MACK ASET AC Service Manual

ASET™ AC DIESEL ENGINE

SERVICE MANUAL

for Engines with Exhaust Gas Recirculation (EGR)

OCTOBER 2006 (REVISED)

5-111

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5-111.bk Page i Monday, July 10, 2006 2:26 PM

ASET™ AC ENGINE SERVICE

MANUAL

View of ASET™ AC Engine

OCTOBER 2006				© MACK TRUCKS, INC. 2006
(REVISED — SUPERSEDES ISSUE DATED JANUARY 2005)				ENGINE 5-111

5-111.bk Page ii Monday, July 10, 2006 2:26 PM

ATTENTION

The information in this manual is not all inclusive and cannot take into account all unique situations. Note that some illustrations are typical and may not reflect the exact arrangement of every component installed on a specific chassis.

The information, specifications, and illustrations in this publication are based on information that was current at the time of publication.

No part of this publication may be reproduced, stored in a retrieval system, or be transmitted in any form by any means including (but not limited to) electronic, mechanical, photocopying, recording, or otherwise without prior written permission of Mack Trucks, Inc.

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TABLE OF CONTENTS

TABLE OF CONTENTS

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TABLE OF CONTENTS

INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SAFETY INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Advisory Labels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 Service Procedures and Tool Usage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 EXPLANATION OF NUMERICAL CODE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 CONVERSION CHART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 ABOUT THE MACK ASET™ AC DIESEL ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Heater Core and Optional Fuel Heater Hose Connection Revisions . . . . . . . . . . . . . . . . . . . . . . 9

VISUAL IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

ENGINE MODEL IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Engine Information Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Engine Serial Number Identification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

DESCRIPTION AND OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

ENGINE DESIGN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

ASET™ AC Engine Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

ASET™ AC (CEGR) Engine Features and Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

MACK Fuel Filtration System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41

Electronic Unit Pumps (EUP) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42

Engine Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

Camshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Valve Train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53

Low-Pressure Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

High-Pressure Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

High-Pressure Fuel Injection Lines . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Fuel Injector Assemblies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Cylinder Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65

Crankshaft . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Block Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Cylinder Head . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

Cylinder Head Gasket . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

Gear Train . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Air Compressor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Power Steering Pump . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Vibration Damper Hub . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71

Front Cover . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Lubrication System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

GLOSSARY OF TERMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80

COMPONENT LOCATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83 COMPONENT LOCATION VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84 ASET™ AC Engine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 84

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

ENGINE SYMPTOM DIAGNOSIS FOR MACK ASET™ ENGINES . . . . . . . . . . . . . . . . . . . . . . . . 88

V-MAC III Diagnostics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 88

CAMSHAFT TIMING AND LOBE LIFT CHECKS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Camshaft Timing Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

Camshaft Lobe Lift Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99

CHASSIS-MOUNTED CHARGE AIR COOLING TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Special Tool Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

CMCAC Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

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TABLE OF CONTENTS

CMCAC Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101 Restriction Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102 Core Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 CMCAC Preventive Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103 CYLINDER HEAD AND CYLINDER BLOCK LEAK TEST PROCEDURE . . . . . . . . . . . . . . . . . . 104 Cylinder Head and Head Gasket Check — In Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104 Cylinder Head Fuel Passages Leak Check — In Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105 Cylinder Block/Cylinder Head Coolant Passages Leak Check — In Chassis . . . . . . . . . . . . . 105 Cylinder Head Oil Passage Leak Check — Out of Chassis . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 Cylinder Head Coolant Passage Leak Check — Out of Chassis . . . . . . . . . . . . . . . . . . . . . . . 108 Cylinder Block Coolant Passage Leak Check — Out of Chassis . . . . . . . . . . . . . . . . . . . . . . . 109 ENGINE BRAKE TESTS (MACK POWERLEASH™) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 Operational Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111 Electrical Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112 MACK PowerLeash™ Checks (Hydraulic/Mechanical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113 MACK PowerLeash™ Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115 Removal and Inspection of MACK PowerLeash™ Engine Brake Components . . . . . . . . . . . . 117 ENGINE BRAKE TESTS (J-TECH™) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 Operational Tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119 Electrical Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 J-Tech™ Checks (Hydraulic/Mechanical) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121 J-Tech™ Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127 LUBRICATION SYSTEM MAINTENANCE FOR ASET™ ENGINES . . . . . . . . . . . . . . . . . . . . . . 128 Crankcase Breather Element Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128 Oil Level Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129 Oil and Filter Change Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130 FUEL FILTER ELEMENT REPLACEMENT FOR ASET™ AC ENGINES . . . . . . . . . . . . . . . . . . . 134 Primary/Secondary Fuel Filter Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134 COOLANT CONDITIONER ELEMENT REPLACEMENT FOR ASET™ ENGINES . . . . . . . . . . . 137 Coolant Conditioner Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 OIL COALESCING AIR FILTER REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137 DRIVE BELT REPLACEMENT AND TENSIONING FOR ASET™ AC ENGINES . . . . . . . . . . . . 138 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138 Automatically Tensioned System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

REPAIR INSTRUCTIONS, PART 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141 ENGINE REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 Removal from Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 142 ENGINE DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Filter Element Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145 Dipstick Tube Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146 Oil Cooler and Oil Filter Mounting Bracket Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . 146 Oil Coalescing Air Filter Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 147 Mounting Engine in Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148 Alternator Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150 Engine Electronic Control Unit (EECU) and Cooling Plate Removal . . . . . . . . . . . . . . . . . . . . 150 EGR Gas Tube Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152 EGR Cooler Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 154

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EGR Mixer Tube Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Thermostat Housing Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Oil Supply Lines Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

EGR Valve Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Water Pump Housing Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160

VTG Position Control Valve Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

Coolant Manifold Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Air Inlet Manifold Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Turbocharger Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163

Fuel Nozzle Inlet Tube Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

Exhaust Manifold Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Engine Wiring Harness Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 165

Electronic Unit Pump (EUP) Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 166

Air Compressor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Cylinder Head Cover and Spacer Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169

Rocker Arm, Valve Yoke and Push Rod Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 170

Revised Rocker Arm Shift Mounting Bolts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Nozzle Holder Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

Cylinder Head Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 173

Vibration Damper and Crankshaft Hub Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Oil Pan Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Oil Pump Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 177

Front Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Auxiliary Shaft Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Camshaft Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Piston and Connecting Rod Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180

Flywheel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Flywheel Housing Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Main Bearing Cap Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 183

Crankshaft Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

CYLINDER BLOCK RECONDITIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Special Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Piston Cooling Spray Nozzle Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Cylinder Sleeve Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Cleaning and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187

Cylinder Sleeve Counterbore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Cup Plug Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

Pipe Plug Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 194

H-Ring Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195

Camshaft Bushing Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 197

Auxiliary Shaft Bushing Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 201

Cylinder Sleeve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

Piston Cooling Spray Nozzle Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Cylinder Block Dowel Pin Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211

CRANKSHAFT AND FLYWHEEL BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

Crankshaft Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

Crankshaft Dowel Pin Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 213

Crankshaft Gear Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214

Crankshaft Wear Ring Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215

Flywheel Inspection and Resurfacing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

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AUXILIARY SHAFT AND CAMSHAFT BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . 219 Auxiliary Shaft Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 Camshaft Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219 CONNECTING ROD AND PISTON BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 Connecting Rod Inspection and Reconditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223 Piston Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226 Piston Ring Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226 Assembling Connecting Rod to Piston . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229 CYLINDER HEAD OVERHAUL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 Special Tools Required . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 Inlet and Exhaust Valve Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 230 Cylinder Head Cleaning and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234 Fire Ring Groove Cutting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235 Valve Guide Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 238 Valve Seat Insert Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241 Valve Spring Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 247 Injection Nozzle Holder Insert Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248 Valve Yoke Guide Pin Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250 Cylinder Head Cup Plug Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251 Cylinder Head Pipe Plug Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252 Inlet and Exhaust Valve Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253 Inlet and Exhaust Valve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254 VALVE ROCKER ARM SHAFT BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 Rocker Arms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 260 Valve Rocker Arm Shaft Disassembly (with/without Engine Brake) . . . . . . . . . . . . . . . . . . . . . 262 Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 263 Valve Rocker Arm Shaft Reassembly (without Engine Brake) . . . . . . . . . . . . . . . . . . . . . . . . . 264 Valve Rocker Arm Shaft Reassembly (with J-Tech™ Engine Brake) . . . . . . . . . . . . . . . . . . . 266 Valve Rocker Arm Shaft Reassembly (with MACK PowerLeash™ Engine Brake) . . . . . . . . . 268 LUBRICATION SYSTEM BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273 Oil Cooler Assembly Reconditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273 Oil Pump Reconditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273 COOLING SYSTEM COMPONENTS BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . 279 Oil Cooler Reconditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 EGR Cooler Reconditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 Water Pump Reconditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279 FUEL SYSTEM COMPONENT BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280 Electronic Unit Pump (EUP) Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 280 Installation of Electronic Unit Pump Plunger Spring and Seat . . . . . . . . . . . . . . . . . . . . . . . . . 280 Fuel Injector Nozzle Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 283 VTG SYSTEM BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284 VTG Control Valve Solenoid Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284 ENGINE REASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286 General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286 Crankshaft Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 286 Main Bearing Cap Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 287 Piston and Connecting Rod Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293 Flywheel Housing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 298 Crankshaft Rear Oil Seal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 301 Flywheel Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 304 Valve Lifter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 305

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Camshaft Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	307
Camshaft Core Plug Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	308
Camshaft Idler Gear Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	308
Auxiliary Shaft Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	309
Oil Pump Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	310
Front Cover Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	311
Crankshaft Front Seal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	312
Crankshaft Hub Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	313
Vibration Damper Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	313
Oil Pan Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	314
Cylinder Head Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	316
Exhaust Manifold Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	319
Nozzle Holder Assembly Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	320
Push Rod Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	323
Valve Yoke Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	324
Rocker Arm and Engine Brake Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	328
Cylinder Head Cover and Spacer Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	334
Oil Fill Tube/Dipstick Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	336
Air Compressor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	336
Electronic Unit Pump (EUP) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	338
Engine Wiring Harness Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	339
Fuel Nozzle Inlet Tube Assembly Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	339
Turbocharger Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	342
Coolant Manifold Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	343
Air Inlet Manifold Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	344
VTG Position Control Valve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	344
Water Pump Housing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	345
EGR Valve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	348
Oil Supply Lines Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	350
Thermostat Housing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	353
EGR Mixer Tube Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	356
EGR Cooler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	357
EGR Gas Tube Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	358
EECU and Cooling Plate Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	360
Coolant Conditioner Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	362
Alternator Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	363
Removing Engine from Engine Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	363
Oil Coalescing Air Filter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	364
Oil Cooler and Oil Filter Mounting Bracket Assembly Installation . . . . . . . . . . . . . . . . . . . . . .	364
Dipstick Tube Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	366
ENGINE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	366
General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	366
Engine Installation into Vehicle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .	366

REPAIR INSTRUCTIONS, PART 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 371

IN-CHASSIS PART/COMPONENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

ELECTRONIC UNIT PUMP REPLACEMENT (IN-CHASSIS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

Unit Pump Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 372

Tappet Guide Pin and Tappet Bore Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373

Salvaging a Damaged EUP Tappet Bore . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 373

Tappet Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374

Unit Pump Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 374

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CAMSHAFT REPLACEMENT (IN-CHASSIS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 Camshaft/Lifter Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 376 Cleaning and Inspection of Cylinder Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 378 Camshaft Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379 Camshaft Idler Gear Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 380

EXHAUST VALVE YOKE PIN AND VALVE ROTATOR INSPECTION AND REPLACEMENT CRITERIA (IN-CHASSIS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 382 VALVE LIFTER H-RING DISLODGEMENT AND ALIGNMENT INSPECTIONS

(IN-CHASSIS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 384 H-Ring Dislodgement Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385 H-Ring Alignment Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 385 H-Ring Dislodgement Check and Alignment Verification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 386 EECU AND SENSOR SERVICE PROCEDURES (IN-CHASSIS) . . . . . . . . . . . . . . . . . . . . . . . . . 387 Engine Electronic Control Unit (EECU) and Cooling Plate Removal . . . . . . . . . . . . . . . . . . . . 387 EECU and Cooling Plate Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 389 Sensors Installation and Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 390 COOLING SYSTEM SERVICE PROCEDURES (IN-CHASSIS) . . . . . . . . . . . . . . . . . . . . . . . . . . 391 Thermostat Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 391 Water Pump Housing Assembly Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 396 Coolant Conditioner Adapter Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 401 EGR SYSTEM SERVICE PROCEDURES (IN-CHASSIS) FOR ASET™ AC ENGINE . . . . . . . . . 402 Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402 EGR Gas Tube(s) Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 402 EGR Cooler Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 408 EGR Valve Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 412 EGR Valve Heat Shields Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 416 EGR Gas Mixer Tube Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 417 MASS Flow System Replacement Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 420 Final Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 421 VTG TURBOCHARGER SERVICE PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422 Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422 VTG Position Control Valve Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 422 Turbocharger Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 424 Turbocharger Installation (Includes Pre-Lubing Procedures) . . . . . . . . . . . . . . . . . . . . . . . . . . 426 VTG Actuator Removal and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 428 VTG Actuating System Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 435 Turbocharger Wheel Speed Sensor Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 439

REPAIR INSTRUCTIONS, PART 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 441

ENGINE SETUP AND ADJUSTMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442

Fuel Injection Timing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442

Valve Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 442

Valve Adjustment Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 443

Electronic Unit Pump (EUP) Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 460

ENGINE SPEED AND POSITION SENSORS INSTALLATION AND ADJUSTMENT . . . . . . . . . 460

Engine Speed Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 460

Engine Position Sensor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461

Other Engine-Mounted Sensors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 461

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TABLE OF CONTENTS

ENGINE FINAL PREPARATION AND OPERATIONAL CHECK . . . . . . . . . . . . . . . . . . . . . . . . . 462

Filter Element Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462

Engine Lubrication System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 462

Turbocharger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463

Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 463

Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 464

Engine Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465

REBUILT ENGINE RUN-IN PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465

General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465

Run-In Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 465

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 467 ASET™ AC ENGINE MECHANICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468 Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 468 Material and Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469 Engine Component Torque Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 478 SPECIFICATION FOOTNOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 488 ASET™ ENGINE ASSEMBLY LUBRICANTS AND SEALANTS . . . . . . . . . . . . . . . . . . . . . . . . . . 490 ASET™ AC ENGINE DRIVE BELT SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 491

SCHEMATIC & ROUTING DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 493

ASET™ AC ENGINE SYSTEMS SCHEMATICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494

Cooling System Flow Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 494

Lubrication System Flow Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 495

Fuel System Flow Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 496

Accessory Drive Belt Routings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 499

SPECIAL TOOLS & EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 501 ASET™ ENGINE SPECIAL TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 502 Special Tools for Engine Overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 502 V-MAC III Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 505

APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 507 FASTENER IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508 Fastener Selection and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 508 Fastener Sizes and Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 509 TORQUE WRENCH USE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510 Using an Adapter in Combination with a Torque Wrench . . . . . . . . . . . . . . . . . . . . . . . . . . . . 510 TURBOCHARGER FAILURE AND ACTIONS REQUIRED TO AVOID REPEAT FAILURE . . . . . 511 Cleaning Oil from the Charge Air Cooler . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512 Cleaning the Intake Air System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 512

Cleaning the Turbocharger Oil Supply Line, Changing the Engine Oil and Pre-Lubricating

the Turbocharger Following a Failure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 513 Pre-Lubricating a Turbocharger After Sitting Idle for an Extended Period of Time . . . . . . . . . 514

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515

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INTRODUCTION

INTRODUCTION

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INTRODUCTION

SAFETY INFORMATION

Advisory Labels

Cautionary signal words (Danger-Warning-Caution) may appear in various locations throughout this manual. Information accented by one of these signal words must be observed to minimize the risk of personal injury to service personnel, or the possibility of improper service methods which may damage the vehicle or cause it to be unsafe. Additional Notes and Service Hints are used to emphasize areas of procedural importance and provide suggestions for ease of repair. The following definitions indicate the use of these advisory labels as they appear throughout the manual:

Danger indicates an unsafe practice that could result in death or serious personal injury. Serious personal injury is considered to be permanent injury from which full recovery is NOT expected, resulting in a change in life style.

Warning indicates an unsafe practice that could result in personal injury. Personal injury means that the injury is of a temporary nature and that full recovery is expected.

Caution indicates an unsafe practice that could result in damage to the product.

Note indicates a procedure, practice, or condition that must be followed in order for the vehicle or component to function in the manner intended.

A helpful suggestion that will make it quicker and/or easier to perform a procedure, while possibly reducing service cost.

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INTRODUCTION

Service Procedures and Tool Usage

Anyone using a service procedure or tool not recommended in this manual must first satisfy himself thoroughly that neither his safety nor vehicle safety will be jeopardized by the service method he selects. Individuals deviating in any manner from the instructions provided assume all risks of consequential personal injury or damage to equipment involved.

Also note that particular service procedures may require the use of a special tool(s) designed for a specific purpose. These special tools must be used in the manner described, whenever specified in the instructions.

1.Before starting a vehicle, always be seated in the driver’s seat, place the transmission in neutral, apply the parking brakes, and push in the clutch pedal. Failure to follow these instructions could produce unexpected vehicle movement, which can result in serious personal injury or death.

2.Before working on a vehicle, place the transmission in neutral, set the parking brakes, and block the wheels. Failure to follow these instructions could produce unexpected vehicle movement, which can result in serious personal injury or death.

Engine-driven components such as Power Take-Off (PTO) units, fans and fan belts, driveshafts and other related rotating assemblies, can be very dangerous. Do not work on or service engine-driven components unless the engine is shut down. Always keep body parts and loose clothing out of range of these powerful components to prevent serious personal injury. Be aware of PTO engagement or nonengagement status. Always disengage the PTO when not in use.

Do not work under a vehicle that is supported only by a hydraulic jack. The hydraulic jack could fail suddenly and unexpectedly, resulting in severe personal injury or death. Always use jackstands of adequate capacity to support the weight of the vehicle.

Before towing the vehicle, place the transmission in neutral and lift the rear wheels off the ground, or disconnect the driveline to avoid damage to the transmission during towing.

REMEMBER,

SAFETY . . . IS NO ACCIDENT!

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INTRODUCTION

Mack Trucks, Inc. cannot anticipate every possible occurrence that may involve a potential hazard. Accidents can be avoided by recognizing potentially hazardous situations and taking necessary precautions. Performing service procedures correctly is critical to technician safety and safe, reliable vehicle operation.

The following list of general shop safety practices can help technicians avoid potentially hazardous situations and reduce the risk of personal injury. DO NOT perform any services, maintenance procedures or lubrications until this manual has been read and understood.

Perform all service work on a flat, level surface. Block wheels to prevent vehicle from rolling.

DO NOT wear loose-fitting or torn clothing. Remove any jewelry before servicing vehicle.

ALWAYS wear safety glasses and protective shoes. Avoid injury by being aware of sharp corners and jagged edges.

Use hoists or jacks to lift or move heavy objects.

NEVER run engine indoors unless exhaust fumes are adequately vented to the outside.

Be aware of hot surfaces. Allow engine to cool sufficiently before performing any service or tests in the vicinity of the engine.

Keep work area clean and orderly. Clean up any spilled oil, grease, fuel, hydraulic fluid, etc.

Only use tools that are in good condition, and always use accurately calibrated torque wrenches to tighten all fasteners to specified torques. In instances where procedures require the use of special tools which are designed for a specific purpose, use only in the manner described in the instructions.

Do not store natural gas powered vehicles indoors for an extended period of time (overnight) without first removing the fuel.

Never smoke around a natural gas powered vehicle.

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INTRODUCTION

EXPLANATION OF

NUMERICAL CODE

The organization of MACK service manuals has been upgraded to standardize manual content according to a reference system based on component identification. The new reference system will help link the information contained in this publication with related information included in other MACK service/warranty publications, such as associated service bulletins, warranty manuals, and MACK Service Labor Time Standards.

The system is based on a numerical code, the first digit of which identifies the general component grouping as listed here:

GROUP 000 — GENERAL DATA

GROUP 100 — CHASSIS

GROUP 200 — ENGINE

GROUP 300 — CLUTCH, TRANSMISSION, TRANSFER CASE AND PTO

Example:

GROUP 400 — STEERING, AXLES, WHEELS AND TIRES, DRIVELINE

GROUP 500 — BRAKES, AUXILIARY SYSTEMS

GROUP 600 — CAB, TRUCK BODY

GROUP 700 — ELECTRICAL

The second two digits of the three-digit code are used to identify the system, assembly or subassembly, as appropriate, within each of the groupings. The codes applicable to this publication are shown at the beginning of each procedure, as necessary, to guide you to specific component information.

Additionally, a two-character alpha code (i.e., [NV] RINGS, PISTON) may be referenced with each procedure. This alpha code, in combination with the three-digit Group number, identifies the specific assembly, sub-assembly or part, and directly relates to the first five positions of the operation code listed in MACK Service Labor Time Standards.

Numerical Code

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INTRODUCTION

CONVERSION CHART

	Conversion Units			Multiply By:
Length Calculations
Inches (in)		to	Millimeters (mm)	25.40
Inches (in)		to	Centimeters (cm)	2.540
Feet (ft)		to	Centimeters (cm)	30.48
Feet (ft)		to	Meters (m)	0.3048
Yards (yd)		to	Centimeters (cm)	91.44
Yards (yd)		to	Meters (m)	0.9144
Miles		to	Kilometers (km)	1.609
Millimeters (mm)		to	Inches (in)	0.03937
Centimeters (cm)		to	Inches (in)	0.3937
Centimeters (cm)		to	Feet (ft)	0.0328
Centimeters (cm)		to	Yards (yd)	0.0109
Meters (m)		to	Feet (ft)	3.281
Meters (m)		to	Yards (yd)	1.094
Kilometers (km)		to	Miles	0.6214
Area Calculations
Square Inches (sq-in)		to	Square Millimeters (sq-mm)	645.2
Square Inches (sq-in)		to	Square Centimeters (sq-cm)	6.452
Square Feet (sq-ft)		to	Square Centimeters (sq-cm)	929.0
Square Feet (sq-ft)		to	Square Meters (sq-m)	0.0929
Square Yards (sq-yd)		to	Square Meters (sq-m)	0.8361
Square Miles (sq-miles)		to	Square Kilometers (sq-km)	2.590
Square Millimeters (sq-mm)		to	Square Inches (sq-in)	0.00155
Square Centimeters (sq-cm)		to	Square Inches (sq-in)	0.155
Square Centimeters (sq-cm)		to	Square Feet (sq-ft)	0.001076
Square Meters (sq-m)		to	Square Feet (sq-ft)	10.76
Square Meters (sq-m)		to	Square Yards (sq-yd)	1.196
Square Kilometers (sq-km)		to	Square Miles (sq-miles)	0.3861
Volume Calculations
Cubic Inches (cu-in)		to	Cubic Centimeters (cu-cm)	16.387
Cubic Inches (cu-in)		to	Liters (L)	0.01639
Quarts (qt)		to	Liters (L)	0.9464
Gallons (gal)		to	Liters (L)	3.7854
Cubic Yards (cu-yd)		to	Cubic Meters (cu-m)	0.7646
Cubic Centimeters (cu-cm)		to	Cubic Inches (cu-in)	0.06102
Liters (L)		to	Cubic Inches (cu-in)	61.024
Liters (L)		to	Quarts (qt)	1.0567
Liters (L)		to	Gallons (gal)	0.2642
Cubic Meters (cu-m)		to	Cubic Yards (cu-yd)	1.308

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INTRODUCTION

	Conversion Units			Multiply By:
Weight Calculations
Ounces (oz)		to	Grams (g)	28.5714
Pounds (lb)		to	Kilograms (kg)	0.4536
Pounds (lb)		to	Short Tons (US tons)	0.0005
Pounds (lb)		to	Metric Tons (t)	0.00045
Short Tons (US tons)		to	Pounds (lb)	2000
Short Tons (US tons)		to	Kilograms (kg)	907.18486
Short Tons (US tons)		to	Metric Tons (t)	0.90718
Grams (g)		to	Ounces (oz)	0.035
Kilograms (kg)		to	Pounds (lb)	2.205
Kilograms (kg)		to	Short Tons (US tons)	0.001102
Kilograms (kg)		to	Metric Tons (t)	0.001
Metric Tons (t)		to	Pounds (lb)	2205
Metric Tons (t)		to	Short Tons (US tons)	1.1023
Metric Tons (t)		to	Kilograms (kg)	1000
Force Calculations
Ounces Force (ozf)		to	Newtons (N)	0.2780
Pounds Force (lbf)		to	Newtons (N)	4.448
Pounds Force (lbf)		to	Kilograms Force (kgf)	0.456
Kilograms Force (kgf)		to	Pounds Force (lbf)	2.2046
Kilograms Force (kgf)		to	Newtons (N)	9.807
Newtons (N)		to	Kilograms Force (kgf)	0.10196
Newtons (N)		to	Ounces Force (ozf)	3.597
Newtons (N)		to	Pounds Force (lbf)	0.2248
Torque Calculations
Pound Inches (lb-in)		to	Newton Meters (N m)	0.11298
Pound Feet (lb-ft)		to	Newton Meters (N m)	1.3558
Pound Feet (lb-ft)		to	Kilograms Force per Meter (kgfm)	0.13825
Newton Meters (N m)		to	Pound Inches (lb-in)	8.851
Newton Meters (N m)		to	Pound Feet (lb-ft)	0.7376
Newton Meters (N m)		to	Kilograms Force per Meter (kgfm)	0.10197
Kilograms Force per Meter (kgfm)		to	Pound Feet (lb-ft)	7.233
Kilograms Force per Meter (kgfm)		to	Newton Meters (N m)	9.807
Radiator Specific Heat Dissipation Calculations
British Thermal Unit per Hour (BTU/hr)		to	Kilowatt per Degree Celsius (kW/°C)	0.000293
Kilowatt per Degree Celsius (kW/°C)		to	British Thermal Unit per Hour (BTU/hr)	3414.43
Temperature Calculations
Degrees Fahrenheit (°F)		to	Degrees Celsius (°C)	(°F − 32) x 0.556
Degrees Celsius (°C)		to	Degrees Fahrenheit (°F)	(1.8 x °C) + 32

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INTRODUCTION

	Conversion Units			Multiply By:
Pressure Calculations
Atmospheres (atm)		to	Bars (bar)	1.01325
Atmospheres (atm)		to	Kilopascals (kPa)	101.325
Bars (bar)		to	Atmospheres (atm)	0.98692
Bars (bar)		to	Kilopascals (kPa)	100
Bar (bar)		to	Pounds per Square Inch (psi)	14.5037
Inches of Mercury (in Hg)		to	Kilopascals (kPa)	3.377
Inches of Water (in H2O)		to	Kilopascals (kPa)	0.2491
Pounds per Square Inch (psi)		to	Kilopascals (kPa)	6.895
Pounds per Square Inch (psi)		to	Bar (bar)	0.06895
Kilopascals (kPa)		to	Atmospheres (atm)	0.00987
Kilopascals (kPa)		to	Inches of Mercury (in Hg)	0.29612
Kilopascals (kPa)		to	Inches of Water (in H2O)	4.01445
Kilopascals (kPa)		to	Pounds per Square Inch (psi)	0.145
Power Calculations
Horsepower (hp)		to	Kilowatts (kW)	0.74627
Kilowatts (kW)		to	Horsepower (hp)	1.34
Fuel Performance Calculations
Miles per Gallon (mile/gal)		to	Kilometers per Liter (km/L)	0.4251
Kilometers per Liter (km/L)		to	Miles per Gallon (mile/gal)	2.352
Velocity Calculations
Miles per Hour (mile/hr)		to	Kilometers per Hour (km/hr)	1.609
Kilometers per Hour (km/hr)		to	Miles per Hour (mile/hr)	0.6214
Volume Flow Calculations
Cubic Feet per Minute (cu-ft/min)		to	Liters per Minute (L/min)	28.32
Liters per Minute (L/min)		to	Cubic Feet per Minute (cu-ft/min)	0.03531

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INTRODUCTION

ABOUT THE MACK ASET™ AC DIESEL ENGINE

This publication is intended to provide technicians with a working knowledge of the ASET™ AC diesel engine with cooled exhaust gas recirculation. MACK offers a similar engine to the AC which is more suited to the vocational applications called the AI/AMI. The AI/AMI engine is an internal exhaust gas recirculation design engine. For service and overhaul procedures for the ASET™ AI/AMI engine, refer to the 5-110 ASET™ AI/AMI Engines Service Manual. ASET™ is an acronym meaning Application Specific Engine Technology.

The ASET™ AC engine design is based on the E-Tech™ left-side redesign (LSR) with its plate-type oil cooler and oil filter mounting arrangement. A redesigned Centri-Max→ ULTRA, and later ULTRA PLUS, centrifugal oil filter assembly and cover housing with an integral oil fill tube, is incorporated on all AC engines.

The ASET™ AC utilizes a new EECU with greater capacity which is relocated to the front left-side of the inlet manifold. The increased capacity of the EECU requires the addition of a cooling plate to help dissipate heat. The AC design also provides for cooling of the exhaust gases being recirculated through the combustion chambers.

Descriptions of these design changes and the other features are provided in detail in the DESCRIPTION & OPERATION section. Additionally, the service effects of these changes on removal, installation, disassembly, assembly, setup and adjustment procedures, etc., are included in the MAINTENANCE and REPAIR INSTRUCTIONS sections.

Development of the ASET™ AC engine has been driven by three basic requirements. It is designed to:

Meet the year 2004 exhaust emission regulations.

Meet customer demands for improved fuel economy, driveability and engine braking.

Compete in a world market.

Although the drive to reduce emissions levels is primarily the result of government mandates, the ASET™AC engine is designed to be durable and easily maintained and to provide customers with good performance and fuel economy.

Mack Trucks, Inc. is looking beyond the borders of North America to increase its market and bring the quality, toughness and technology associated with the MACK name to a worldwide audience.

The current environment of global regulations concerning exhaust emissions, noise and other factors has leveled the playing field on an international basis. This means that the improvements made to meet the North American environmental regulations are now applied worldwide.

Heater Core and Optional Fuel

Heater Hose Connection Revisions

Beginning second quarter of 2004, a cooling system revision was phased into production that affects the ASET™ AC engines to move the heater core and optional fuel heater coolant return hose connection point. This change moves the heater core and optional fuel heater coolant return hoses from the thermostat housing bypass area to new locations on the lower radiator tube. This change is described in detail in the ENGINE DESIGN FEATURES section of this manual.

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NOTES

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VISUAL IDENTIFICATION

VISUAL IDENTIFICATION

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VISUAL IDENTIFICATION

ENGINE MODEL

IDENTIFICATION

(ASET™ AC ENGINE)

Engine Information Plate

The engine information plate is located on the top of the front cylinder head cover (back cover for LE and MR chassis). This plate includes information concerning:

Engine model, serial number and 11GBA part number.

Advertised horsepower at rated speed rpm.

Emissions regulations to which the engine conforms and other pertinent information required by emissions regulations.

Inlet and exhaust valve lash settings and engine brake slave piston lash setting.

The following explanations are provided to aid in interpreting some of the key information found on the engine information plate.

Item 1 — U.S. EPA Regulations

An X in block 1 means the engine meets United States EPA regulations for the year stamped in block 4.

Item 2 — California Regulations

An X in block 2 indicates the engine meets California emissions regulations for the year stamped in block 4. This engine is referred to as a 50-state engine and can be sold in any state throughout the United States.

Item 3 — ADR Regulations

An X in block 3 means the engine has been certified to meet Australian emissions regulations.

One dash in block 3 indicates that the engine is not to be operated in Australia.

Item 4 — Model Year

The four-digit number stamped in block 4 represents the year in which the engine was certified.

Item 5 — Federal Family

The 12-digit number stamped in block 5 denotes the Federal Family to which the engine belongs, for emissions certification purposes.

All engines will have a 12-digit Federal Family number in block 5.

The letter in the Federal Family number further identifies engine configuration as follows:

V — Vocational ASET™ AI/AMI (IEGR) H — Highway ASET™ AC (CEGR)

G — Natural gas engines

P — (Pumper) non-road engine

Item 6 — California Family

If the engine meets California emissions regulations, the same 12-digit number stamped in the Federal Family block will be stamped in the California block.

If the engine does not meet California emissions regulations, there will be two dashes in block 6.

Item 7 — Exhaust Emission Control System

These letters represent the basic engine systems that impact emissions and are defined as follows:

EM — Engine Modification EC — Engine Control

TC — Turbocharger

CAC — Charge Air Cooler DI — Direct Injection

SPL — Smoke Puff Limiter

CEGR — Cooled Exhaust Gas Recirculation

Item 8 — Engine Brake

This block is used only when the engine is equipped with an engine brake. The number stamped in this block indicates the brake lash setting as follows:

—J-Tech™ Engine Brake — 0.021 inch (0.53 mm)

—PowerLeash™ Engine Brake — 0.045 inch (1.143 mm)

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VISUAL IDENTIFICATION

Item 9 — PowerLeash™ Engine Brake

An X in block 9 indicates the engine was built with a PowerLeash™ engine brake camshaft.

Figure 1 illustrates the location of the information plate and Figure 2 illustrates its content. Figure 3 illustrates a completed sample information plate to be used as an example.

Figure 1 — Engine Information Plate Location (ASET™ AI Engine Shown, AC Same Location)

Figure 2 — Engine Information Plate

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VISUAL IDENTIFICATION

Figure 3 — Sample of Completed Plate

Engine Serial Number Identification

In addition to the engine information plate on the front cylinder head cover, the engine is also identified by the engine serial number stamped into the cylinder block. This serial number is located on the block right side just below the turbo oil drain tube flange as shown in Figure 4.

Figure 4 — Engine Serial Number

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DESCRIPTION AND OPERATION

DESCRIPTION AND OPERATION

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DESCRIPTION AND OPERATION

ENGINE DESIGN FEATURES

(ASET™ AC ENGINES)

In the fall of 2002, Mack Trucks introduced two new engines that comply with changes in governmental laws regulating engine emissions. Both engines evolved from the E7 E-Tech™ and continue with the electronic unit pump (EUP) fuel injection system and the V-MAC→ III electronic control system. The core change in the design of the two new engines, however, is the use of exhaust gas recirculation to lower combustion temperatures for control of nitrogen oxides (NOx). Two different methods are used to accomplish this control. The methods are:

Internal Exhaust Gas Recirculation (IEGR) — AI/AMI engine

Cooled Exhaust Gas Recirculation (CEGR) — AC engine

This manual covers only the ASET™ AC engine’s CEGR design, in which a portion of the exhaust gas is “cooled” externally before it is recirculated through the combustion chambers. The ASET™ AI engine’s IEGR design receives complete service coverage in ASET™ AI/AMI Engines Service Manual 5-110. Regardless of the method used, CEGR or IEGR, both designs are improvements based on changes in several design features of the E7 E-Tech™ current controlled rate shaping (CCRS) engine. The changes are more extensive and visible for the AC engine which is used in linehaul applications at lower governed speeds, than the AI engine which is used in vocational applications at higher governed speeds.

For linehaul operations covered by the CH and CX models, the AC engine lineup provides the optimum in economy and performance with reduced NOx emissions. Included are both Econodyne→ and Maxicruise→.

ASET™ AC ENGINE APPLICATIONS

Engine	Chassis
ASET™ AC	MAXICRUISE→
AC-310/330	CH, CX
AC-330/350	CH, CX
AC-355/380	CH, CX
AC-380/410	CH, CX
ASET™ AC	ECONODYNE→
AC-350	CH, CX
AC-400	CH, CX
AC-427	CH, CX
AC-460 (E)	CH, CX
AC-460 (P)	CH, CX

The MACK PowerLeash™ engine brake was introduced on ASET™ engines during mid-2003. The PowerLeash™ brake is integrated into the rocker shaft assemblies and uses the standard height cylinder head cover. Compared to add-on engine brakes, the PowerLeash™ brake has lighter weight, increased braking output, improved response and more consistent operation.

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DESCRIPTION AND OPERATION

ASET™ AC Engine Technologies

The ASET™ AC engine uses current controlled rate shaping (CCRS) phased into production during 2001. Current controlled rate shaping provides a modulated two-phase injection of fuel into the cylinder. With the two-phase method, a small volume of fuel is injected into the cylinder prior to ignition followed immediately by the primary fuel charge after ignition (Figure 5). This phased injection of fuel effectively helps to lower NOx emissions and improve stability at idle.

Figure 5 — CCRS “Phased” Fuel Injection

1.	Pressure (bar)	4.	CCRS Phase 2
2.	Timing	5.	Non-CCRS
3. CCRS Phase 1

The port design of the cylinder heads, the valve seat inserts and the piston crowns have been redesigned to change the swirl characteristics of the inlet charge. The redesigned piston is cast with a re-entrant bowl shape that is narrower at the top and widens as it curves deeper into the crown (Figure 6).

Figure 6 — Redesigned Piston Crown

1. Piston Crown	2. Re-Entrant Bowl

In addition, both the inlet and exhaust valve seat inserts are of a new design that has a smooth rounded radius (Figure 7) to achieve the optimum flow of air and exhaust gases in and out of the cylinders. With these changes, swirl is generated within the cylinder where it is needed to effectively mix inlet air, fuel and recirculated exhaust gas. Along with swirl characteristics, compression ratios have been changed for combustion efficiency, improved cold-start capability, faster warm-up and improved idle stability. Also, the top compression ring face coating has been revised to provide long life and less cylinder bore wear.

At the base of the valve seat insert radii, the contact surfaces with the valves are 30 degrees and 20 degrees, respectively, for exhaust and inlet valves. This is the same as current engines. However, the new design of the seat inserts prevents their removal in the traditional manner. A revised procedure for replacing the inserts is covered in the REPAIR INSTRUCTIONS section.

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