MACK Mp8 Service Manual

MACK® MP8

DIESEL ENGINE

SERVICE MANUAL

(EURO 4)

JULY 2009 (REVISED)

5-117

MACK® MP8 DIESEL ENGINE

SERVICE MANUAL (EURO 4)

JULY 2009 (REVISED — SUPERSEDES ISSUE DATED JANUARY 2009)

ENGINE 5-117

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. Note that illustrations and instructions are based on information that is subject to change as new engine/chassis development continues.

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.

Page ii

TABLE OF CONTENTS

Page iii

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 MP8 EURO 4 ENGINE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Service Precautions Summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

VISUAL IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

MP8 EURO 4 ENGINE MODEL IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Engine Information Plate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

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

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

MACK MP8 EURO 4 ENGINE DESIGN FEATURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Engine Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Lubrication System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Crankcase Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

PowerLeash™ Engine Brake . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Exhaust Gas Recirculation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Air Intake System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Variable Geometry Turbocharger (VGT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37

Engine Management System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38

GLOSSARY OF TERMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40

COMPONENT LOCATOR . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

MP8 EURO 4 ENGINE COMPONENT LOCATION VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44

TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49

ENGINE SYMPTOM DIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

Troubleshooting Technique . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .50

Noise and Vibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50

ENGINE CHECKS AND TESTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52

Camshaft Sensor Depth, Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Camshaft Timing, Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55

Crankcase Ventilation, Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .56

Cylinder Head, Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .57

Cylinder Liner and Piston Wear, Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58

EGR Cooler, Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59

Engine Compression, Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60

Flywheel Housing Runout, Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62

Oil Cooler, Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63

Rocker Arm, Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64

Thermostat, Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67

Valve Guide Wear, Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68

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TABLE OF CONTENTS

MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69

LUBRICATION SYSTEM MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Special Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Oil Level Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70

Oil and Filter Change Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

Crankcase Ventilation System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .71

FUEL FILTER REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

Fuel Filter Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72

COOLING SYSTEM MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Special Tool . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Coolant Drain Outlets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

Coolant Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74

DRIVE BELT REPLACEMENT AND TENSIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Automatically Tensioned System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

REPAIR INSTRUCTIONS, PART 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

ENGINE REMOVAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78

General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79

ENGINE DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82

General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

Mounting the Engine on a Repair Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86

EGR Crossover Piping Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87

EGR Venturi Tube Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .88

Cylinder Head (Valve) Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Engine Wiring Harness Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89

Timing Gear Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .90

Camshaft Gear and Vibration Damper Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91

Rocker Arm Shaft Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .92

Valve Yoke (Bridge) Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .94

Camshaft Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94

Unit Injector Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95

Starter Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100

Turbocharger Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

EGR Hot Pipe (Cooler Inlet) Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 102

EGR Valve Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 103

EGR Cooler Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 104

Exhaust Manifold Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 106

Oil Filter Housing Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Coolant and Pump Inlet Housings Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107

Cooling Duct Cover and Oil Cooler Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 108

Drive Belts and Fan Hub Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 109

EGR Mixer Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 110

Crankcase Ventilation (CCV) Separator Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 111

Fuel Lines and Filter Housing Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112

EECU and Cooling Plate Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 113

Inlet Manifold Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Tandem Pump (Fuel and Power Steering) Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114

Air Compressor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

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Flywheel and Pilot Bearing Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 115

Power Take-Off (PTO) Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 116

Flywheel Housing Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117

Crankshaft Rear Seal Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Timing Gear Train Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118

Timing Gear Plate Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 119

Alternator and Refrigerant Compressor Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Thermostat and Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120

Coolant Pump Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Cylinder Head Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 121

Crankshaft Vibration Damper and Fan Pulley Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Crankshaft Front Cover Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 123

Crankshaft Front Seal Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Oil Fill Pipe and Dipstick Retainer Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 124

Oil Pan Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Front Engine Support Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125

Block Stiffener Plate Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Oil Pump Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 126

Piston and Connecting Rod Assembly Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 127

Main Bearing Cap Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128

Crankshaft Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 129

CYLINDER BLOCK RECONDITIONING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 130

Piston Cooling Spray Nozzle Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Cylinder Liner Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

Block Cleaning and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 132

Liner Height Measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 133

Cylinder Liner Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 134

FLYWHEEL BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

Flywheel Ring Gear Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 135

CONNECTING ROD AND PISTON BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Connecting Rod — Piston Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 136

Piston Inspection and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 137

Piston Ring Inspection and Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 138

Connecting Rod — Piston Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 139

CYLINDER HEAD OVERHAUL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 141

Inlet and Exhaust Valve Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Cylinder Head Cleaning and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Valve Guide Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 146

Valve Spring Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Injector Sleeve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 148

Expansion Plug Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155

Valve Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

Valve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 156

ROCKER ARM SHAFT BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Rocker Arm Shaft Disassembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

Rocker Arm Shaft Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158

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CAMSHAFT BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

Camshaft Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 159

COOLING SYSTEM COMPONENTS BENCH PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . .161

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 161

Oil Cooler Reconditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

EGR Cooler Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 162

EGR Cooler Pressure Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 164

ENGINE REASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 167

General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Crankshaft Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171

Main Bearing Cap Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172

Piston and Connecting Rod Assembly Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 175

Oil Pump and Block Stiffener Plate Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .177

Oil Pump Pipes and Strainer Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 178

Front Engine Support Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Crankshaft Front Cover and Seal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 179

Timing Gear Plate Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 181

Cylinder Head Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182

Camshaft Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 185

Timing Gear Train Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186

Unit Injector Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 190

Valve Yoke (Bridge) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 192

Rocker Arm Shaft and Engine Brake Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 193

Flywheel Housing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 196

Crankshaft Rear Seal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

Flywheel and Pilot Bearing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198

Oil Pan Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200

Oil Filler Pipe and Dipstick Pipe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202

Power Take-Off Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

Timing Gear Cover Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 203

Coolant Pump Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

Thermostat and Cover Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206

Coolant Pipe Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 207

Oil Cooler and Cooling Duct Cover Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 208

Oil Filter Housing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 209

Exhaust Manifold Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 210

EGR Valve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 212

EGR Cooler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 214

EGR Hot Pipe (Cooler Inlet) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 216

Turbocharger Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

Starter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 219

Air Compressor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220

Tandem Pump (Fuel and Power Steering) Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

Inlet Manifold Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 221

EGR Mixer Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 222

EECU and Cooler Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

Fuel Lines and Filter Housing Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 223

Crankcase Ventilation Separator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 225

Crankshaft Vibration Damper and Fan Pulley Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . .225

Alternator and Refrigerant Compressor Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 226

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Wiring Harness Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 227

Cylinder Head (Valve) Cover Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228

EGR Venturi Tube and Crossover Piping Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 229

Fan Hub and Drive Belt Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 232

Removing Engine from Engine Stand . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 233

Filters and Miscellaneous Components Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 234

ENGINE INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

General Instructions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 235

Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 236

REPAIR INSTRUCTIONS, PART 2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 239

IN-CHASSIS PART/COMPONENT PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240

CAMSHAFT BEARING BRACKETS, REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240

Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240

General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 240

Camshaft Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

Bracket Replacement Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241

Final Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242

OIL THERMOSTAT AND PRESSURE SAFETY VALVE REPLACEMENT . . . . . . . . . . . . . . . . . 243

Pressure Safety Valve Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243

Oil Thermostat Valve Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 244

CRANKSHAFT FRONT SEAL REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Seal Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 245

Seal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 246

CRANKSHAFT REAR SEAL REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

Neoprene Seal Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

Neoprene Seal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 248

Teflon

CRANKCASE VENTILATION (CCV) SEPARATOR REPLACEMENT . . . . . . . . . . . . . . . . . . . . . 252

CCV Separator Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252

CCV Separator Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252

OIL PUMP REPLACEMENT (IN CHASSIS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 253

Oil Pump Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

Oil Pump Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 254

INJECTOR COPPER SLEEVE REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256

Tools and Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 256

Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Copper Sleeve Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258

Copper Sleeve Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 262

Final Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 265

TURBOCHARGER SMART REMOTE ACTUATOR (SRA) REPLACEMENT . . . . . . . . . . . . . . . . 266

Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

Turbocharger SRA Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 266

Turbocharger SRA Inspection and Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 268

Final Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 271

Seal Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 249

Seal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 250

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UNIT INJECTOR CLEANING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

Cleaning and Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 272

Final Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

VALVE STEM HEIGHT MEASUREMENT PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 274

VALVE STEM SEAL REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277

Preliminary Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Seal Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Seal Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 278

Final Steps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

REPAIR INSTRUCTIONS, PART 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 281

MP8 ENGINE SETUP AND ADJUSTMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 282

Valve and Unit Injector Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 284

Checking and Adjusting Timing Gear Backlash . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 289

ENGINE FINAL PREPARATION AND OPERATIONAL CHECK . . . . . . . . . . . . . . . . . . . . . . . . . 293

Filter Element Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

Engine Lubrication System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

Turbocharger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293

Cooling System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294

Fuel System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294

Engine Operational Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 296

REBUILT ENGINE RUN-IN PROCEDURES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

Run-In Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297

SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 299

MP8 ENGINE MECHANICAL SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300

Material and Dimensional Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 300

Engine Component Torque Specifications (Critical Fasteners) . . . . . . . . . . . . . . . . . . . . . . . . 305

Standard Bolt and Nut Torque Values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332

ENGINE GASKETS, LUBRICANTS AND SEALANTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333

Gasket and Seal Reuse . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 333

Lubricants and Sealants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334

SPECIAL TOOLS & EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335

MP8 ENGINE SERVICE TOOLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336

Special Tools for Engine Overhaul . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336

INDEX . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 351

Page ix

NOTES

Page x

INTRODUCTION

Page 1

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.

Page 2

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!

Page 3

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.

앫 Perform all service work on a flat, level

surface. Block wheels to prevent vehicle from rolling.

앫 DO NOT wear loose-fitting or torn clothing.

Remove any jewelry before servicing vehicle.

앫 ALWAYS wear safety glasses and protective

shoes. Avoid injury by being aware of sharp corners and jagged edges.

앫 Use hoists or jacks to lift or move heavy

objects.

앫 NEVER run engine indoors unless exhaust

fumes are adequately vented to the outside.

앫 Be aware of hot surfaces. Allow engine to

cool sufficiently before performing any service or tests in the vicinity of the engine.

앫 Keep work area clean and orderly. Clean up

any spilled oil, grease, fuel, hydraulic fluid, etc.

앫 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.

앫 Do not store natural gas powered vehicles

indoors for an extended period of time (overnight) without first removing the fuel.

앫 Never smoke around a natural gas powered

vehicle.

Page 4

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 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

, the

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 [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.

(i.e.,

Example:

Numerical Code

Page 5

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

Page 6

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

Page 7

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

Page 8

INTRODUCTION

ABOUT THE MACK MP8 EURO 4 ENGINE [200 EA]

Figure 1 — MACK MP8 Engine — for Conventional Chassis

The MACK MP8 is a 13 liter (800 CID) engine with electronic unit injectors, a cooled Exhaust Gas Recirculation (EGR) system and the Holset Variable Geometry Turbocharger (VGT). The PowerLeash™ engine brake is optional. The engine conforms to Euro 4 emissions requirements.

The MP8 EGR system features reduced restriction plus enhanced efficiency and reliability. Its venturi system is easy to service.

The Holset VGT features fixed vanes with a sliding nozzle ring. The nozzle position is infinitely variable between open and closed. This design reacts quickly to exhaust pressure and controls inlet pressure more precisely. Reliability is enhanced by having fewer moving parts. Its actuator and bearing housing are water cooled and engine oil lubricated for greater durability.

A wide range of the current transmission offerings, including manual, automated manual and automatic, can be teamed with the MP8.

Diagnostic help can be found in the Premium/Volvo Tech Tool. In some markets the diagnostic tool is Premium Tech Tool (PTT) and in other markets the diagnostic tool is Volvo Tech Tool (VTT). Contact your local dealer for Tech Tool availability.

The engine weighs approximately 1200 kg (2646 lb.) dry (with air compressor, without oil, coolant, starter, fan, alternator and clutch). Its design includes a one-piece cylinder head, a single overhead camshaft, three rocker arms per cylinder, unit injectors and no pushrods. PowerLeash™ engine braking, requiring a fourth rocker arm, is optional. Monosteel™ steel pistons are made in one piece.

Page 9

INTRODUCTION

Do NOT use starting fluid (ether) on engines equipped with an inlet manifold air heater element. An explosion could occur. Failure to heed this danger may result in severe personal injury or death.

Two optional fan drives are available: On/Off and electronically actuated. The electronically actuated viscous fan drive is precisely controlled by the Engine Electronic Control Unit (EECU).

The electronically actuated fan drive is not available on vehicles manufactured for Australia.

Timing gears mount on the rear of the MP8 improving the flow of cooling air around the front. Special service instructions apply to the camshaft position sensor. The mounting plate, idler and camshaft gears are marked to facilitate proper installation. The air compressor drive gear meshes with the double idler instead of the auxiliary idler as on the MP7 engine.

The MP8 uses unit injectors. The unit injector incorporates the pump, valve and injector. Its internal solenoids permit fast, precise control of fuel delivery into the cylinder. The unit injectors are encased by the valve cover and not exposed to the heat of exhaust system components.

Replacing injectors requires a specific procedure, and installation requires that the EECU be programmed to recognize replacement injectors. Cleaning injector bores requires a special tool.

An engine compression brake option on the MP8 engine assists deceleration and braking. The operation of the brake differs from earlier engine models. Working in conjunction with the exhaust cycle, the brake requires a camshaft with four cams per cylinder, two rocker arms for the exhaust valves, a bridge over the two exhaust valves, an electronic control valve and a wiring harness that includes the control valve. The exhaust valves are adjusted with shims.

Preventive maintenance is important to get the most from the MACK MP8 engine and to ensure many years of reliable, trouble-free operation. Refer to the current TS943 Maintenance and Lubrication manual for schedules and specifications.

Another feature of the MP8 is the rear engine power take-off (REPTO-ready) that is gear driven through the timing gear train. An optional PTO with drive gear, bearing and housing can be added at the factory.

The rocker arm shaft is held in place by camshaft bearing capscrews. There are special instructions for installing the camshaft bearing caps and the rocker arm shaft during service.

A stiffener plate fastens to the bottom of the cylinder block to ensure block strength and rigidity. The engine can be used with axle forward or axle back vehicles by virtue of optional oil pans. The engine fan is mounted high or low depending on vehicle configuration.

Repair instructions in this manual deal with removal, installation, disassembly, assembly, setup and adjustments of MP8 components.

There are restrictions concerning the reuse of certain fasteners. Refer to current specifications bulletins and the SPECIFICATIONS section of this manual for detailed information.

Page 10

INTRODUCTION

Service Precautions Summary

Following is a summary list of the DO and DON’T issues applying to MP8 engine service.

1. DO NOT machine the cylinder head for clean-up since this will change injector depth, thereby affecting emissions. It will also upset the ability to correctly adjust timing gear backlash.

2. DO NOT grind the injector copper sleeves.

3. Install the crankshaft main bearing caps according to marked assembly number.

4. Connecting rod caps MUST BE mated to their respective connecting rods due to the “fractured manufacturing” process used. Also, the rod caps can be installed only one way because of the difference in spacing between screw holes at each side of the cap.

5. DO NOT use the lifting eye on the flywheel housing when tilting the engine/transmission assembly to an angle greater than 15 degrees.

6. Cylinder head installation requires lowering the head onto the gasket using the alignment screws and washers at the sides of the head and block. The head must be pulled back to the mounting plate using screws inserted through the plate. Pressed bosses in the gasket keep the head from making full contact with the gasket surface and prevent damage to the elastomer sealing rings as the head slides into position.

7. Do NOT use starting fluid (ether) on engines equipped with an inlet manifold air heater element.

The use of starting fluid (ether) on engines equipped with an inlet manifold air heater element is prohibited. An explosion could occur. Failure to heed this danger may result in severe personal injury or death.

8. The MP8 engine uses a number of O-rings for sealing various fluid joints and tubes. It is essential that new O-rings of the correct material be used whenever joints are disassembled and reassembled.

Page 11

NOTES

Page 12

VISUAL IDENTIFICATION

Page 13

VISUAL IDENTIFICATION

MP8 EURO 4 ENGINE MODEL IDENTIFICATION

Engine Information Plate

The engine information plate is located on the top of the cylinder head (valve) cover. This plate includes information concerning the following items.

앫 Engine model and emissions level

앫 Torque limitation

앫 SW calibration

앫 Maximum torque

앫 Rated power and speed

앫 Engine displacement

앫 Low idle speed

앫 Exhaust brake

In addition to the information plate, there is another label on the cylinder head (valve) cover. This additional label lists the chassis number, engine serial number and respective barcodes.

Figure 2 — Engine Information Plate

Engine Serial Number Identification

In addition to the engine information plate on the 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 left side at the front just below the inlet manifold.

Page 14

DESCRIPTION AND OPERATION

Page 15

DESCRIPTION AND OPERATION

MACK MP8 EURO 4 ENGINE DESIGN FEATURES

[200 EA]

Figure 3 — MACK MP8 Euro 4 Engine — Conventional

Chassis

To accommodate the low cab forward design, the EGR system and the inlet manifold are configured differently than for the conventional chassis. The EGR mixer mounts at the front of the inlet manifold on the conventional chassis, but near the rear of the manifold on the low cab forward design.

Engine Components

Main features of the cylinder head are:

앫 One-piece cast iron

앫 Integral thermostat housing

Separate chambers for exhaust and inlet at each cylinder make this a “crossflow” design. The fuel channel, drilled from front to rear, connects with grooves machined around each injector opening. A plug at the rear of the cylinder head seals this channel.

CAMSHAFT AND VALVE TRAIN

The engine has an overhead camshaft and rocker arm shaft in support of four valves per cylinder. The camshaft rides on seven journals with a bearing cap and support block (saddle) at each point. The bearing inserts (shells), bearing caps and support blocks are replaceable.

In standard configuration (with VGT exhaust brake only), there are three cams for each cylinder, including inlet, injection and exhaust. There are four cams per cylinder in the optional configuration (VGT exhaust brake plus PowerLeash™) with the addition of a “brake” cam at each cylinder.

The rocker arms are positioned on the shaft (front to back) in the order of inlet, injector, exhaust and brake, if so equipped. Both the inlet and exhaust rocker arms each drive the valve pairs via a pinless yoke (bridge). On engines equipped with PowerLeash™, the “brake” rocker arm works in combination with the exhaust rocker arm to precisely control the opening and closing of the exhaust valves for engine braking.

CYLINDER HEAD

Figure 4 — Cylinder Head with Valves and Camshaft

Page 16

Supports

DESCRIPTION AND OPERATION

Figure 5 — Valve Train (with PowerLeash™)

1. Inlet Valve Yoke (Bridge)

2. Inlet Valve Rocker Arm

3. Injector Rocker Arm

4. Exhaust Valve Rocker Arm

5. PowerLeash™ Rocker Arm

6. Exhaust Valve Yoke (Bridge)

7. Shim Retaining Screw

Exhaust valve yokes include a shim for adjustment. Replaceable valve guides and seats are made of alloyed cast iron and steel respectively. All valve guides have oil seals. Exhaust valves have double valve springs.

Rollers in the ends of the rocker arms contact the cam shaft. The contacts with the yokes have ball sockets for flexibility.

Figure 6 — Camshaft and Rocker Arms (with

1. Engine Brake Cam

2. Exhaust Cam

PowerLeash™)

3. Injector Cam

4. Inlet Cam

Timing marks on the camshaft provide for valve and injector adjustment. PowerLeash™ includes its own electronic control governed by driver's choice through a switch near the steering wheel. This control mounts on the cylinder head between the No. 3 and No. 4 cylinder rocker arms. The wiring harness includes additional wire leads for PowerLeash™.

The camshaft is induction-hardened. Timing marks for valve and injector adjustment are located on the flange forward of the No. 1 camshaft journal. These marks are for adjusting valve clearance. They do not apply to camshaft timing.

Camshaft thrust washers are integral on the No. 7 journal bearing. Smooth rotation is ensured by means of a vibration damper on the camshaft gear. Teeth on the damper interact with the camshaft position sensor for input to the EECU.

Figure 7 — MP8 Engine Timing Marks — Camshaft Front

End

Page 17

DESCRIPTION AND OPERATION

CYLINDER BLOCK

The cylinder block is made of cast iron. For increased cylinder block rigidity and noise and vibration reduction, a steel stiffener plate attaches to the bottom.

The main and piston lubricating channels are drilled longitudinally through the block. These are plugged at the front of the block. The main channel opens into a cast-in channel that supplies oil to the timing gears. The piston cooling channel is covered by the timing gear cover.

HEAD TO BLOCK ALIGNMENT

Figure 9 — Head to Block Alignment Screws and

Washers

Figure 8 — Cylinder Block and Stiffener Plate

1. Cylinder Block 2. Block Stiffener Plate

Main bearing caps are made of nodular cast iron machined together with the cylinder block. Cast alignment slots in the block and tabs on the caps ensure proper alignment at installation. Each cap is marked with its location beginning with No. 1 at the front. Cap Nos. 4 and 7 are unique and are not numbered.

The block includes cylinder liners that contact the coolant directly (wet liners). The casting shape follows the contours of the cylinders to increase rigidity and reduce noise.

1. Cylinder Head

2. Alignment Screws and Washers

3. Cylinder Block

Three screws and washers installed at the side (two in the block and one in the head) align the head from side to side at assembly. Fore and aft, the head is aligned by contact with the timing gear mounting plate.

The head is aligned with the timing gear plate by screws passed through the plate into the head and tightened securely. It is extremely important to remove these screws before attempting to remove the cylinder head from the block. Failure to heed this caution may result in severe damage to the timing gear plate and other engine components.

Page 18

DESCRIPTION AND OPERATION

CYLINDER HEAD GASKET

The cylinder head gasket is made of one piece of sheet steel with vulcanized elastomer seals on oil and coolant conduits. The design of the engine and head gasket requires a unique procedure for installation of the cylinder head.

The screws and washers at the side guide the head into side-to-side alignment as it is laid on the gasket and block. Screws passed through the timing gear mounting plate into the head pull the head into alignment fore and aft. Small, stamped bosses on the gasket hold the head clear of the seals and allow it to glide accurately into position against the mounting plate during installation. Tightening the head bolts flattens the bosses on the gasket. For this reason, a new head gasket must be installed whenever the head is removed.

CYLINDER LINERS

The cylinder block uses replaceable wet cylinder liners. The lower end of each liner is sealed against the block with three elastomer rings. The upper end is sealed with a ring of EPDM elastomer situated directly under the liner collar. This design cools the upper section of the liner better because the area of coolant circulation is larger.

The lower seals are fitted in grooves in the cylinder block. The bottom seal is of a different material and fluorescent violet in color to distinguish it from the intermediate seals.

Figure 10 — Cylinder Head Gasket

Figure 11 — Cylinder Liner and Seals

1. Upper O-Ring — EPDM (Black)

2. Middle Sealing Rings — EPDM (Black)

3. Lower Sealing Ring — Viton (Purple)

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