2003 DODGE RAM battery

(7) Using a new pressure relief valve gasket,
install the relief valve plug. Tighten the plug to 20
N´m (15 ft. lbs.) torque.
(8) Install oil filter that has been filled with oil.
INTAKE MANIFOLD
DESCRIPTION
The aluminum intake manifold (Fig. 65) has two
plenum chambers an upper and lower which supply
air to five runners each. Passages across the longitu-
dinal center of the manifold feed air from the throttle
body to the plenum chambers.
DIAGNOSIS AND TESTINGÐINTAKE
MANIFOLD LEAKAGE
An intake manifold air leak is characterized by
lower than normal manifold vacuum. Also, one or
more cylinders may not be functioning.
WARNING: USE EXTREME CAUTION WHEN THE
ENGINE IS OPERATING. DO NOT STAND IN A
DIRECT LINE WITH THE FAN. DO NOT PUT YOUR
HANDS NEAR THE PULLEYS, BELTS, OR THE FAN.
DO NOT WEAR LOOSE CLOTHING.
(1) Start the engine.
(2) Spray a small stream of water at the suspected
leak area.(3) If a change in RPMs occur, the area of the sus-
pected leak has been found.
(4) Repair as required.
REMOVAL
(1) Disconnect the negative cable from the battery.
(2) Drain the cooling system (Refer to 7 - COOL-
ING - STANDARD PROCEDURE).
(3) Remove the accessory drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
REMOVAL).
(4) Remove the generator brace and generator
(Fig. 66).
(5) Remove the A/C compressor brace (Fig. 66).
Remove the compressor and set aside.
(6) Remove the air cleaner cover and filter.
Remove the air cleaner housing (Fig. 67). Discard the
gasket.
(7) Perform the Fuel System Pressure release pro-
cedure (Refer to 14 - FUEL SYSTEM/FUEL DELIV-
ERY - STANDARD PROCEDURE). Disconnect the
fuel lines (Refer to 14 - FUEL SYSTEM/FUEL
DELIVERY/QUICK CONNECT FITTING - STAN-
DARD PROCEDURE).
(8) Disconnect the accelerator linkage and if so
equipped, the speed control and transmission kick-
down cables.
(9) Remove the coil assemblies with the ignition
wires.
(10) Disconnect the vacuum lines.
(11) Disconnect the heater hoses and bypass hose.
(12) Remove the closed crankcase ventilation and
evaporation control systems.
Fig. 65 Upper and Lower Intake ManifoldÐ8.0L
Engine
1 - UPPER INTAKE MANIFOLD
2 - THROTTLE BODY (MPI)
3 - LOWER INTAKE MANIFOLD
Fig. 66 Generator and A/C Compressor Braces
1 - GENERATOR
2 - INTAKE MANIFOLD TO GENERATOR BRACE
3 - A/C COMPRESSOR
4 - INTAKE MANIFOLD TO A/C COMPRESSOR BRACE
DRENGINE 8.0L 9 - 401
OIL PUMP (Continued)

(2) Insert MopartGEN II Silicone Rubber Adhe-
sive Sealant, or equivalent, into the four corner joints
an excessive amount of sealant is not required to
ensure a leak proof seal. However, an excessive
amount of sealant may reduce the effectiveness of
the flange gasket. The sealant should be approxi-
mately 5 mm (0.2 in.) in diameter. (Fig. 70).
(3) Position the cross-over gaskets and press firmly
onto the block (Fig. 70).BE SURE THE BLOCK IS
OIL FREE..
(4) The lower intake manifold MUST be installed
within 3 minutes of sealant application. Carefully
lower intake manifold into position on the cylinder
block and heads. After intake manifold is in place,
inspect to make sure seals and gaskets are in place.
Finger start all the lower intake bolts.
(5) Tighten the lower intake manifold bolts in
sequence to 54 N´m (40 ft. lbs.) torque (Fig. 69).
Recheck all bolts are tightened to 54 N´m (40 ft. lbs.)
torque.
(6) Using a new gasket, position the upper intake
manifold onto the lower intake manifold.
(7) Finger start all bolts, alternate one side to the
other.
(8) Tighten upper intake manifold bolts in
sequence to 22 N´m (16 ft. lbs.) torque (Fig. 68).
(9) Using a new gasket, install the throttle body
onto the upper intake manifold. Tighten the bolts to
23 N´m (200 in. lbs.) torque.
(10) Install closed crankcase ventilation and evap-
oration control systems.
(11) Connect the heater hoses and bypass hose.
(12) Connect the vacuum lines.
(13) Install the coil assemblies and the ignition
wires.
(14) Connect the accelerator linkage and if so
equipped, the speed control and transmission kick-
down cables.(15) Install the fuel lines (Refer to 14 - FUEL SYS-
TEM/FUEL DELIVERY/QUICK CONNECT FIT-
TING - STANDARD PROCEDURE).
(16) Using a new gasket, install the air cleaner
housing. Tighten the nuts to 11 N´m (96 in. lbs.)
torque. Install the air cleaner filter and cover.
(17) Install the A/C compressor (Refer to 24 -
HEATING & AIR CONDITIONING/PLUMBING/A/C
COMPRESSOR - INSTALLATION). Position the com-
pressor brace and install the bolts. Tighten the brace
bolts to 41 N´m (30 ft. lbs.) torque.
(18) Install the generator (Refer to 8 - ELECTRI-
CAL/CHARGING/GENERATOR - INSTALLATION).
Position the generator brace and install the bolts.
Tighten the brace bolts to 41 N´m (30 ft. lbs.) torque.
(19) Install the accessory drive belt (Refer to 7 -
COOLING/ACCESSORY DRIVE/DRIVE BELTS -
INSTALLATION).
(20) Fill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(21) Connect the negative cable to the battery.
(22) Start engine check for leaks.
EXHAUST MANIFOLD
DESCRIPTION
Engine exhaust manifolds (Fig. 72) are made of
high molybdenum ductile cast iron. A special ribbed
design helps control permanent dimensional changes
during heat cycles.
OPERATION
The exhaust manifolds collect the engine exhaust
exiting the combustion chambers, then channels the
exhaust gases to the exhaust pipes attached to the
manifolds.
Fig. 71 Intake Manifold Flange
1 - LOCATOR DOWELS
2 - INTAKE MANIFOLD GASKETS
3 - LOCATOR DOWELS
Fig. 72 Exhaust ManifoldÐ8.0L Engine
1 - EXHAUST MANIFOLD
DRENGINE 8.0L 9 - 403
INTAKE MANIFOLD (Continued)

REMOVAL
(1) Disconnect the negative cable from the battery.
(2) Raise and support the vehicle.
(3) Remove the bolts and nuts attaching the
exhaust pipe to the engine exhaust manifold..
(4) Lower the vehicle.
(5) Remove the exhaust heat shields (Fig. 73).
(6) Remove the dipstick bracket from the exhaust
manifold (right side only).
(7)
Remove bolts attaching manifold to cylinder head.
(8) Remove manifold from the cylinder head. Dis-
card the gasket.
CLEANING
Clean mating surfaces on cylinder head and mani-
fold. Wash with solvent and blow dry with com-
pressed air.
INSPECTION
Inspect manifold for cracks.
Inspect mating surfaces of manifold for flatness
with a straight edge. Gasket surfaces must be flat
within 0.2 mm per 300 mm (0.008 inch per foot).
INSTALLATION
(1) Using a new gasket position the engine
exhaust manifold onto the cylinder head. Install bolts
and stud bolts in the proper position. (Fig. 73)
Tighten the bolts to 22 N´m (16 ft. lbs.) torque.
(2) Install the dipstick bracket on to the exhaust
manifold (right side only).(3) Position washers and exhaust heat shields onto
the manifold stud bolts (Fig. 73). Be sure the tabs on
the heat shields are hooked over the top of the
exhaust gasket. Install the nuts and tighten to 20
N´m (175 in. lbs.) torque.
(4) Raise and support the vehicle.
(5) Assemble exhaust pipe to manifold.
(6) Lower the vehicle.
(7) Connect the negative cable to the battery.
(8) Start engine check for leaks.
TIMING BELT / CHAIN
COVER(S)
REMOVAL
(1) Disconnect the negative cable from the battery.
(2) Drain cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(3) Remove the serpentine belt (Refer to 7 - COOL-
ING/ACCESSORY DRIVE/DRIVE BELTS - REMOV-
AL).
(4) Remove fan and fan shroud (Refer to 7 -
COOLING/ENGINE/RADIATOR FAN - REMOVAL).
(5) Unbolt A/C compressor and set on top of
engine.
(6) Remove generator, air pump, and bracket
assembly.
(7) Remove water pump (Refer to 7 - COOLING/
ENGINE/WATER PUMP - REMOVAL).
(8) Remove damper bolt and washer.
(9) Using Special Tool 1026 3-Jaw Puller remove
pulley/damper from the crankshaft. (Fig. 74)
(10)
Loosen oil pan bolts and remove the front oil
pan bolts that mount the pan to the timing chain cover.
(11) Remove the cover bolts.
(12) Remove timing chain cover and gasket using
extreme caution to avoid damaging oil pan gasket.
(13) Inspect surface of cover. Remove any burrs or
high spots.
INSTALLATION
(1) Be sure mating surfaces of timing chain cover
and cylinder block are clean and free from burrs.
(2) Lubricate the pump rotors using petroleum
jelly or lubriplate (Refer to 9 - ENGINE/LUBRICA-
TION/OIL PUMP - INSTALLATION).
(3) Using a new cover gasket, carefully install tim-
ing chain cover to avoid damaging oil pan gasket.
Use a small amount of MopartSilicone Rubber Adhe-
sive Sealant, or equivalent, at the joint between tim-
ing chain cover gasket and the oil pan gasket. Finger
tighten the timing chain cover bolts at this time.
(4) Tighten timing chain cover bolts to 47 N´m (35
ft. lbs.) torque. Tighten oil pan bolts to 24 N´m (215
in. lbs.) torque.
Fig. 73 8.0L Engine Exhaust ManifoldÐTypical
1 - EXHAUST MANIFOLD
2 - HEAT SHIELD
9 - 404 ENGINE 8.0LDR
EXHAUST MANIFOLD (Continued)

(5) Using Special Tool C-3688 Crankshaft Pulley/
Damper Installer Install pulley/vibration damper
(Fig. 75)
(6) Prime oil pump by squirting oil in the oil filter
mounting hole and filling the J-trap of the front tim-
ing cover. When oil is running out, install oil filter
that has been filled with oil.(7) Install water pump and housing assembly
using new o-ring (Refer to 7 - COOLING/ENGINE/
WATER PUMP - INSTALLATION).
(8) Install generator, air pump, and bracket assem-
bly.
(9) Install A/C compressor (Refer to 24 - HEATING
& AIR CONDITIONING/PLUMBING/A/C COM-
PRESSOR - INSTALLATION).
(10) (10) Install the radiator fan (Refer to 7 -
COOLING/ENGINE/RADIATOR FAN - INSTALLA-
TION).
(11) Position the fan shroud and install the bolts.
Tighten the bolts to 11 N´m (95 in. lbs.) torque.
(12) Install the serpentine belt (Refer to 7 - COOL-
ING/ACCESSORY DRIVE/DRIVE BELTS - INSTAL-
LATION).
(13) Fill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(14) Connect the negative cable to the battery.
(15) Road test vehicle and check for leaks.
TIMING BELT/CHAIN AND
SPROCKETS
REMOVAL
(1) Remove timing chain cover and gasket using
extreme caution to avoid damaging oil pan gasket
(Refer to 9 - ENGINE/VALVE TIMING/TIMING
BELT / CHAIN COVER(S) - REMOVAL).
(2) Aline camshaft and crankshaft centerline.
Remove camshaft sprocket attaching bolt and remove
timing chain and camshaft sprockets.
(3) Use puller 6444 and jaws 6820 to remove
crankshaft sprocket (Fig. 76).
INSPECTIONÐMEASURING TIMING CHAIN
STRETCH
(1) Place a scale next to the timing chain so that
any movement of the chain may be measured.
(2) Place a torque wrench and socket over cam-
shaft sprocket attaching bolt. Apply torque in the
direction of crankshaft rotation to take up slack; 41
N´m (30 ft. lbs.) torque with cylinder head installed
or 20 N´m (15 ft. lbs.) torque with cylinder head
removed. With a torque applied to the camshaft
sprocket bolt, crankshaft should not be permitted to
move. It may be necessary to block the crankshaft to
prevent rotation.
(3) Hold a scale with dimensional reading even
with the edge of a chain link. With cylinder heads
installed, apply 14 N´m (30 ft. lbs.) torque in the
reverse direction. With the cylinder heads removed,
apply 20 N´m (15 ft. lbs.) torque in the reverse direc-
tion. Note the amount of chain movement (Fig. 77).
Fig. 74 PulleyÐDamper Removal
1-3JAWPULLER
Fig. 75 Installing Crankshaft
1 - SPECIAL TOOL C-3688
DRENGINE 8.0L 9 - 405
TIMING BELT / CHAIN COVER(S) (Continued)

INSTALLATION
(1) Connect the exhaust pipe(s) to the exhaust
manifold. Tighten the nuts to 34 N´m (25 ft. lbs.)
torque.
(2) Align and connect the exhaust pipe to the cat-
alytic converter flange (Fig. 4). Install exhaust clamp
and tighten clamp nuts to 47 N´m (35 ft. lbs.) torque.
(3) Connect oxygen sensor connector(s).
(4) Lower the vehicle.
(5) Start the engine and inspect for exhaust leaks
and exhaust system contact with the body panels.
Adjust the alignment, if needed.
EXHAUST PIPE
REMOVAL
(1) Disconnect the battery negative cables.
(2) Raise and support the vehicle on a hoist.
(3) Saturate the bolts and nuts with heat valve
lubricant. Allow 5 minutes for penetration.
(4) Remove the exhaust pipe-to-extension pipe
clamp. Separate the exhaust pipe and extension pipe.
(5) Remove the exhaust pipe-to-turbocharger elbow
clamp (Fig. 5).
(6) Remove the exhaust pipe from the transmis-
sion support (Fig. 5).
INSPECTION
Discard rusted clamps, broken or worn supports
and attaching parts. Replace a component with orig-
inal equipment parts, or equivalent. This will assure
proper alignment with other parts in the system and
provide acceptable exhaust noise levels.
INSTALLATION
(1) Install the exhaust pipe into the transmission
support and onto the turbocharger flange.
(2) Install the exhaust pipe-to-turbocharger elbow
clamp and tighten to 31 N´m (23 ft. lbs.) torque.
(3) Install the extension pipe and clamp to the
exhaust pipe using a new clamp and tighten the
clamp nuts to 48 N´m (35 ft. lbs.) torque.
(4) Lower the vehicle.
(5) Connect the battery negative cables.
(6) Start the engine and inspect for exhaust leaks
and exhaust system contact with the body panels. A
minimum of 25.4 mm (1.0 in.) is required. Adjust the
alignment, if needed.
HEAT SHIELDS
DESCRIPTION
There are two types of heat shields used. One is
stamped steel the other is molded foil sheets. The
shields attach to the vehicle around the exhaust sys-
tem to prevent heat from the exhaust system from
entering the passenger area and other areas where
the heat can cause damage to other components.
REMOVAL
(1) Raise and support the vehicle.
(2) Remove the nuts or bolts holding the exhaust
heat shield to the floor pan (Fig. 6) (Fig. 7) (Fig. 8),
crossmember or bracket.
Fig. 4 Exhaust Pipe-to-Catalytic Converter Flange
AlignmentÐTypical
1 - 7.874±17.526 mm (0.31±0.69 in.)
2 - CATALYTIC CONVERTER FLANGE
3 - 20 mm (0.79 in.) MIN.
4 - CROSSMEMBER
5 - EXHAUST PIPE
6 - EXHAUST PIPE
Fig. 5 Exhaust Pipe
1 - Clamp
2 - Support
3 - EXHAUST PIPE
DREXHAUST SYSTEM 11 - 7
EXHAUST PIPE (Continued)

MUFFLER - 5.9L DIESEL
REMOVAL
(1) Disconnect the battery negative cables.
(2) Raise and support the vehicle.
(3) Remove the muffler to tail pipe and extension
pipe clamps (Fig. 10).
(4) Disconnect the muffler from the hanger isola-
tors (Fig. 10).
(5) Disconnect the muffler from the tailpipe.
(6) Disconnect the muffler from the extension pipe
and remove from the vehicle.
INSTALLATION
(1) Install the muffler hanger rods into the isola-
tors (Fig. 10).
(2) Install the muffler into the extension pipe.
(3) Install the muffler into the tail pipe.
(4) Install the exhaust clamps, align the exhaust
system, and tighten the exhaust clamps to 48 N´m
(35 ft. lbs.) torque.
(5) Lower the vehicle.
(6) Connect the battery negative cables.
(7) Start the engine and inspect for exhaust leaks
and exhaust system contact with the body panels. A
minimum of 25.4 mm (1.0 in.) is required between
exhaust system components and body/frame parts.
Adjust the alignment, if needed.
TAILPIPE - 5.9L DIESEL
REMOVAL
(1) Disconnect the battery negative cables.
(2) Raise and support the vehicle.
(3) Saturate the clamp nuts with heat valve lubri-
cant. Allow 5 minutes for penetration.
(4) Disconnect the exhaust tailpipe support hanger
isolators (Fig. 11).
(5) Remove the muffler-to-tailpipe clamps (Fig. 11).
(6) Remove the tailpipe from the vehicle.
INSPECTION
Discard rusted clamps, broken or worn supports
and attaching parts. Replace a component with orig-
inal equipment parts, or equivalent. This will assure
proper alignment with other parts in the system and
provide acceptable exhaust noise levels.
INSTALLATION
(1) Install the tailpipe into the muffler.
(2) Install the tailpipe hanger rods into the isola-
tors (Fig. 11)
(3) Install the exhaust clamp, align the exhaust
system, and tighten the clamp 48 N´m (35 ft. lbs.)
torque.
Fig. 9 MUFFLER
1 - INSULATOR
2 - INSULATOR
3 - MUFFLER
4 - INSULATOR
Fig. 10 Muffler Removal/Installation
1 - INSULATOR
2 - ISOLATOR
3 - TAILPIPE
4 - CLAMP
5 - MUFFLER
6 - CLAMP
7 - EXTENSION PIPE
DREXHAUST SYSTEM 11 - 9
MUFFLER (Continued)

(4) Lower the vehicle.
(5) Connect the battery negative cables.
(6) Start the engine and inspect for exhaust leaks
and exhaust system contact with the body panels.
Adjust the alignment, if needed.
TAILPIPE
REMOVAL
(1) Raise and support the vehicle.
(2) Saturate the clamp nuts with heat valve lubri-
cant. Allow 5 minutes for penetration.
(3) Disconnect the exhaust tailpipe support hanger
(Fig. 12).
(4) Remove clamps and nuts.
(5) Remove the exhaust tailpipe.
INSPECTION
Discard rusted clamps, broken or worn supports
and attaching parts. Replace a component with orig-
inal equipment parts, or equivalent. This will assure
proper alignment with other parts in the system and
provide acceptable exhaust noise levels.
INSTALLATION
(1) Loosely assemble exhaust tailpipe to permit
proper alignment of all parts.
(2) Connect the support hangers.(3) Position the exhaust tailpipe for proper clear-
ance with the underbody parts.
(4) Tighten all clamp nuts to 48 N´m (35 ft. lbs.)
torque.
(5) Lower the vehicle.
(6) Start the engine and inspect for exhaust leaks
and exhaust system contact with the body panels. A
minimum of 25.4 mm (1.0 in.) is required between
the exhaust system components and body/frame
parts. Adjust the alignment, if needed.
TURBOCHARGER SYSTEM
DIAGNOSIS AND TESTING - TURBOCHARGER
BOOST PRESSURE
NOTE: This diagnostic procedure is to be used with
the DRB IIITwhile test driving the vehicle under
normal load and driving conditions.
Low turbocharger boost pressure can cause poor
engine performance and driveability concerns. The
following procedure will test the turbocharger boost
pressure.
Fig. 11 Tailpipe Removal/Installation
1 - ISOLATOR
2 - TAILPIPRE
3 - CLAMP
4 - MUFFLER
Fig. 12 TAILPIPE
1 - INSULATOR
2 - TAILPIPE
3 - CLAMP
4 - MUFFLER
5 - CLAMP
6 - INSULATOR
7 - INSULATOR
8 - INSULATOR
11 - 10 EXHAUST SYSTEMDR
TAILPIPE - 5.9L DIESEL (Continued)

TURBOCHARGER(COOL DOWN(CHART
Driving Load Turbocharger Idle Time (in
minuetes)
Condition Temperature Before Shut
Down
Stop & Go Empty Cool Less than 1
Stop & Go Medium Warm 1
Highway
SpeedsMedium Warm 2
City Traffic Max.
GCWRWarm 3
Highway
SpeedsMax.
GCWRWarm 4
Uphill
GradeMax.
GCWRHot 5
REMOVAL
(1) Disconnect the battery negative cables.
(2) Raise vehicle on hoist.
(3) Disconnect the exhaust pipe from the turbo-
charger elbow(Refer to 11 - EXHAUST SYSTEM/EX-
HAUST PIPE - REMOVAL).
(4) Lower vehicle.
(5) Disconnect the turbocharger air inlet hose (Fig.
18).
(6) Disconnect the turbocharger oil supply line and
the oil drain tube from the turbocharger (Fig. 19).
(7) Disconnect the charge air cooler inlet pipe from
the turbocharger compressor outlet (Fig. 19).
(8) Remove the turbocharger and gasket from the
exhaust manifold.
Fig. 17 Turbocharger Oil Supply and Drain
1 - BEARINGS
2 - OIL SUPPLY (FROM FILTER HEAD)
3 - OIL RETURN (TO SUMP)
Fig. 18 Turbocharger Air Inlet Hose
1 - AIR INLET TUBE
2 - AIR FILTER HOUSING
3 - TURBOCHARGER
Fig. 19 Oil Supply Line and Charge Air Cooler Inlet
Duct
1 - TURBOCHARGERR EXHAUST ELBOW
2 - TURBOCHARGER
3 - OIL SUPPLY LINE
4 - AIR INLET TUBE
5 - TURBOCHARGER COMPRESSOR OUTLET
6 - OIL DRAIN LINE
DREXHAUST SYSTEM 11 - 13
TURBOCHARGER (Continued)