2003 DODGE RAM Service Repair Manual

oil viscosity airbag off remove seats brake fluid coolant fuse diagram

Page 1249 of 2895

DODGE RAM 2003 Service Repair Manual no continuity between terminals 87 and 30. If OK, go
to Step 3. If not OK, replace the faulty relay.
(3) Resistance between terminals 85 and 86 (elec-
tromagnet) should be 67.5 - 82.5 ohms. If OK, go

Page 1250 of 2895

DODGE RAM 2003 Service Repair Manual ENGINE
TABLE OF CONTENTS
page page
ENGINE - 3.7L............................ 1
ENGINE - 4.7L........................... 87
ENGINE - 5.7L.......................... 176ENGINE - 5.9L.....................

ENGINE
TABLE OF CONTENTS
page page
ENGINE - 3.7L............................ 1
ENGINE - 4.7L........................... 87
ENGINE - 5.7L.......................... 176ENGINE - 5.9L.......................... 223
ENGINE 5.9L DIESEL..................... 280
ENGINE 8.0L............................ 351
ENGINE - 3.7L
TABLE OF CONTENTS
page page
ENGINE - 3.7L
DESCRIPTION..........................3
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION............4
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - PERFORMANCE............4
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - MECHANICAL..............6
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - LUBRICATION..............7
DIAGNOSIS AND TESTING - CYLINDER
COMPRESSION PRESSURE..............8
DIAGNOSIS AND TESTING - CYLINDER
COMBUSTION PRESSURE LEAKAGE.......8
STANDARD PROCEDURE
STANDARD PROCEDURE - REPAIR
DAMAGED OR WORN THREADS..........9
STANDARD PROCEDURE - FORM-IN-
PLACE GASKETS AND SEALERS..........9
STANDARD PROCEDURE - ENGINE
GASKET SURFACE PREPARATION........10
REMOVAL.............................10
INSTALLATION.........................11
SPECIFICATIONS
SPECIFICATIONS ± 3.7L ENGINE.........12
TORQUE............................15
SPECIAL TOOLS.......................16
AIR CLEANER ELEMENT
REMOVAL.............................20
INSTALLATION.........................20
CYLINDER HEAD - LEFT
DIAGNOSIS AND TESTING - CYLINDER HEAD
GASKET............................20
REMOVAL.............................21
INSTALLATION.........................23CAMSHAFT(S)
DESCRIPTION.........................24
REMOVAL.............................24
INSTALLATION.........................25
CYLINDER HEAD COVER(S)
DESCRIPTION.........................26
REMOVAL.............................26
INSTALLATION.........................27
INTAKE/EXHAUST VALVES & SEATS
DESCRIPTION.........................27
STANDARD PROCEDURE - REFACING......27
REMOVAL.............................28
INSTALLATION.........................29
ROCKER ARM
DESCRIPTION.........................30
REMOVAL.............................30
INSTALLATION.........................30
VALVE GUIDE SEALS
DESCRIPTION.........................31
VALVE SPRINGS
DESCRIPTION.........................31
REMOVAL.............................31
INSTALLATION.........................31
CYLINDER HEAD - RIGHT
DIAGNOSIS AND TESTING - HYDRAULIC
LASH ADJUSTER.....................31
REMOVAL.............................32
INSTALLATION.........................32
CAMSHAFT(S)
DESCRIPTION.........................34
REMOVAL.............................34
INSTALLATION.........................35
CYLINDER HEAD COVER(S)
REMOVAL.............................35
INSTALLATION.........................36
DRENGINE 9 - 1

Page 1251 of 2895

DODGE RAM 2003 Service Repair Manual ROCKER ARM
DESCRIPTION.........................36
REMOVAL.............................36
VALVE GUIDE SEALS
DESCRIPTION.........................36
VALVE SPRINGS
DESCRIPTION.........................36
R

ROCKER ARM
DESCRIPTION.........................36
REMOVAL.............................36
VALVE GUIDE SEALS
DESCRIPTION.........................36
VALVE SPRINGS
DESCRIPTION.........................36
REMOVAL.............................37
INSTALLATION.........................37
ENGINE BLOCK
DESCRIPTION.........................37
STANDARD PROCEDUREÐCYLINDER BORE
HONING............................37
CLEANING............................38
INSPECTION..........................38
CRANKSHAFT
DESCRIPTION.........................39
REMOVAL.............................39
INSPECTION..........................40
INSTALLATION.........................41
CRANKSHAFT MAIN BEARINGS
STANDARD PROCEDURE
MAIN BEARING FITTING................43
CRANKSHAFT OIL SEAL - FRONT
REMOVAL.............................44
INSTALLATION.........................45
CRANKSHAFT OIL SEAL - REAR
REMOVAL.............................45
INSTALLATION.........................46
FLEX PLATE
REMOVAL.............................47
INSTALLATION.........................47
PISTON & CONNECTING ROD
DESCRIPTION.........................47
STANDARD PROCEDURE
CONNECTING ROD BEARING FITTING....48
STANDARD PROCEDUREÐPISTON
FITTING.............................50
REMOVAL.............................50
CLEANING............................51
INSPECTION..........................51
INSTALLATION.........................51
PISTON RINGS
STANDARD PROCEDURE - PISTON RING
FITTING.............................52
VIBRATION DAMPER
REMOVAL.............................54
INSTALLATION.........................55
STRUCTURAL COVER
DESCRIPTION.........................56
OPERATION...........................56
REMOVAL.............................56
INSTALLATION.........................56
FRONT MOUNT
REMOVAL.............................57
INSTALLATION.........................58REAR MOUNT
REMOVAL.............................60
INSTALLATION.........................60
LUBRICATION
DESCRIPTION.........................60
OPERATION...........................60
DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTINGÐENGINE OIL
LEAK...............................63
DIAGNOSIS AND TESTING - CHECKING
ENGINE OIL PRESSURE................64
DIAGNOSIS AND TESTING - REAR SEAL
AREA LEAKS.........................64
OIL PAN
DESCRIPTION.........................65
REMOVAL.............................65
CLEANING............................65
INSPECTION..........................66
INSTALLATION.........................66
OIL PRESSURE SENSOR/SWITCH
DESCRIPTION.........................66
OPERATION...........................66
REMOVAL.............................67
INSTALLATION.........................67
OIL PUMP
REMOVAL.............................67
DISASSEMBLY.........................67
INSPECTION..........................67
ASSEMBLY............................68
INSTALLATION.........................68
OIL FILTER
REMOVAL.............................69
INSTALLATION.........................70
OIL
STANDARD PROCEDURE - ENGINE OIL
SERVICE............................70
INTAKE MANIFOLD
DESCRIPTION.........................71
DIAGNOSIS AND TESTING - INTAKE
MANIFOLD LEAKS.....................71
REMOVAL.............................72
INSTALLATION.........................72
EXHAUST MANIFOLD
DESCRIPTION.........................73
REMOVAL.............................73
INSTALLATION.........................74
VALVE TIMING
DESCRIPTION.........................75
OPERATION...........................75
STANDARD PROCEDURE
MEASURING TIMING CHAIN WEAR.......76
SERVICE PROCEDURE - TIMING
VERIFICATION........................76
BALANCE SHAFT
REMOVAL.............................79
INSTALLATION.........................79
9 - 2 ENGINE - 3.7LDR

Page 1252 of 2895

DODGE RAM 2003 Service Repair Manual IDLER SHAFT
REMOVAL.............................79
INSTALLATION.........................80
TIMING BELT / CHAIN COVER(S)
REMOVAL.............................80INSTALLATION.........................81
TI

Page 1253 of 2895

DODGE RAM 2003 Service Repair Manual DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION
Engine diagnosis is helpful in determining the
causes of malfunctions not detected and remedied by
routine maintenance.
Th

DIAGNOSIS AND TESTING
DIAGNOSIS AND TESTING - ENGINE
DIAGNOSIS - INTRODUCTION
Engine diagnosis is helpful in determining the
causes of malfunctions not detected and remedied by
routine maintenance.
These malfunctions may be classified as either per-
formance (e.g., engine idles rough and stalls) or
mechanical (e.g., a strange noise).
(Refer to 9 - ENGINE - DIAGNOSIS AND TEST-
ING)ÐPERFORMANCE and (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)ÐMECHANICAL for
possible causes and corrections of malfunctions.
(Refer to 14 - FUEL SYSTEM/FUEL DELIVERY -
DIAGNOSIS AND TESTING) and (Refer to 14 -
FUEL SYSTEM/FUEL INJECTION - DIAGNOSIS
AND TESTING) for the fuel system diagnosis.Additional tests and diagnostic procedures may be
necessary for specific engine malfunctions that can
not be isolated with the Service Diagnosis charts.
Information concerning additional tests and diagno-
sis is provided within the following diagnosis:
²Cylinder Compression Pressure Test (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING).
²Cylinder Combustion Pressure Leakage Test
(Refer to 9 - ENGINE - DIAGNOSIS AND TEST-
ING).
²Engine Cylinder Head Gasket Failure Diagnosis
(Refer to 9 - ENGINE/CYLINDER HEAD - DIAGNO-
SIS AND TESTING).
²Intake Manifold Leakage Diagnosis (Refer to 9 -
ENGINE/MANIFOLDS/INTAKE MANIFOLD -
DIAGNOSIS AND TESTING).
DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - PERFORMANCE
CONDITION POSSIBLE CAUSE CORRECTION
ENGINE WILL NOT START 1. Weak battery 1. Charge or replace as necessary.
2. Corroded or loose battery
connections.2. Clean and tighten battery
connections. Apply a coat of light
mineral grease to the terminals.
3. Faulty starter. 3. (Refer to 8 - ELECTRICAL/
STARTING - DIAGNOSIS AND
TESTING).
4. Faulty coil or control unit. 4. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
5. Incorrect spark plug gap. 5. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/SPARK PLUG
- CLEANING).
6. Incorrect right bank cam timing. 6. Refer to engine timing in this
section.
7. Dirt or water in fuel system. 7. Clean system and replace fuel
filter.
8.Faulty fuel pump, relay or wiring. 8.Repair or replace as necessary.
9. Faulty cam or crank sensor 9. Refer to Ignition system.
ENGINE STALLS OR ROUGH IDLE 1. Vacuum leak. 1. Inspect intake manifold and
vacuum hoses, repair or replace as
necessary.
2. Faulty crank position sensor 2. Replace crank position sensor.
3. Faulty coil. 3. (Refer to 8 - ELECTRICAL/
IGNITION CONTROL/IGNITION
COIL - REMOVAL).
9 - 4 ENGINE - 3.7LDR
ENGINE - 3.7L (Continued)

Page 1254 of 2895

DODGE RAM 2003 Service Repair Manual CONDITION POSSIBLE CAUSE CORRECTION
4. Incorrect cam timing. 4. (Refer to 9 - ENGINE/VALVE
TIMING - STANDARD
PROCEDURE).
1. ENGINE LOSS OF POWER 1. Dirty or incorrectly gapped spark
plugs.1. (Refer to

Page 1255 of 2895

DODGE RAM 2003 Service Repair Manual DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - MECHANICAL
CONDITION POSSIBLE CAUSES CORRECTIONS
NOISY VALVES 1. High or low oil level in
crankcase.1. (Refer to LUBRICATION &
MAINTENANCE -
SPECIFICATIONS)

Page 1256 of 2895

DODGE RAM 2003 Service Repair Manual DIAGNOSIS AND TESTING - ENGINE DIAGNOSIS - LUBRICATION
CONDITION POSSIBLE CAUSES CORRECTION
OIL LEAKS 1. Gaskets and O-Rings. 1.
(a) Misaligned or damaged. (a) Replace as necessary.
(b) Loose fastener

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