the bottle jack will not lower by turning the dial (thumbwheel) by hand, it may be
necessary to use the jack drive tube in order to lower the jack.
• By rotating the wheel wrench clockwise, raise the vehicle until the wheel just clears the surface.
• Remove the wheel nuts and pull the wheel off. On single rear-wheel (SRW) trucks, install the spare wheel and wheel nuts with the cone shaped end of the wheel nuts
toward the wheel. On 3500 dual rear-wheel models (DRW) the wheel nuts are a
two-piece assembly with a flat face. Lightly tighten the wheel nuts. To avoid the
risk of forcing the vehicle off the jack, do not fully tighten the wheel nuts until the
vehicle has been lowered.
• Using the lug wrench, finish tightening the wheel nuts using a crisscross pattern. The correct wheel nut tightness is 130 ft lbs (176 N·m) torque (1500 Series),
135 ft lbs (183 N·m) torque for 2500/3500 single-rear wheel (SRW) models, and
140 ft lbs (190 N·m) for 3500 dual rear-wheel models. If in doubt about the
correct tightness, have them checked with a torque wrench by your authorized
dealer or at a service station.
• Install the wheel center cap and remove the wheel blocks. Do not install chrome or aluminum wheel center caps on the spare wheel. This may result in cap damage.
• Lower the jack to its fully closed position. If the bottle jack will not lower by turning the dial (thumbwheel) by hand, it may be necessary to use the jack drive
tube in order to lower the jack. Stow the replaced tire, jack, and tools as previously
described.
• Adjust the tire pressure when possible.
NOTE:
Do not oil wheel studs. For chrome wheels, do not substitute with chrome plated
wheel nuts.
WHAT TO DO IN EMERGENCIES
183
Hub Caps/Wheel Covers
• The hub caps must be removed before raising the vehicle off the ground.
• For single rear-wheel (SRW) models, use the blade on the end of the lug wrenchto pry the hub cap off. Insert the blade end into the pry-off notch and carefully pop
off the hub cap with a back-and-forth motion.
• On models with dual rear wheels (DRW), you must first remove the hub caps. The jack handle driver has a hook at one end that will fit in the pry off notch of the rear
hub caps. Position the hook and pull out on the ratchet firmly. The hub cap should
pop off. The wheel skins can now be removed. For the front hub cap use the blade
on the end of the lug wrench to pry the caps off. The wheel skin can now be
removed.
• You must use the flat end of the lug wrench to pry off the wheel skins. Insert the flat tip completely and using a back-and-forth motion, loosen the wheel skin.
Repeat this procedure around the tire until the skin pops off.
• Replace the wheel skins first using a rubber mallet. When replacing the hub caps, tilt the cap retainer over the lug nut bolt circle and strike the high side down with
a rubber mallet. Be sure that the hub caps and wheel skins are firmly seated
around the wheel.
Wheel Nuts
All wheel nuts should be tightened occasionally to eliminate the possibility of wheel
studs being sheared or the bolt holes in the wheels becoming elongated. This is
especially important during the first few hundred miles/kilometers of operation to
allow the wheel nuts to become properly set. All wheel nuts should first be firmly
seated against the wheel. The wheel nuts should then be tightened to recommended
torque. Tighten the wheel nuts to final torque in increments. Progress around the bolt
circle, tightening the wheel nut opposite to the wheel nut just previously tightened
until final torque is achieved. Recommended torques are shown in the following
chart.
Disc Wheels
Nut Type Stud Size Hex Size Torque
Ft LbsTorque
Newton Meters
Cone M14 x 1.5 22 mm 120-150 160-200
Flanged M14 x 1.5 22 mm 130-160 190-220
WHAT TO DO IN EMERGENCIES
186
8-Stud — Dual Rear Wheels
• Dual wheels are flat-mounted and center-piloted. The lug nuts are a two-pieceassembly. When the tires are being rotated or replaced, clean these lug nuts and
add two drops of oil at the interface between the hex and the washer.
• Slots in the wheels will assist in prop- erly orienting the inner and outer
wheels. Align these slots when assem-
bling the wheels for best access to the
tire valve on the inner wheel. The tires
of both dual wheels must be com-
pletely off the ground when tightening,
to ensure wheel centering and maxi-
mum wheel clamping.
• Dual wheel models require a special heavy-duty lug nut tightening adapter
(included with the vehicle) to correctly
tighten the lug nuts. Also, when it is necessary to remove and install dual rear
wheels, use a proper vehicle lifting device.
NOTE:
When installing a spare tire as part of a dual rear wheel end combination, the tire
diameter of the two individual tires must be compared. If there is a significant
difference, the larger tire should be installed in a front location. The correct direction
of rotation for dual tire installations must also be observed.
These dual rear wheels should be tightened as follows:
1. Tighten the wheel nuts in the num- bered sequence to a snug fit.
2. Retighten the wheel nuts in the same sequence to the torques listed in the
table. Go through the sequence a
second time to verify that specific
torque has been achieved. Retighten to
specifications at 100 miles (160 km)
and after 500 miles (800 km).
• It is recommended that wheel stud
nuts be kept torqued to specifications
at all times. Torque wheel stud nuts to specifications at each lubrication interval.
WHAT TO DO IN EMERGENCIES
187
Spark Plugs..............205
Speed Control Accel/Decel ............36
Speed Control (Cruise Control) ....35
Starting ColdWeather ........ 146, 156
Remote ...............13
Starting Procedures (Diesel Engines) .......145, 155
Stuck, Freeing .............196
SunRoof ................48
Tailgate ................129
Temperature Control, Automatic (ATC).................45
Tether Anchor, Child Restraint ....18
Tires Air Pressure ...........234
Changing .............178
FlatChanging ..........178
Jacking ..............178
Pressure Warning Light .....169
Tow/Haul ................138
Tow Hooks, Emergency ........192
Towing Disabled Vehicle .........196
Recreational ...........140
Towing Vehicle Behind a Motorhome.............140
Traction Control ............172 Trailer Towing
Trailer and Tongue Weight . . .136
Transfer Case Fluid ................205
Transmission Fluid ................205
Warning Light ..........174
TurboCoolDown........ 149, 162
TurnSignals...............33
Uconnect
®3.0.............67
Uconnect®5.0.............70
Uconnect®8.4A ............78
Uconnect®8.4AN ...........96
Uconnect®Access ...........53
Vehicle Security Alarm Disarming . .14
Ventilated Seats ............28
Washers, Windshield ..........33
Water in Fuel . . .146, 147, 156, 158
Water Separator, Diesel Fuel .......... 147, 158
Water Separator Draining . . .147, 158
WheelandWheelTrimCare.....234
Wheel Cover ..............186
WheelNutTorque...........186
Wind Buffeting .............49
WindshieldWashers ..........33
WindshieldWipers...........33
INDEX
244