Page 1265 of 2255

(8) Remove viscous fan/drive assembly (Refer to 7 -
COOLING/ENGINE/RADIATOR FAN - REMOVAL).
(9) Remove the accessory drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).
(10) Remove the cooling fan support/hub from the
front of the engine (Fig. 179).
(11) Raise the vehicle on hoist.
(12) Remove the crankshaft damper (Fig. 180)
(Refer to 9 - ENGINE/ENGINE BLOCK/VIBRATION
DAMPER - REMOVAL).
(13) Lower the vehicle.
(14) Remove the gear cover-to-housing bolts and
gently pry the cover away from the housing, taking
care not to mar the gasket surfaces.
INSTALLATION
(1) Obtain a seal pilot/installation tool from a
crankshaft front seal service kit and install the pilot
into the seal.
(2) Apply a bead of MopartSilicone Rubber Adhe-
sive Sealant or equivalent to the gear housing cover.
Be sure to surround all through holes.
(3) Using the seal pilot to align the cover (Fig.
182), install the cover to the housing and install the
bolts. Tighten the bolts to 24 N´m (18 ft. lbs.) torque.
(4) Remove the seal pilot.
(5) Raise the vehicle.
(6) Install the crankshaft damper (Fig. 180) (Refer
to 9 - ENGINE/ENGINE BLOCK/VIBRATION
DAMPER - INSTALLATION).
(7) Lower vehicle.
Fig. 179 Fan Support/Hub AssemblyÐRemoval/
Installation
1 - FAN SUPPORT/HUB
2 - FAN PULLEY
Fig. 180 Crankshaft DamperÐRemoval/Installation
1 - DAMPER
2 - BOLT
Fig. 181 Gear Housing and Cover
1 - GEAR HOUSING
2 - GEAR HOUSING COVER
Fig. 182 Installing Cover with Seal Pilot
1 - SEAL PILOT
9 - 190 ENGINE 5.9L DIESELBR/BE
GEAR HOUSING COVER (Continued)
Page 1266 of 2255
(8) Install the fan support/hub assy. (Fig. 179) and
tighten bolts to 24 N´m (18 ft. lbs.) torque.
(9) Install the accessory drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
INSTALLATION).
(10) Install the cooling fan and shroud together
(Refer to 7 - COOLING/ENGINE/RADIATOR FAN -
INSTALLATION).
(11) Install the windshield washer reservoir to the
fan shroud and connect the washer pump supply
hose and electrical connection.(12) Install the coolant recovery bottle to the fan
shroud and connect the hose to the radiator filler
neck.
(13) Install the radiator upper hose and clamps.
(14) Add coolant (Refer to 7 - COOLING - STAN-
DARD PROCEDURE).
(15) Connect the battery cables.
(16) Start engine and inspect for leaks.
BR/BEENGINE 5.9L DIESEL 9 - 191
GEAR HOUSING COVER (Continued)
Page 1267 of 2255
Page 1268 of 2255

EXHAUST SYSTEM
TABLE OF CONTENTS
page page
EXHAUST SYSTEM
DESCRIPTION
DESCRIPTION - 5.9/8.0L.................2
DESCRIPTIONÐ5.9L DIESEL.............3
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - GAS ENGINE . . . 4
DIAGNOSIS AND TESTING - DIESEL
ENGINE..............................4
SPECIFICATIONS
TORQUE.............................5
CATALYTIC CONVERTER - 3.9L/5.2L/5.9L
DESCRIPTION..........................5
OPERATION............................5
REMOVAL.............................5
INSPECTION...........................6
INSTALLATION..........................6
CATALYTIC CONVERTER - 5.9L HD/8.0L
DESCRIPTION..........................6
OPERATION............................6
REMOVAL.............................6
INSPECTION...........................6
INSTALLATION..........................7
EXHAUST PIPE - 3.9L/5.2L/5.9L
REMOVAL.............................7
INSPECTION...........................7
INSTALLATION..........................7
EXHAUST PIPE - 5.9L HD/8.0L
REMOVAL.............................7
INSPECTION...........................8
INSTALLATION..........................8
EXHAUST PIPE - 5.9L DIESEL
REMOVAL.............................9
INSPECTION...........................9
INSTALLATION..........................9
HEAT SHIELDS
DESCRIPTION.........................10
REMOVAL.............................10
INSTALLATION.........................10
MUFFLER - 3.9L/5.2L/5.9L/8.0L
REMOVAL.............................10INSTALLATION.........................10
MUFFLER - 5.9L DIESEL
REMOVAL.............................11
INSTALLATION.........................11
TAILPIPE - 3.9L/5.2L/5.9L
REMOVAL.............................11
INSPECTION..........................11
INSTALLATION.........................11
TAILPIPE - 5.9L HD/8.0L
REMOVAL.............................12
INSPECTION..........................12
INSTALLATION.........................12
TAILPIPE - 5.9L DIESEL
REMOVAL.............................12
INSPECTION..........................12
INSTALLATION.........................13
RESONATOR
REMOVAL.............................13
INSTALLATION.........................13
TURBOCHARGER SYSTEM
DIAGNOSIS AND TESTING -
TURBOCHARGER BOOST PRESSURE.....13
TURBOCHARGER
DESCRIPTION.........................14
OPERATION...........................14
REMOVAL.............................15
CLEANING............................16
INSPECTION..........................16
INSTALLATION.........................17
CHARGE AIR COOLER AND PLUMBING
DESCRIPTION.........................18
OPERATION...........................18
DIAGNOSIS AND TESTING - CHARGE AIR
COOLER SYSTEM - LEAKS..............18
REMOVAL.............................18
CLEANING............................19
INSPECTION..........................19
INSTALLATION.........................20
BR/BEEXHAUST SYSTEM 11 - 1
Page 1269 of 2255

EXHAUST SYSTEM
DESCRIPTION
DESCRIPTION - 5.9/8.0L
CAUTION: Avoid application of rust prevention com-
pounds or undercoating materials to exhaust sys-
tem floor pan exhaust heat shields. Light overspray
near the edges is permitted. Application of coating
will result in excessive floor pan temperatures and
objectionable fumes.The federal gasoline engine exhaust system (Fig. 1)
consists of engine exhaust manifolds, exhaust pipes,
catalytic converter(s), extension pipe (if needed),
exhaust heat shields, muffler and exhaust tailpipe.
The California emission vehicles exhaust system
also contains the above components as well as mini
catalytic converters added to the exhaust pipe (Fig.
2).
The exhaust system must be properly aligned to
prevent stress, leakage and body contact. Minimum
clearance between any exhaust component and the
body or frame is 25.4 mm (1.0 in.). If the system con-
tacts any body panel, it may amplify objectionable
noises from the engine or body.
Fig. 1 Exhaust System Gasoline EnginesÐFederal Emissions (Typical)
1 - CATALYTIC CONVERTER
2 - TAILPIPE
3 - MUFFLER4 - CATALYTIC CONVERTERS
5 - AIR INDUCTION LINES
6 - EXHAUST PIPE
11 - 2 EXHAUST SYSTEMBR/BE
Page 1270 of 2255

DESCRIPTIONÐ5.9L DIESEL
CAUTION: Avoid application of rust prevention com-
pounds or undercoating materials to exhaust sys-
tem floor pan exhaust heat shields. Light overspray
near the edges is permitted. Application of coating
will result in excessive floor pan temperatures and
objectionable fumes.
The diesel engine exhaust system consists of an
engine exhaust manifold, turbocharger, exhaust pipe,
resonator, extension pipe (if needed), muffler and
exhaust tailpipe.
The exhaust system must be properly aligned to
prevent stress, leakage and body contact. The
exhaust components should be kept a minimum of
25.4 mm (1.0 in.) away from the body and frame. If
the system contacts any body panel, it may amplify
objectionable noises from the engine or body.
Fig. 2 Catalytic Converter with Pipes and Mini
Catalytic Converters
1 - BOLT
2 - RETAINER
3 - EXHAUST MANIFOLD
4 - NUT
5 - MINI CATALYTIC CONVERTER
6 - CATALYTIC CONVERTER WITH PIPES
BR/BEEXHAUST SYSTEM 11 - 3
EXHAUST SYSTEM (Continued)
Page 1271 of 2255

DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - GAS ENGINE
EXHAUST SYSTEM DIAGNOSIS CHART
CONDITION POSSIBLE CAUSE CORRECTION
EXCESSIVE EXHAUST
NOISE OR LEAKING
EXHAUST GASES1. Leaks at pipe joints. 1. Tighten clamps/bolts at leaking joints.
2. Rusted or blown out muffler. 2. Replace muffler. Inspect exhaust
system.
3. Broken or rusted out exhaust pipe. 3. Replace exhaust pipe.
4. Exhaust pipe leaking at manifold
flange.4. Tighten/replace flange attaching
nuts/bolts.
5. Exhaust manifold cracked or broken. 5. Replace exhaust manifold.
6. Leak between exhaust manifold and
cylinder head.6. Tighten exhaust manifold to cylinder
head bolts.
7. Catalytic converter rusted or blown
out.7. Replace catalytic converter assy.
8. Restriction in exhaust system. 8. Remove restriction, if possible.
Replace restricted part if necessary.
caution:
When servicing and replacing exhaust system components, disconnect the oxygen sensor connector(s). Allowing
the exhaust to hang by the oxygen sensor wires will damage the harness and/or sensor.
DIAGNOSIS AND TESTING - DIESEL ENGINE
EXHAUST SYSTEM DIAGNOSIS CHART
CONDITION POSSIBLE CAUSE CORRECTION
EXCESSIVE EXHAUST
NOISE OR LEAKING
EXHAUST GASES1. Leaks at pipe joints. 1. Tighten clamps/bolts at leaking joints.
2. Rusted or blown out muffler. 2. Replace muffler. Inspect exhaust
system.
3. Broken or rusted out exhaust pipe. 3. Replace exhaust pipe.
4. Exhaust pipe leaking at manifold
flange.4. Tighten/replace flange attaching
nuts/bolts.
5. Exhaust manifold cracked or broken. 5. Replace exhaust manifold.
6. Leak between exhaust manifold and
cylinder head.6. Tighten exhaust manifold to cylinder
head bolts.
7. Turbocharger mounting flange
cracked.7. Remove turbocharger and inspect.
(Refer to 11 - EXHAUST SYSTEM/
TURBOCHARGER SYSTEM/
TURBOCHARGER - REMOVAL).
8. Restriction in exhaust system. 8. Remove restriction, if possible.
Replace restricted part if necessary.
11 - 4 EXHAUST SYSTEMBR/BE
EXHAUST SYSTEM (Continued)
Page 1272 of 2255

SPECIFICATIONS
TORQUE
DESCRIPTION N´m Ft. In.
Lbs. Lbs.
Adjusting StrapÐBolt 23 Ð 200
Air Heater Power SupplyÐ
Nuts14 Ð 124
Air Inlet HousingÐBolts 24 18 Ð
Cab Heater Supply/Return
LineÐNuts24 18 Ð
Exhaust ClampÐNuts 48 35 Ð
Exhaust Manifold to Cylinder
HeadÐBolts
(Diesel Engine) 43 32 Ð
Exhaust Manifold to Cylinder
HeadÐBolts
(5.9L) 31 23 Ð
Exhaust Manifold to Cylinder
HeadÐBolts
(8.0L) 22 Ð 195
Exhaust Pipe to ManifoldÐ
Bolts31 23 Ð
Generator MountingÐBolts 41 30 Ð
Charge Air Cooler
MountingÐBolts2Ð17
Charge Air Cooler DuctÐ
Nuts8Ð72
Heat ShieldÐNuts and Bolts 11 Ð 100
Turbocharger MountingÐ
Nuts32 24 Ð
Turbocharger Oil Drain
TubeÐBolts24 18 Ð
Turbocharger Oil Supply
LineÐFitting15 Ð 133
Turbocharger V-Band
ClampÐNut9Ð75
CATALYTIC CONVERTER -
3.9L/5.2L/5.9L
DESCRIPTION
The stainless steel catalytic converter is located
under the vehicle, integral to the exhaust pipe(s).
OPERATION
The catalytic converter captures and burns any
unburned fuel mixture exiting the combustion cham-
bers during the exhaust stroke of the engine. This
process aids in reducing emissions output.
REMOVAL
(1) Raise and support vehicle.
(2) Saturate the bolts and nuts with heat valve
lubricant. Allow 5 minutes for penetration.
(3) Remove clamps and nuts (Fig. 3) (Fig. 4).
(4) Remove the catalytic converter.
Fig. 3 Catalytic Converter and Exhaust Pipe 3.9L,
5.2L and 5.9L Light Duty ( Federal )
1 - BOLT
2 - EXHAUST PIPE W/CONVERTER
3 - NUT
4 - RETAINER
BR/BEEXHAUST SYSTEM 11 - 5
EXHAUST SYSTEM (Continued)