1998 DODGE RAM 1500 Timing

(9) Lubricate idler shaft and bushings with clean
engine oil.
(10) Install all chains, crankshaft sprocket, and
idler sprocket as an assembly (Fig. 136). After guid-
ing both secondary chains through the block and cyl-
inder head openings, affix chains with a elastic strap
or the equivalent, This will maintain tension on
chains to aid in installation.
NOTE: It will be necessary to slightly rotate cam-
shafts for sprocket installation.
(11) Align left camshaft sprocket ªLº dot to plated
link on chain.
(12) Align right camshaft sprocket ªRº dot to
plated link on chain.
CAUTION: Remove excess oil from the camshaft
sprocket bolt. Failure to do so can result in over-
torque of bolt resulting in bolt failure.
(13) Remove Special Tool 8515, then attach both
sprockets to camshafts. Remove excess oil from bolts,
then Install sprocket bolts, but do not tighten at this
time.
(14) Verify that all plated links are aligned with
the marks on all sprockets and the ªV8º marks on
camshaft sprockets are at the 12 o'clock position (Fig.
133).
CAUTION: Ensure the plate between the left sec-
ondary chain tensioner and block is correctly
installed.(15) Install both secondary chain tensioners.
Tighten bolts to 28 N´m (250 in. lbs.).
NOTE: Left and right secondary chain tensioners
are not common.
(16) Before installing idler sprocket bolt, lubricate
washer with oil, and tighten idler sprocket assembly
retaining bolt to 34 N´m (25 ft. lbs.).
(17) Remove all locking pins (3) from tensioners.
CAUTION: After pulling locking pins out of each
tensioner, DO NOT manually extend the tensioner(s)
ratchet. Doing so will over tension the chains,
resulting in noise and/or high timing chain loads.
(18) Using Special Tool 6958, Spanner with Adap-
tor Pins 8346, tighten left (Fig. 137) and right (Fig.
138). camshaft sprocket bolts to 122 N´m (90 ft. lbs.).
Fig. 136 Installing Idler Gear, Primary and
Secondary Timing Chains
1 - SPECIAL TOOL 8515
2 - PRIMARY CHAIN IDLER SPROCKET
3 - CRANKSHAFT SPROCKET
Fig. 137 Tightening Left Side Camshaft Sprocket
Bolt
1 - TORQUE WRENCH
2 - CAMSHAFT SPROCKET
3 - LEFT CYLINDER HEAD
4 - SPECIAL TOOL 6958 SPANNER WITH ADAPTER PINS 8346
DRENGINE - 4.7L 9 - 177
TIMING BELT/CHAIN AND SPROCKETS (Continued)

(19) Rotate engine two full revolutions. Verify tim-
ing marks are at the follow locations:
²primary chain idler sprocket dot is at 12 o'clock
(Fig. 133)
²primary chain crankshaft sprocket dot is at 6
o'clock (Fig. 133)
²secondary chain camshaft sprockets ªV8º marks
are at 12 o'clock (Fig. 133)
(20) Lubricate all three chains with engine oil.
(21) After installing all chains, it is recommended
that the idler gear end play be checked (Fig. 139).
The end play must be within 0.10±0.25 mm (0.004±
0.010 in.). If not within specification, the idler gear
must be replaced.
(22) Install timing chain cover (Refer to 9 -
ENGINE/VALVE TIMING/TIMING BELT / CHAIN
COVER(S) - INSTALLATION) and crankshaft
damper (Refer to 9 - ENGINE/ENGINE BLOCK/VI-
BRATION DAMPER - INSTALLATION).
(23) Install cylinder head covers (Refer to 9 -
ENGINE/CYLINDER HEAD/CYLINDER HEAD
COVER(S) - INSTALLATION).NOTE: Before installing threaded plug in right cylin-
der head, the plug must be coated with sealant to
prevent leaks.
(24) Coat the large threaded access plug with
MopartThread Sealant with Teflon, then install
into the right cylinder head and tighten to 81 N´m
(60 ft. lbs.) (Fig. 128).
(25) Install the oil fill housing.
(26) Install access plug in left cylinder head (Fig.
128).
(27) Install power steering pump (Refer to 19 -
STEERING/PUMP - INSTALLATION).
(28) Install radiator fan shroud.
(29) Fill cooling system (Refer to 7 - COOLING -
STANDARD PROCEDURE).
(30) Connect negative cable to battery.
Fig. 138 Tightening Right Side Camshaft Sprocket
Bolt
1 - TORQUE WRENCH
2 - SPECIAL TOOL 6958 WITH ADAPTER PINS 8346
3 - LEFT CAMSHAFT SPROCKET
4 - RIGHT CAMSHAFT SPROCKETFig. 139 Measuring Idler Gear End Play
1 - IDLER SPROCKET ASSEMBLY
2 - DIAL INDICATOR
9 - 178 ENGINE - 4.7LDR
TIMING BELT/CHAIN AND SPROCKETS (Continued)

IDLER SHAFT
REMOVAL
(1) Remove the primary and secondary timing
chains and sprockets (Refer to 9 - ENGINE/VALVE
TIMING/TIMING BELT/CHAIN AND SPROCKETS -
REMOVAL).
NOTE: To remove the idler shaft, it is necessary to
tap threads into the shaft, to install the removal
tool.
(2) Using a 12 mm X 1.75 tap, cut threads in the
idler shaft center bore.
(3) Cover the radiator core with a suitable cover.
CAUTION: Use care when removing the idler shaft,
Do not strike the radiator cooling fins with the slide
hammer.
(4) Using Special Tool 8517 Slide Hammer, remove
the idler shaft.
INSTALLATION
(1) Thoroughly clean the idler shaft bore.
(2) Position the idler shaft in the bore.
NOTE: The two lubrication holes in the idler shaft
do not require any special alignment.
NOTE: Before using the retaining bolt to install the
idler shaft, coat the threads and the pilot on the
idler shaft, with clean engine oil.
(3) Using the primary idler sprocket retaining bolt
and washer, carefully draw the idler shaft into the
bore until fully seated.
(4) Coat the idler shaft with clean engine oil.
(5) Install the timing chains and sprockets (Refer
to 9 - ENGINE/VALVE TIMING/TIMING BELT/
CHAIN AND SPROCKETS - INSTALLATION).
DRENGINE - 4.7L 9 - 179

STANDARD PROCEDUREÐPISTON FITTING . 211
REMOVAL............................212
CLEANING...........................212
INSPECTION.........................213
INSTALLATION........................213
PISTON RINGS
STANDARD PROCEDURE - PISTON RING
FITTING............................213
VIBRATION DAMPER
REMOVAL............................215
INSTALLATION........................215
STRUCTURAL COVER
DESCRIPTION........................216
OPERATION..........................216
REMOVAL............................216
INSTALLATION........................216
FRONT MOUNT
REMOVAL............................217
INSTALLATION........................218
REAR MOUNT
REMOVAL............................220
INSTALLATION........................220
LUBRICATION
DESCRIPTION........................220
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - CHECKING
ENGINE OIL PRESSURE...............220
DIAGNOSIS AND TESTING - ENGINE OIL
LEAK..............................220
OIL
STANDARD PROCEDURE - ENGINE OIL
SERVICE...........................222
OIL FILTER
REMOVAL............................223INSTALLATION........................223
OIL PAN
REMOVAL............................224
INSTALLATION........................224
OIL PUMP
REMOVAL............................224
CLEANING...........................224
INSPECTION.........................224
INSTALLATION........................225
INTAKE MANIFOLD
DESCRIPTION........................225
DIAGNOSIS AND TESTING - INTAKE
MANIFOLD LEAKAGE.................225
REMOVAL............................226
CLEANING...........................226
INSPECTION.........................226
INSTALLATION........................226
EXHAUST MANIFOLD
DESCRIPTION........................226
OPERATION..........................226
REMOVAL............................226
CLEANING...........................226
INSPECTION.........................227
INSTALLATION........................227
TIMING/CHAIN COVER
REMOVAL............................227
INSTALLATION........................227
TIMING/CHAIN AND SPROCKETS
REMOVAL............................228
INSTALLATION........................228
TIMING CHAIN/TENSIONER
DESCRIPTION........................229
OPERATION..........................229
DRENGINE - 5.7L 9 - 181

CONDITION POSSIBLE CAUSE CORRECTION
ENGINE STALLS OR ROUGH IDLE 1. Idle speed set to low. 1. (Refer to 14 - FUEL SYSTEM/
FUEL INJECTION/IDLE AIR
CONTROL MOTOR - REMOVAL).
2. Idle mixture too lean or too rich. 2. Refer to Powertrain Diagnosis
Information.
3. Vacuum leak. 3. Inspect intake manifold and
vacuum hoses, repair or replace as
necessary.
4. Faulty coil. 4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION COIL
- REMOVAL).
5. Incorrect engine timing. 5. (Refer to 9 - ENGINE/VALVE
TIMING - STANDARD PROCEDURE).
1. ENGINE LOSS OF POWER 1. Dirty or incorrectly gapped spark
plugs.1. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG -
CLEANING).
2. Dirt or water in fuel system. 2. Clean system and replace fuel
filter.
3. Faulty fuel pump. 3. (Refer to 14 - FUEL SYSTEM/
FUEL DELIVERY/FUEL PUMP -
DIAGNOSIS AND TESTING).
4. Blown cylinder head gasket. 4. Replace cylinder head gasket.
5. Low compression. 5. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING).
6. Burned, warped or pitted valves. 6. Replace as necessary.
7. Plugged or restricted exhaust
system.7. Inspect and replace as necessary.
8. Faulty coil. 8. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION COIL
- REMOVAL).
1. ENGINE MISSES ON
ACCELERATION1. Spark plugs dirty or incorrectly
gapped.1. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG -
CLEANING).
2. Dirt in fuel system. 2. Clean fuel system.
3. Burned, warped or pitted valves. 3. Replcae as necessary.
4. Faulty coil. 4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION COIL
- REMOVAL).
1. ENGINE MISSES AT HIGH SPEED 1. Spark plugs dirty or incorrectly
gapped.1. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG -
CLEANING).
2. Faulty coil. 2. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION COIL
- REMOVAL).
3. Dirt or water in fuel system. 3. Clean system and replace fuel
filter.
9 - 184 ENGINE - 5.7LDR
ENGINE - 5.7L (Continued)

VALVE TIMING
DESCRIPTION SPECIFICATION
Intake
Opens (BTDC) 7.0É
Closes (ATDC) 253.0É
Exhaust
Opens (BTDC) 233É
Closes (ATDC) 27É
Duration 253.70É
Valve Overlap 34É
CYLINDER HEAD
DESCRIPTION SPECIFICATION
Valve Seat Angle 44.5É - 45.0É
Valve Seat Runout (MAX) 0.05 mm (0.0019 in.)
Valve Seat Width (Finish)
Intake 1.018 - 1.62 mm
(0.0464 - 0.0637 in.)
Exhaust 1.48 - 1.92 mm
(0.0582 - 0.0755 in.)
Guide Bore Diameter
(Std.)7.975 - 8.00 mm
(0.313 - 0.314 in.)
HYDRAULIC TAPPETS
DESCRIPTION SPECIFICATION
Metric Standard
Body Diameter 21.387 - 21.405
mm0.8420 - 0.8427
in.
Clearance (To
Bore)0.020 - 0.063
mm0.0007 - 0.0024
in.
Dry Lash 3.0 mm (at the
valve)0.1181 in.
VALVES
DESCRIPTION SPECIFICATION
Face Angle 45.0É - 45.5É
Head Diameter
Intake 50.67 - 50.93 mm
(1.99 - 2.00 in.)
Exhaust 39.27 - 39.53 mm
(1.54 - 1.55 in.)
Length (Overall)
Intake 123.38 - 123.76 mm
(4.857 - 4.872 in.)
Exhaust 120.475 - 120.855 mm
(4.743 - 4.758 in.)
Stem Diameter
Intake 7.935 - 7.953 mm
(0.312 - 0.313 in.)
Exhaust 7.905 - 7.925 mm
(0.311 - 0.312 in.)
Stem - to - Guide
Clearance
Intake 0.022 - 0.065 mm
(0.0008 - 0.0025 in.)
Exhaust 0.050 - 0.095 mm
(0.0019 - 0.0037 in.)
Valve Lift ( @ Zero Lash)
Intake 12.0 mm (0.472 in.)
Exhaust 11.70 mm (0.460 in.)
9 - 194 ENGINE - 5.7LDR
ENGINE - 5.7L (Continued)

VALVE SPRING
DESCRIPTION SPECIFICATION
Spring Force (Valve
Closed)
Intake and Exhaust 422.0 N @ 46.0 mm
(95lbs. @ 1.81 in.)
Spring Force (Valve
Open)
Intake and Exhaust @ 33.5 mm
Number of Coils
Intake and Exhaust 7.4
Wire Diameter
Intake and Exhaust 5.39 ý 4.52 mm
(0.212 - 0.177 in.)
Installed Height (Spring
Seat to Bottom of
Retainer)
Intake and Exhaust 46.0 mm (1.81 in.)
OIL PUMP
DESCRIPTION SPECIFICATION
Clearance Over Rotors
(MAX)0.095 mm (0.0038 in.)
Outer Rotor to Pump
Body Clearance (MAX).235 mm (.009 in.)
Tip Clearance Between
Rotors (MAX)0.150 mm (0.006 in.)
OIL PRESSURE
SPECIFICATION SPECIFICATION
At Curb Idle Speed
(MIN)*25 kPa (4 psi)
@ 3000 rpm 170 - 758 kPa (25 - 110
psi)
* CAUTION: If pressure is zero at curb idle, DO
NOT run engine
TORQUE
TORQUE CHART 5.7L ENGINE
DESCRIPTION N´m Ft. In.
Lbs. Lbs.
Block Pipe Plugs
(1/4 NPT)20 Ð 177
(3/8 NPT) 27 Ð 240
Camshaft SprocketÐBolt 122 90 Ð
Camshaft Tensioner
PlateÐBolts28 Ð 250
Timing Chain Case CoverÐ
Bolts28 Ð 250
Lifting Stud 55 40 Ð
Connecting Rod CapÐBolts 21
plus
90É
Turn15
plus
90É
TurnÐ
Main Bearing CapÐBolts
M-1227
plus
90É
TurnÐÐ
Crossbolts
M-828 Ð Ð
Cylinder HeadÐBolts
M-12 Bolts
Step 1 34 25 Ð
Step 2 54 40 Ð
Step 3 Turn
90ÉTurn
90ÉÐ
M-8 Bolts Ð
Step 1 20 15 Ð
Step 2 34 25 Ð
Cylinder Head CoverÐBolts 8 Ð 70
Exhaust Manifold to Cylinder
Head25 Ð 220
Flexplate to crankshaftÐBolts 95 70 Ð
Flywheel to crankshaftÐBolts 75 55 Ð
Front InsulatorÐThrough
bolt/nut95 70 Ð
Front Insulator to Support
Bracket
ÐStud Nut (4WD) 41 30 Ð
ÐThrough Bolt/Nut (4WD) 102 75 Ð
Front Insulator to BlockÐ
Bolts (2WD)95 70 Ð
DRENGINE - 5.7L 9 - 195
ENGINE - 5.7L (Continued)

DESCRIPTION N´m Ft. In.
Lbs. Lbs.
GeneratorÐMounting Bolt 55 40 Ð
Intake ManifoldÐBolts Refer to Procedure
Lifter Guide Holder 12 Ð 106
Oil Pan Bolts 12 - 105
Oil Dipstick Tube 12 Ð 105
Oil PanÐDrain Plug 34 25 Ð
Oil PumpÐAttaching Bolts 28 Ð 250
Oil Pump Pickup Tube ± Bolt
and Nut28 Ð 250
Rear Seal Retainer Attaching
Bolts15 Ð 132
Rear Insulator to BracketÐ 68 50 Ð
Through-Bolt (2WD)
Rear Insulator to
Crossmember41 30 Ð
Support BracketÐNut (2WD)
Rear Insulator to
CrossmemberÐ68 50 Ð
Nuts (4WD)
Rear Insulator to
TransmissionÐ68 50 Ð
Bolts (4WD)
Rear Insulator BracketÐBolts 68 50 Ð
(4WD Automatic)
Rear Support Bracket to 41 30 Ð
Crossmember FlangeÐNuts
Rear Support Plate to
Transfer41 30 Ð
CaseÐBolts
Rocker ArmÐBolts 22 Ð 195
Spark Plugs Ð Ð Ð
Thermostat HousingÐBolts 28 Ð 250
Throttle BodyÐBolts 12 Ð 105
Transfer Case to Insulator 204 105 Ð
Mounting PlateÐNuts
Transmission Support
BracketÐ68 50 Ð
Bolts (2WD)
Vibration DamperÐBolt 176 129 Ð
Water Pump to Timing Chain 28 Ð 250
Case CoverÐBoltsSPECIAL TOOLS
5.7L ENGINE
CRANKSHAFT DAMPER REMOVER INSERT - 8513-A
Bloc±Chek±Kit C-3685±A
Bore Size Indicator C-119
Puller 8454
Crankshaft Damper Installer 8512
9 - 196 ENGINE - 5.7LDR
ENGINE - 5.7L (Continued)