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Dodge Durango (HB). Manual - part 1018

ENGINE - 3.7L SERVICE INFORMATION

TABLE OF CONTENTS

page

page

ENGINE - 3.7L SERVICE INFORMATION

. . . . . . . . . . . . . . . . . . . . . . . 1073

DIAGNOSIS AND TESTING

ENGINE DIAGNOSIS - INTRODUCTION

ENGINE DIAGNOSIS - PERFORMANCE

ENGINE DIAGNOSIS - MECHANICAL

ENGINE DIAGNOSIS - LUBRICATION

CYLINDER COMPRESSION PRESSURE

CYLINDER COMBUSTION PRESSURE

LEAKAGE . . . . . . . . . . . . . . . . . . . . . . . . . . 1078

STANDARD PROCEDURE

REPAIR DAMAGED OR WORN THREADS

FORM-IN-PLACE GASKETS AND

SEALERS . . . . . . . . . . . . . . . . . . . . . . . . . . 1079

ENGINE GASKET SURFACE

PREPARATION . . . . . . . . . . . . . . . . . . . . . . 1080

REMOVAL - ENGINE

. . . . . . . . . . . . . . . . . . . 1081

INSTALLATION - ENGINE

. . . . . . . . . . . . . . . 1087

SPECIFICATIONS - 3.7L ENGINE

. . . . . . . . 1094

. . . . . . . . . . . . . . . . . . . . . . . . . . 1098

. . . . . . . . . . . . . . . . . . . . . . . 1100

CLEANER-AIR ELEMENT

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1104

. . . . . . . . . . . . . . . . . . . . . . . 1105

CYLINDER HEAD

. . . . . . . . . . . . . . . . . . . . 1105

VALVE GUIDE SEALS

. . . . . . . . . . . . . . . . 1105

DIAGNOSIS AND TESTING

CYLINDER HEAD GASKET

. . . . . . . . . . . . 1105

DIAGNOSIS AND TESTING - HYDRAULIC

LASH ADJUSTER . . . . . . . . . . . . . . . . . . . . 1106

CYLINDER HEAD - LEFT

. . . . . . . . . . . . . . 1107

CYLINDER HEAD - RIGHT

. . . . . . . . . . . . . 1109

. . . . . . . . . . . . . . . . . . . . . . . . . 1110

CYLINDER HEAD - LEFT

. . . . . . . . . . . . . . 1110

CYLINDER HEAD - RIGHT

. . . . . . . . . . . . . 1112

CAMSHAFT(S)

. . . . . . . . . . . . . . . . . . . . . . . . 1114

. . . . . . . . . . . . . . . . . . . . 1115

. . . . . . . . . . . . . . . . . . . 1116

INSTALLATION - LEFT

. . . . . . . . . . . . . . . . 1117

. . . . . . . . . . . . . . . . . . . 1118

COVER(S)-CYLINDER HEAD

. . . . . . . . . . . . . . . . . . . . . . . . 1119

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1119

. . . . . . . . . . . . . . . . . . . . . . . 1120

VALVES & SEATS - INTAKE/EXHAUST

. . . . . . . . . . . . . . . . . . . . . . . . 1120

STANDARD PROCEDURE

. . . . . . . . . . . . . . . . . . . . . . . . . 1120

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1121

. . . . . . . . . . . . . . . . . . . . . . . 1122

ARM-ROCKER

. . . . . . . . . . . . . . . . . . . . . . . . 1123

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1123

. . . . . . . . . . . . . . . . . . . . . . . 1124

SEALS-VALVE GUIDE

. . . . . . . . . . . . . . . . . . . . . . . . 1124

SPRINGS-VALVE

. . . . . . . . . . . . . . . . . . . . . . . . 1124

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1124

. . . . . . . . . . . . . . . . . . . . . . . 1125

ENGINE BLOCK

. . . . . . . . . . . . . . . . . . . . . . . . 1125

STANDARD PROCEDURE - CYLINDER BORE

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1126

. . . . . . . . . . . . . . . . . . . . . . . . . . 1126

. . . . . . . . . . . . . . . . . . . . . . . . . 1127

CRANKSHAFT

. . . . . . . . . . . . . . . . . . . . . . . . 1128

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1129

. . . . . . . . . . . . . . . . . . . . . . . . . 1130

. . . . . . . . . . . . . . . . . . . . . . . 1130

BEARINGS-CRANKSHAFT MAIN

STANDARD PROCEDURE

MAIN BEARING FITTING

. . . . . . . . . . . . . . 1132

SEAL-CRANKSHAFT OIL - FRONT

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1134

. . . . . . . . . . . . . . . . . . . . . . . 1135

CRANKSHAFT OIL SEAL - REAR

DIAGNOSIS AND TESTING - REAR SEAL

. . . . . . . . . . . . . . . . . . . . . . . 1135

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1136

. . . . . . . . . . . . . . . . . . . . . . . 1136

FLEX PLATE

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1137

. . . . . . . . . . . . . . . . . . . . . . . 1138

ROD-PISTON & CONNECTING

. . . . . . . . . . . . . . . . . . . . . . . . 1138

STANDARD PROCEDURE

CONNECTING ROD BEARING FITTING

. . . . . . . . . . . . . . . . . . . . 1142

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1142

. . . . . . . . . . . . . . . . . . . . . . . . . . 1143

. . . . . . . . . . . . . . . . . . . . . . . . . 1143

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ENGINE - 3.7L SERVICE INFORMATION

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. . . . . . . . . . . . . . . . . . . . . . . 1144

RINGS-PISTON

STANDARD PROCEDURE

PISTON RING FITTING

. . . . . . . . . . . . . . . 1145

DAMPER-CRANKSHAFT

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1148

. . . . . . . . . . . . . . . . . . . . . . . 1148

COVER-STRUCTURAL

. . . . . . . . . . . . . . . . . . . . . . . . 1149

. . . . . . . . . . . . . . . . . . . . . . . . . 1149

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1149

. . . . . . . . . . . . . . . . . . . . . . . 1150

MOUNT-ENGINE FRONT

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1150

. . . . . . . . . . . . . . . . . . . . . . . 1152

MOUNT-ENGINE REAR

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1154

. . . . . . . . . . . . . . . . . . . . . . . 1154

LUBRICATION

. . . . . . . . . . . . . . . . . . . . . . . . 1154

. . . . . . . . . . . . . . . . . . . . . . . . . 1155

DIAGNOSIS AND TESTING

ENGINE OIL LEAK

. . . . . . . . . . . . . . . . . . . 1157

CHECKING ENGINE OIL PRESSURE

REAR SEAL AREA LEAKS

. . . . . . . . . . . . . 1158

PAN-ENGINE OIL

. . . . . . . . . . . . . . . . . . . . . . . . 1159

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1159

. . . . . . . . . . . . . . . . . . . . . . . . . . 1160

. . . . . . . . . . . . . . . . . . . . . . . . . 1160

. . . . . . . . . . . . . . . . . . . . . . . 1161

SENSOR/SWITCH-OIL PRESSURE

. . . . . . . . . . . . . . . . . . . . . . . . 1161

. . . . . . . . . . . . . . . . . . . . . . . . . 1161

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1162

. . . . . . . . . . . . . . . . . . . . . . . 1162

PUMP-ENGINE OIL

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1162

. . . . . . . . . . . . . . . . . . . . . . . 1162

. . . . . . . . . . . . . . . . . . . . . . . . . 1163

. . . . . . . . . . . . . . . . . . . . . . . . . . 1165

. . . . . . . . . . . . . . . . . . . . . . . 1165

FILTER-ENGINE OIL

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1166

. . . . . . . . . . . . . . . . . . . . . . . 1166

OIL

STANDARD PROCEDURE

ENGINE OIL SERVICE

. . . . . . . . . . . . . . . . 1167

MANIFOLD-INTAKE

. . . . . . . . . . . . . . . . . . . . . . . . 1168

DIAGNOSIS AND TESTING

INTAKE MANIFOLD LEAKS

. . . . . . . . . . . . 1168

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1169

. . . . . . . . . . . . . . . . . . . . . . . 1170

MANIFOLD-EXHAUST

. . . . . . . . . . . . . . . . . . . . . . . . 1171

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1172

. . . . . . . . . . . . . . . . . . . . . . . 1172

VALVE TIMING

. . . . . . . . . . . . . . . . . . . . . . . . 1174

. . . . . . . . . . . . . . . . . . . . . . . . . 1174

STANDARD PROCEDURE

MEASURING TIMING CHAIN WEAR

. . . . . . 1175

SERVICE PROCEDURE - TIMING

VERIFICATION . . . . . . . . . . . . . . . . . . . . . . 1175

SHAFT-BALANCE

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1179

. . . . . . . . . . . . . . . . . . . . . . . 1180

IDLER SHAFT

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1180

. . . . . . . . . . . . . . . . . . . . . . . 1181

COVER - TIMING

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1181

. . . . . . . . . . . . . . . . . . . . . . . 1182

TIMING CHAIN & SPROCKETS

. . . . . . . . . . . . . . . . . . . . . . . . . . . 1183

. . . . . . . . . . . . . . . . . . . . . . . . . 1185

. . . . . . . . . . . . . . . . . . . . . . . 1186

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ENGINE - 3.7L SERVICE INFORMATION

HB

ENGINE - 3.7L SERVICE INFORMATION

DESCRIPTION

The 3.7 liter (226 CID) six-cylinder engine is an 90° single overhead camshaft engine. The cast iron cylinder block
is made up of two different components; the first component is the cylinder bore and upper block, the second com-
ponent is the bedplate that comprises the lower portion of the cylinder block and houses the lower half of the crank-
shaft main bearings. The cylinders are numbered from front to rear with the left bank being numbered 1,3, and 5
and the right bank being numbered 2,4, and 6. The firing order is 1–6–5–4–3–2. The engine serial number is
located at the right front side of the engine block

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ENGINE - 3.7L SERVICE INFORMATION

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DIAGNOSIS AND TESTING

ENGINE DIAGNOSIS - INTRODUCTION

Engine diagnosis is helpful in determining the causes of malfunctions not detected and remedied by routine main-
tenance.

These malfunctions may be classified as either performance (e.g., engine idles rough and stalls) or mechanical
(e.g., a strange noise).

(Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) - PERFORMANCE and (Refer to 9 - ENGINE - DIAGNOSIS
AND TESTING) - MECHANICAL for possible causes and corrections of malfunctions. Refer to 14 - FUEL SYSTEM
for the fuel system diagnosis.

Additional tests and diagnostic procedures may be necessary for specific engine malfunctions that can not be iso-
lated with the Service Diagnosis charts. Information concerning additional tests and diagnosis is provided within the
following diagnosis:

•

Cylinder Compression Pressure Test (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)

•

Cylinder Combustion Pressure Leakage Test (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).

•

Engine Cylinder Head Gasket Failure Diagnosis (Refer to 9 - ENGINE/CYLINDER HEAD - DIAGNOSIS AND
TESTING).

•

Intake Manifold Leakage Diagnosis (Refer to 9 - ENGINE/MANIFOLDS/INTAKE MANIFOLD - 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.

9 - 1074

ENGINE - 3.7L SERVICE INFORMATION

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