CUMMINS N14, N14 Celect Plus, N14330E Shop Manual

Foreword

This manual contains complete rebuild specifications and information for the N14 model engines, and all asso­ciated components manufactured by Cummins Engine Company, Inc. A listing of accessory and component
suppliers’ addresses and telephone numbers is located in Section C. Suppliers can be contacted directly for any
information not covered in this manual.

The repair procedures in this manual are based on the engine being installed on an approved engine stand. Some
rebuild procedures require the use of special service tools. Make sure the correct tools are used as described in
the procedures.

When a specific brand name, number, or special tool is referenced in this manual, an equivalent product can be
used in place of the recommended item.

A series of specific service manuals (Troubleshooting and Repair, Specifications, Alternative Repair, and so on.)
are available and can be ordered by filling out and mailing the Literature Order Form located in the Service
Literature Section L.

Reporting of errors, omissions, and recommendations for improving this publication by the user is encouraged.
Please use the postage paid, self-addressed Literature Survey Form in the back of this manual for communicating
your comments.

The specifications and rebuild information in this manual isbased on the information in effect at the time of printing.
Cummins Engine Company, Inc. reserves the right to make any changes at any time without obligation. If
differences are found between your engine and the information in this manual, contact a Cummins Authorized
Repair Location, a Cummins Division Office, or the factory.

The latest technology and the highest quality components are used to manufacture Cummins engines. When
replacement parts are needed, we recommend using only genuine Cummins or ReConT exchange parts. These
parts can be identified by the following trademarks:

TABLE OF CONTENTS

Introduction................................................................................................................................................ i-1

Group 0 - Engine Disassembly and Assembly........................................................................................... 0-1

Group 1 - Cylinder Block........................................................................................................................... 1-1

Group 2 - Cylinder Head ........................................................................................................................... 2-1

Group 3 - Rocker Levers........................................................................................................................... 3-1

Group 4 - Cam Followers .......................................................................................................................... 4-1

Group 5 - Fuel System.............................................................................................................................. 5-1

Group 6 - Injectors and Fuel Lines............................................................................................................ 6-1

Group 7 - Lubricating Oil System .............................................................................................................. 7-1

Group 8 - Cooling System......................................................................................................................... 8-1

Page

Group 9 - Drive Units................................................................................................................................ 9-1

Group 10 - Air Intake System .................................................................................................................... 10-1

Group 11 - Exhaust System ...................................................................................................................... 11-1

Group 12 - Air Equipment ......................................................................................................................... 12-1

Group 13 - Electrical Equipment ............................................................................................................... 13-1

Group 14 - Engine Testing........................................................................................................................ 14-1

Group 15 - Instruments and Controls ........................................................................................................ 15-1

Group 16 - Mounting Adaptations ............................................................................................................. 16-1

Group 18 - Specifications............................................................................................................................18-1

Group 20 - Vehicle Braking....................................................................................................................... 20-1

Component Manufacturers: Names and Addresses......................................................................................C-1

Service Literature .........................................................................................................................................L-1

Index............................................................................................................................................................X-1

Literature Survey Form ..............................................................................................................................back

Cummins 22-Group System Exploded Diagram

Section I - Introduction
N14 Page i-1

Section I - Introduction

Section Contents

Page

Engine Diagrams .............................................................................................................................................. i-13

Engine Identification ........................................................................................................................................ i-12

General Cleaning Instructions.......................................................................................................................... i-16

Glass or Plastic Bead Cleaning...................................................................................................................... i-16

Solvent and Acid Cleaning ............................................................................................................................. i-16

Steam Cleaning ............................................................................................................................................. i-16

General Repair Instructions ............................................................................................................................... i-3

General Safety Instructions ............................................................................................................................... i-4

Important Safety Notice.................................................................................................................................... i-4

Glossary Of Terms............................................................................................................................................ i-10

Illustrations......................................................................................................................................................... i-9

Manual Organization........................................................................................................................................... i-2

Group Contents................................................................................................................................................ i-2

Index ............................................................................................................................................................... i-2

Metric Information ............................................................................................................................................ i-2

Table of Contents............................................................................................................................................. i-2

Simbolos Usados En Este Manual .................................................................................................................... i-6

Symbole.............................................................................................................................................................. i-8

Symboles Utilises Dans Ce Manuel .................................................................................................................. i-7

Symbols Used in this Manual ........................................................................................................................... i-5

Manual Organization Section I - Introduction

N14Page i-2

Manual Organization

All references to engine components in this manual are divided into 22 specific groups. The organization is
consistent with the service bulletins, service parts topics, and the parts catalogs for your convenience in updating
your copy of the shop manual.

Table of Contents

The Table of Contents in the front of the manual contains a quick page reference for each group number.

Group Contents

Each group contains the following information:

• A ‘‘Section Contents’’ page at the beginning of each group to quickly aid in locating the information desired.

• A Service Tools list with recommended tools needed to rebuild the components.

• General information to aid in rebuilding the component and an explanation of design change differences.

• Step-by-step rebuild instructions for disassembly, cleaning, inspection, and assembly of the component.

• Symbols which represent the action outlined in the instructions. The definitions of the symbols, listed in four
languages (English, Spanish, French, and German), appear on pages i-5 through i-8.

Index

An alphabetical index is in the back of the manual to aid in locating specific information.

Metric Information

Both metric and U.S. customary values are used in this manual. The metric value is listed first, followed by the
U.S. customary in brackets. An example is 60°C [140°F].

Section I - Introduction General Repair Instructions
N14 Page i-3

General Repair Instructions

This engine incorporates the latest diesel technology; yet, it is designed to be repaired using normal repair
practices performed to quality standards.

• Cummins Engine Company, Inc. does not recommend or authorize any modifications or repairs to

engines or components except for those detailed in Cummins Service Information. In particular, un­authorized repair to safety-related components can cause personal injury. Below is a partial listing of
components classified as safety-related:

Air Compressor
Air Controls
Air Shutoff Assemblies
Balance Weights
Cooling Fan
Fan Hub Assembly
Fan Mounting Bracket(s)
Fan Mounting Capscrews
Fan Hub Spindle
Flywheel
Flywheel Crankshaft Adapter
Flywheel Mounting Capscrews
Fuel Shutoff Assemblies
Fuel Supply Tubes
Lifting Brackets
Throttle Controls
Turbocharger Compressor Casing
Turbocharger Oil Drain Line(s)
Turbocharger Oil Supply Line(s)
Turbocharger Turbine Casing
Vibration Damper Mounting Capscrews

• Follow All Safety Instructions Noted in the Procedures.

- Follow the manufacturer’s recommendations for cleaning solvents and other substances used during the
repair of the engine. Always use good safety practices with tools and equipment.

• Provide A Clean Environment and Follow the Cleaning Instructions Specified in the Procedures

- The engine and its components must be kept clean during any repair. Contamination of the engine and
components will cause premature wear.

• Perform the Inspections Specified in the Procedures.

- The inspections will result in a minimal number of parts requiring replacement. The cost of the rebuild
will be reduced more than the cost of the additional inspection time.

• Replace all Components or Assemblies Which are Damaged or Worn Beyond the Specifications

• Use Genuine Cummins New or ReConW Service Parts and Assemblies

- The assembly instructions have been written to reuse as many components and assemblies as possible.
When it is necessary to replace a component or assembly, the procedure is based on the use of new
Cummins or Cummins ReConW components. All of the repair services described in this manual are
available from all Cummins Distributors and most Dealer locations.

• Follow The Specified Disassembly and Assembly Procedures to Avoid Damage to the Components.
Complete troubleshooting and repair instructions are available in the Troubleshooting and Repair Manual which

can be ordered or purchased from a Cummins Authorized Repair Location. Refer to Section L, Literature, for
ordering instructions.

General Safety Instructions Section I - Introduction

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General Safety Instructions

Important Safety Notice

WARNING

Read and understand all of the safety precautions and warnings before performing any repair. This list contains
the general safety precautions that must be followed to provide personal safety. Special safety precautions are
included in the procedures when they apply.

• Make sure the work area surrounding the product is safe. Be aware of hazardous conditions that can exist.

• Always wear protective glasses and protective shoes when working.

•Donot wear loose-fitting or torn clothing. Remove all jewelry when working.

• Disconnect the battery and discharge any capacitors before beginning any repair work. Disconnect the air

starting motor if equipped to prevent accidental engine starting. Put a ″Do Not Operate″ tag in the operator’s
compartment or on the controls.

• Use ONLY the proper engine barring techniques for manually rotating the engine. Do not attempt to rotate
the engine by pulling or prying on the fan. This practice can cause serious personal injury, property damage,
or damage to the fan blade(s) causing premature fan failure.

• If an engine has been operating and the coolant is hot, allow the engine to cool before you slowly loosen the
filler cap and relieve the pressure from the cooling system.

•Donot work on anything that is supported ONLY by lifting jacks or a hoist. Always use blocks or proper stands
to support the product before performing any service work.

• Relieve all pressure in the air, oil, and the cooling systems before any lines, fittings, or related items are
removed or disconnected. Be alert for possible pressure when disconnecting any device from a system that
utilizes pressure. Do not check for pressure leaks with your hand. High pressure oil or fuel can cause personal
injury.

• To prevent suffocation and frostbite, wear protective clothing and ONLY disconnect liquid refrigerant (freon)
lines in a well ventilated area.

• To avoid personal injury, use a hoist or get assistance when lifting components that weigh 23 kg [50 lb] or
more. Make sure all lifting devices such as chains, hooks, or slings are in good condition and are of the correct
capacity. Make sure hooks are positioned correctly. Always use a spreader bar when necessary. The lifting
hooks must not be side-loaded.

• Cooling System corrosion inhibitor contains alkali. Do not get the substance in your eyes. Avoid prolonged
or repeated contact with skin. Do not swallow internally. In case of contact, immediately wash skin with soap
and water. Incase ofcontact, immediately flood eyes withlarge amountsof water fora minimumof 15 minutes.
IMMEDIATELY CALL A PHYSICIAN. KEEP OUT OF REACH OF CHILDREN.

• Naptha and Methyl Ethyl Ketone (MEK) are flammable materials and must be used with caution. Follow the
manufacturer’s instructions to provide complete safety when using these materials. KEEP OUT OF REACH
OF CHILDREN.

• To avoidburns, be alert for hotparts on products that havejust been turned OFF, and hot fluids in lines,tubes,
and compartments.

• Always use tools that are in good condition. Make sure you understand how to use them before performing
any service work. Use ONLY genuine Cummins or Cummins ReconW replacement parts.

• Always use the same fastener part number (or equivalent) when replacing fasteners. Do not use a fastener
of lessor quality if replacements are necessary.

Section I - Introduction Symbols Used in this Manual
N14 Page i-5

Symbols Used in this Manual

The following group of symbols has been used in this manual to help communicate the intent of the instructions.
When one of the symbols appears, it conveys the meaning defined below.

WARNING - Serious personal injury or extensive property damage can result if the warning
instructions are not followed.

CAUTION - Minor personal injury can result or a part, an assemblyor the engine canbe damaged
if the caution instructions are not followed.

Indicates a REMOVAL or DISASSEMBLY step.

Indicates an INSTALLATION or ASSEMBLY step.

INSPECTION is required.

CLEAN the part or assembly.

PERFORM a mechanical or time MEASUREMENT.

LUBRICATE the part or assembly.

Indicates that a WRENCH or TOOL SIZE will be given.

TIGHTEN to a specific torque.

PERFORM an electrical MEASUREMENT.

Refer to another location in this manual or another publication for additional information.

The component weighs 23 kg [50 lb] or more. To avoid personal injury, use a hoist or get
assistance to lift the component.

Simbolos Usados En Este Manual Section I - Introduction

N14Page i-6

Simbolos Usados En Este Manual

Los si´mbolos siguientes son usados en este manual para clarificar el proceso de las instrucciones. Cuando
aparece uno de estos si´mbolos, su significado se especifica en la parte inferior.

ADVERTENCIA - Serios dan˜os personales o dan˜oa la propiedad puede resultar si las instrucciones
de Advertencia no se consideran.

PRECAUCION - Dan˜os menores pueden resultar, o de piezas del conjunto o el motor puede
averiarse si las instrucciones de Precaucio´n no se siguen.

Indica un paso de REMOCION o DESMONTAJE.

Indica un paso de INSTALACION o MONTAJE.

Se requiere INSPECCION.

LIMPIESE la pieza o el montaje.

EJECUTESE una MEDICION meca´nica o del tiempo.

LUBRIQUESE la pieza o el montaje.

Indica que se dara´ una LLAVE DE TUERCAS oelTAMANx O DE HERRAMIENTA.

APRIETESE hasta un par torsor especi´fico.

EJECUTESE una MEDICION ele´ctrica.

Para informacio´n adicional refie´rase a otro emplazamiento de este manual o a otra publicacio´n
anterior.

El componente pesa 23 kg [50lb] o mas. Para evitar dano corporal empleen unacabria u obtengan
ayuda para elevar el componente.

Section I - Introduction Symboles Utilises Dans Ce Manuel
N14 Page i-7

Symboles Utilises Dans Ce Manuel

Les symboles suivants sont utilise´s dans ce manuel pour aider a` communiquer le but des instructions. Quand l’un
de ces symboles apparaiˆt,ile´voque le sens de´fini ci-dessous:

AVERTISSEMENT - De graves le´sions corporelles ou des dommages mate´riels conside´rables
peuvent survenir si les instructions donne´es sous les rubriques ″Avertissement″ ne sont pas
suivies.

ATTENTION - De petites le´sions corporelles peuvent survenir, ou bien une pie`ce, un ensemble
ou le moteur peuvent eˆtre endommage´s si les instructions donne´es sous les rubriques ″Atten­tion″ ne sont pas suivies.

Indique une ope´ration de DEPOSE.

Indique une ope´ration de MONTAGE.

L’INSPECTION est ne´cessaire.

NETTOYER la pie`ce ou l’ensemble.

EFFECTUER une MESURE me´canique ou de temps.

GRAISSER la pie`ce ou l’ensemble.

Indique qu’une DIMENSION DE CLE ou D’OUTIL sera donne´e.

SERRER a` un couple spe´cifique.

EFFECTUER une MESURE e´lectrique.

Se reporter a` un autre endroit dans ce manuel ou a` une autre publication pour obtenir des
informations plus comple`tes.

Le composant pese 23 kg [50 lb] ou davantage. Pour eviter toute blessure, employer un appariel
de levage ou demander de l’aide pour le soulever.

Symbole Section I - Introduction

N14Page i-8

Symbole

In diesem Handbuch werden die folgenden Symbole verwendet, die wesentliche Funktionen hervorheben. Die
Symbole haben folgende Bedeutung:

WARNUNG - Wird die Warnung nicht beachtet, dann besteht erho¨hte Unfall- und
Bescha¨digungsgefahr.

VORSICHT - Werden die Vorsichtsmassnahmen nicht beachtet, dann besteht Unfall- und
Bescha¨digungsgefahr.

AUSBAU bzw. ZERLEGEN.

EINBAU bzw. ZUSAMMENBAU.

INSPEKTION erforderlich.

Teil oder Baugruppe REINIGEN.

DIMENSION - oder ZEITMESSUNG.

Teil oder Baugruppe O} LEN.

WERKZEUGGRO} SSE wird angegeben.

ANZUG auf vorgeschriebenes Drehmoment erforderlich.

Elektrische MESSUNG DURCHFU} HREN.

Weitere Informationen an anderer Stelle bzw. in anderen Handbu¨chern.

Das teil weigt 23 kg [50 lb] oder mehr. Zur vermeidung von koerperverletzung winde benutzen
oder hilfe beim heben des teils in anspruch nehmen.

Section I - Introduction Illustrations
N14 Page i-9

Illustrations

The illustrations used in this manual are intended to give an example of how to perform the action or the repair
being described. Many of the illustrations are common and will not look exactly like the engine or the parts used
in your application. Most of the illustrations contain symbols to indicate an action required or to indicate an

acceptable (OK) or unacceptable (not OK) condition.

Glossary Of Terms Section I - Introduction

N14Page i-10

Glossary Of Terms

AFC: Air Fuel Control; a device in the PT fuel pump that limits the fuel delivery until

ATDC: After Top Dead Center; refers to the position of the piston or the crankshaft

BDC: Bottom Dead Center; refers to the position of the piston or the crankshaft rod

BTDC: Before Top Dead Center; refers to the position of the piston or the crankshaft

Circumferential Direction: In the direction of a circle in respect to the centerline of a round part or a

Concentricity: A measurement of the difference between the centers of either two or more

CPL: Control Parts List; this listing identifies the specific parts that must be in-

Cummins Sealant: This is a one part Room Temperature Vulcanizing (RTV) silicone rubber, adhe-

there is sufficient intake manifold pressure to allow for complete combustion.

rod journal. The piston is moving downward on the power stroke and intake
stroke.

journal. The piston is at its lowest position in the cylinder.

rod journal. The piston is moving upward on the compression stroke and ex­haust stroke.

bore.

parts or the bores in one part.

stalled on the engine to meet agency certification.

sive and sealant material having high heat and oil resistance, and low com­pression set.

Some of the equivalent products are Marston Lubricants, Hylosil, Dow Corn­ing, Silastic 732, Loctite Superflex, General Electric 1473, and General Elec­tric 1470.

D.C.: Direct Current

Dye Penetrant Method: A method used to check for cracks in a part by using a dye penetrant and a

End Clearance: The clearance in an assembly determined by pushing the shaft in an axial di-

E.S.N.: Engine Serial Number

Hammer: A hand tool consisting of a hard steel head on a handle.

I.D.: Inside Diameter

Loctite 290: A single component, anaerobic, polyester resin, liquid sealant compound that

Loctite 609: A single component anaerobic, liquid adhesive that meets or exceeds the re-

Lubriplate 105: A mineral oil base grease with calcium soap (2 percent to 6 percent), and zinc

developer. Use crack detection kit, Part No. 3375432, or its equivalent.

rection one way and then pushing the shaft the other way.

hardens between closely fitted metal surfaces producing a tough, hard bond
with good characteristics. An equivalent product is Perma-Lok HL 126.

quirements of MIL-R-46082A (MR) TYPE 1.
Some of the equivalent products are Loctite 601 and Permabond HL 138.

oxide (2 percent to 4 percent) additives.

Section I - Introduction Glossary Of Terms
N14 Page i-11

Magnetic Particle Inspec­tion:

A method of checking for cracks in either steel or iron parts. This method re­quires a Magnaflux machine, or an equivalent machine that imparts a mag­netic field on the part being checked.

Mallet: A hand tool consisting of a soft head, either wood, plastic, lead, brass, or

rawhide, on a handle.

MAX: Maximum allowed

MIN: Minimum allowed

No.: Number

O.D.: Outside Diameter

OS: Oversize

Protrusion: The difference in the height between two parts in the assembled state.

STD: Standard

TDC: Top Dead Center; refers to the position of the piston or the crankshaft rod

journal. The piston is at its highest position in the cylinder. The rod journal is
pointing straight up toward the piston.

T.I.R.: Total Indicator Runout; used when measuring the concentricity or the runout.

The T.I.R. refers to the total movement of the needle on a dial indicator, from
the most negative reading to the most positive reading.

Water Pump Grease: A premium high temperature grease that will lubricate antifriction bearings

continually from minus 40°C [minus 40°F] to plus 150°C [plus 350°F].
Some of the greases meeting this requirement are Aeroshell No. 5, Chevron

SRI, Amoco Rykon Premium No. 2, Texaco Premium RB, and Shell Dolium R.
Aeroshell No. 5 is not compatible with the other greases and must not be

mixed. Cummins Engine Company, Inc., uses Aeroshell No. 5 on new engines
and components.

Engine Identification Section I - Introduction

N14Page i-12

Engine Identification

The engine dataplate provides the model identification
and other important information about the engine.

Have the following engine data available when commu­nicating with a Cummins Authorized Repair Location.
The information on the dataplate is mandatory when
sourcing service parts:

1. Engine Serial Number (E.S.N.)

2. Control Parts List (CPL)

3. Model

4. Advertised Horsepower and RPM

ap8plgi

The model name provides the following engine data:

N 14 330 E

CELECT™ Identification

Advertised Horsepower

Displacement (Liters)

Engine Model Designation

Section I - Introduction Engine Diagrams
N14 Page i-13

Engine Diagrams

The following drawings contain information about engine components, filter locations, drain points, and access
locations for instrumentation and engine controls.

The information and configuration of components shown in these drawings are of a general nature. Some
component locations will vary depending on applications and installations.

Engine Diagrams Section I - Introduction

N14Page i-14

Section I - Introduction Engine Diagrams
N14 Page i-15

General Cleaning Instructions Section I - Introduction

N14Page i-16

General Cleaning Instructions

Solvent and Acid Cleaning

Several solvent and acid-type cleanerscan beused toclean the engine parts. Cummins Engine Company,
Inc. does not recommend any specific cleaners. Always follow the cleaner manufacturer’s instructions.

Experience has shown that the best results can be obtained using a cleaner that can be heated to 90 to
95 degrees Celsius [180 to 200 degrees Fahrenheit]. A cleaning tank that provides a constant mixing and
filtering of the cleaning solution will give the best results.

Remove all the gasket material, o-rings, and the depositsof sludge, carbon, etc., with a wire brush or scraper
before putting the parts in a cleaning tank. Be careful not to damage any gasket surfaces. When possible,
steam clean the parts before putting them in the cleaning tank.

Warning: The use of acid can be extremely dangerous to personnel, and can damage the machinery.
Always provide a tank of strong soda water as a neutralizing agent.

Rinse all of the parts in hot water after cleaning. Dry completely with compressed air. Blow the rinse water from
all of the capscrew holes and the oil drillings.

If the parts are not to be used immediately after cleaning, dip them in a suitable rustproofing compound. The
rustproofing compound must be removed from the parts before installation on the engine.

Steam Cleaning

Steam cleaning can be used to remove all types of dirt that can contaminate the cleaning tank. It is the
recommended way to clean the oil drillings.

Warning: Wear protective clothing to prevent personal injury from the high pressure and extreme heat.

Do not steam clean the following parts:

1. Electrical Components

2. Wiring

3. Injectors

4. Fuel Pump

5. Belts and Hoses

6. Bearings

Glass or Plastic Bead Cleaning

Glass or plastic bead cleaning can be used on many engine components to remove carbon deposits. The
cleaning process is controlled by the size of the glass or plastic beads, the operating pressure, and the
cleaning time.

Caution: Do not use glass or plastic bead cleaning on aluminum piston skirts. Do not use glass bead
cleaning on aluminum ring grooves. Small particles of glass or plastic will embed in the aluminum and
result in premature wear. Valves, turbocharger shafts, etc., can also be damaged. Follow the cleaning
directions listed in the procedures.

NOTE: Plastic bead blasting media, Part No. 3822735, can be used to clean aluminum ring grooves. Do not use

any bead blasting media on pin bores or aluminum skirts.

Follow the equipment manufacturer’s cleaning instructions. The following guidelines can be used to adapt to
manufacturer’s instructions:

1. Bead size: - Use U.S. size No. 16-20 forpiston cleaning with plastic bead media, Part No. 3822735.

- Use U.S. size No. 70 for piston domes with glass media.

- Use U.S. size No. 60 for general purpose cleaning with glass media.

2. Operating Pressure: - Glass: Use 620 kPa [90 psi] for general purpose cleaning.

- Plastic: Use 270 kPa [40 psi] for piston cleaning.

3. Steam clean or wash the parts with solvent to remove all of the foreign material and glass or plastic
beads after cleaning. Rinse with hot water. Dry with compressed air.

4. Do not contaminate the wash tanks with glass or plastic beads.

Engine Disassembly and Assembly
N14 Page 0-1

Section 0 - Engine Disassembly and Assembly - Group 00

Section Contents

Page

Accessory Drive - Installation ........................................................................................................................ 0-89

Accessory Drive - Removal ............................................................................................................................ 0-31

Accessory Drive Pulley - Installation .............................................................................................................. 0-97

Accessory Drive Pulley - Removal ................................................................................................................. 0-23

Accessory Drive Seal - Installation ................................................................................................................ 0-96

Accessory Drive Seal - Removal..................................................................................................................... 0-39

Air Compressor - Installation ........................................................................................................................ 0-124

Air Compressor - Removal .............................................................................................................................. 0-30

Air Compressor Coolant Inlet and Outlet Tubes - Installation ..................................................................... 0-135

Air Compressor Coolant Inlet and Outlet Tubes - Removal .......................................................................... 0-22

Alternator - Installation.................................................................................................................................. 0-142

Alternator - Removal ...................................................................................................................................... 0-14

Alternator Belts - Installation and Adjustment ............................................................................................. 0-142

Alternator Belts - Removal ............................................................................................................................. 0-13

Alternator Mounting Bracket - Installation.................................................................................................... 0-142

Alternator Mounting Bracket - Removal ........................................................................................................ 0-14

Cam Follower Assemblies - Installation ........................................................................................................ 0-80

Cam Follower Assemblies - Removal ............................................................................................................ 0-38

Camshaft - Installation ................................................................................................................................... 0-78

Camshaft - Removal ....................................................................................................................................... 0-39

Camshaft Bearing Support - Installation ....................................................................................................... 0-94

Camshaft Bearing Support - Removal ........................................................................................................... 0-38

CELECT™ Actuator Harness - Installation ..................................................................................................... 0-128

CELECT™ Actuator Harness - Removal .......................................................................................................... 0-25

CELECT™ Ambient Air Pressure Sensor - Installation.................................................................................. 0-126

CELECT™ Ambient Air Pressure Sensor - Removal ...................................................................................... 0-28

CELECT™ Boost Pressure Sensor - Installation............................................................................................ 0-121

CELECT™ Boost Pressure Sensor - Removal ................................................................................................ 0-33

CELECT™ Coolant Temperature Sensor - Installation .................................................................................. 0-135

CELECT™ Coolant Temperature Sensor - Removal ....................................................................................... 0-21

CELECT™ ECM Cooling Plate - Installation ................................................................................................... 0-125

CELECT™ ECM Cooling Plate - Removal ........................................................................................................ 0-29

CELECT™ Electronic Control Module (ECM) - Installation ............................................................................ 0-126

CELECT™ Electronic Control Module (ECM) - Removal ................................................................................. 0-28

CELECT™ Engine Position Sensor (EPS) - Installation................................................................................... 0-91

CELECT™ Engine Position Sensor (EPS) - Removal ...................................................................................... 0-31

CELECT™ Intake Air Temperature Sensor - Installation ............................................................................... 0-121

CELECT™ Intake Air Temperature Sensor - Removal .................................................................................... 0-33

CELECT™ Lubricating Oil Pressure Sensor - Installation ............................................................................. 0-126

Engine Disassembly and Assembly

N14Page 0-2

Page

CELECT™ Lubricating Oil Pressure Sensor - Removal .................................................................................. 0-29

CELECT™ Sensor Harness - Installation........................................................................................................ 0-127

CELECT™ Sensor Harness - Removal ............................................................................................................ 0-27

Coolant - Drainage........................................................................................................................................... 0-11

Coolant Filter - Installation............................................................................................................................ 0-147

Coolant Filter - Removal ................................................................................................................................ 0-11

Coolant Inlet Transfer Connection - Installation........................................................................................... 0-140

Coolant Inlet Transfer Connection - Removal ............................................................................................... 0-15

Crankcase Breather - Removal ...................................................................................................................... 0-12

Crankcase Breather Tube - Installation ........................................................................................................ 0-147

Crankshaft - Installation ................................................................................................................................. 0-48

Crankshaft - Removal ..................................................................................................................................... 0-44

Crankshaft Seal, Front - Installation .............................................................................................................. 0-94

Crankshaft Seal, Front - Removal ................................................................................................................... 0-39

Crankshaft Seal, Rear - Installation ............................................................................................................... 0-66

Crankshaft Seal, Rear - Removal ................................................................................................................... 0-20

Cylinder Block - Installation on the Rebuild Stand ....................................................................................... 0-46

Cylinder Block - Removal from the Rebuild Stand ........................................................................................ 0-46

Cylinder Heads - Installation .......................................................................................................................... 0-76

Cylinder Heads - Removal .............................................................................................................................. 0-37

Cylinder Liners - Installation .......................................................................................................................... 0-57

Cylinder Liners - Removal .............................................................................................................................. 0-42

Dipstick Tube and Housing - Installation...................................................................................................... 0-140

Dipstick Tube and Housing - Removal .......................................................................................................... 0-15

Engine - Cleaning ........................................................................................................................................... 0-10

Engine - Covering All Openings.................................................................................................................... 0-148

Engine - Installation on the Rebuild Stand .................................................................................................... 0-16

Engine - Preparation for Cleaning................................................................................................................... 0-10

Engine - Removal From the Rebuild Stand................................................................................................... 0-138

Engine Brake - Adjustment ........................................................................................................................... 0-115

C-Brake....................................................................................................................................................... 0-115

C-Brake - Alternate Method ......................................................................................................................... 0-118

Jacobs Brake .............................................................................................................................................. 0-119

Engine Brake - Installation ............................................................................................................................ 0-115

Engine Brakes - Removal ............................................................................................................................... 0-34

Engine Disassembly and Assembly - General information .............................................................................. 0-9

Assembly ........................................................................................................................................................ 0-9

Disassembly ................................................................................................................................................... 0-9

Engine Disassembly and Assembly - Service Tools ........................................................................................ 0-5

Engine Support Bracket, Front - Installation ................................................................................................ 0-131

Engine Support Bracket, Front - Removal ..................................................................................................... 0-23

Exhaust Manifold - Installation...................................................................................................................... 0-144

Exhaust Manifold - Removal ........................................................................................................................... 0-13

Fan and Fan Spacer - Installation ................................................................................................................. 0-143

Engine Disassembly and Assembly
N14 Page 0-3

Page

Fan and Fan Spacer - Removal ...................................................................................................................... 0-13

Fan Belts - Installation and Adjustment........................................................................................................ 0-137

Fan Belts - Removal ....................................................................................................................................... 0-20

Fan Hub and Fan Hub Support Bracket - Installation................................................................................... 0-136

Fan Hub and Fan Hub Support Bracket - Removal ....................................................................................... 0-21

Flywheel - Installation .................................................................................................................................... 0-72

Bore Alignment - Measurement .................................................................................................................... 0-73

Face Alignment - Measurement .................................................................................................................... 0-75

Flywheel - Removal ........................................................................................................................................ 0-18

Flywheel Housing - Installation ...................................................................................................................... 0-67

Bore Alignment - Measurement .................................................................................................................... 0-68

Face Alignment - Measurement .................................................................................................................... 0-70

Flywheel Housing - Removal ......................................................................................................................... 0-19

Fuel Crossovers - Installation ........................................................................................................................ 0-98

Fuel Crossovers - Removal ............................................................................................................................ 0-37

Fuel Pump - Installation ................................................................................................................................ 0-124

CELECT™ Engines ...................................................................................................................................... 0-124

STC Engines............................................................................................................................................... 0-125

Fuel Pump - Removal ..................................................................................................................................... 0-29

CELECT™ Engines ....................................................................................................................................... 0-29

STC Engines ................................................................................................................................................ 0-30

Fuel Tubing - Installation .............................................................................................................................. 0-123

Fuel Tubing - Removal ................................................................................................................................... 0-31

Gear Cover - Installation ................................................................................................................................ 0-92

Gear Cover - Removal .................................................................................................................................... 0-39

Injection Timing - General Information .......................................................................................................... 0-80

Timing Tool Installation ................................................................................................................................ 0-82

Injector and Valve Adjustment...................................................................................................................... 0-105

CELECT™ Engines ...................................................................................................................................... 0-105

STC Engines............................................................................................................................................... 0-109

Injectors - Installation ................................................................................................................................... 0-100

CELECT™ Engines ..................................................................................................................................... 0-100

STC Engines............................................................................................................................................... 0-101

Injectors - Removal ........................................................................................................................................ 0-35

CELECT™ Engines ....................................................................................................................................... 0-35

STC Engines ................................................................................................................................................ 0-36

Intake Manifold - Installation......................................................................................................................... 0-120

Intake Manifold - Removal ............................................................................................................................. 0-33

Lubricating Oil Cooler Assembly - Installation ............................................................................................. 0-141

Lubricating Oil Cooler Assembly - Removal .................................................................................................. 0-14

Lubricating Oil Filter - Installation ................................................................................................................ 0-147

Lubricating Oil Filter - Removal ..................................................................................................................... 0-11

Lubricating Oil Pan - Installation ................................................................................................................... 0-98

Lubricating Oil Pan - Removal ....................................................................................................................... 0-39

Lubricating Oil Pump - Installation ................................................................................................................ 0-91

Lubricating Oil Pump - Removal ..................................................................................................................... 0-32

Lubricating Oil Pump Signal Line - Installation ............................................................................................ 0-122

Lubricating Oil Pump Signal Line - Removal.................................................................................................. 0-32

Engine Disassembly and Assembly

N14Page 0-4

Page

Lubricating Oil Transfer Tube - Installation.................................................................................................. 0-122

Lubricating Oil Transfer Tube - Removal ...................................................................................................... 0-31

Piston and Connecting Rod Assemblies - Assembly and Installation .......................................................... 0-61

Piston and Connecting Rod Assemblies - Removal ....................................................................................... 0-40

Piston Cooling Nozzles - Installation ............................................................................................................ 0-139

Piston Cooling Nozzles - Removal ................................................................................................................. 0-15

Push Tubes - Installation ............................................................................................................................. 0-102

Push Tubes - Removal ................................................................................................................................... 0-35

Rear Cover - Installation ................................................................................................................................ 0-65

Rear Cover - Removal .................................................................................................................................... 0-20

Rocker Housing Covers - Installation ........................................................................................................... 0-119

Rocker Housing Covers - Removal ................................................................................................................ 0-34

Rocker Lever Housing - Installation .............................................................................................................. 0-98

Rocker Lever Housing - Removal .................................................................................................................. 0-36

Rocker Lever Shaft Assemblies - Installation .............................................................................................. 0-104

Rocker Lever Shaft Assemblies - Removal ................................................................................................... 0-34

Starting Motor - Installation .......................................................................................................................... 0-144

Starting Motor - Removal ............................................................................................................................... 0-13

STC External Oil Plumbing - Installation ...................................................................................................... 0-130

STC External Oil Plumbing - Removal ........................................................................................................... 0-24

STC Oil Control Valve - Installation .............................................................................................................. 0-129

STC Oil Control Valve - Removal ................................................................................................................... 0-25

Thermostat Housing - Installation................................................................................................................. 0-135

Thermostat Housing - Removal ..................................................................................................................... 0-22

Turbocharger - Installation............................................................................................................................ 0-145

Turbocharger - Removal ................................................................................................................................ 0-12

Valve Crossheads - Installation .................................................................................................................... 0-103

Valve Crossheads - Removal ......................................................................................................................... 0-35

Vibration Damper - Installation ..................................................................................................................... 0-131

Vibration Damper - Removal .......................................................................................................................... 0-23

Viscosity Sensor - Installation ...................................................................................................................... 0-121

Viscosity Sensor - Removal ........................................................................................................................... 0-32

Water Header Covers - Installation ............................................................................................................... 0-140

Water Header Covers - Removal .................................................................................................................... 0-16

Water Pump - Installation.............................................................................................................................. 0-133

Water Pump - Removal .................................................................................................................................. 0-23

Water Pump Belt - Installation and Adjustment ........................................................................................... 0-134

Water Pump Belt - Removal ........................................................................................................................... 0-21

Engine Disassembly and Assembly Engine Disassembly and Assembly - Service Tools
N14 Page 0-5

Engine Disassembly and Assembly - Service Tools

The following special tools are recommended to perform procedures in section 1. The use of these
toolsis shown in the appropriate procedure.These tools can bepurchased from your local Cummins
Authorized Repair Location.

Tool No. Tool Description Tool Illustration

Lifting Fixture
Designed to lift all H/NH engines except 5 1/8-inch bore with a

ST-125 or

3822512

top mounted turbocharger.

ST-163

ST-647

ST-669

ST-997

Engine Support Stand

Support engine when not in-chassis or on the engine rebuild
stand.

Standard Puller

Use to remove drive pulleys, impellers, etc.

Torque Wrench Adapter

Tighten crosshead and rocker lever adjusting screws.

Crankshaft Oil Seal Installer

Use to drive the crankshaft oil seal into the rear cover. This tool
also aligns the rear cover to the crankshaft.

ST-1173

Fuel Pump Drive Oil Seal Mandrel

Use to drive the accessorydrive oil sealinto the gear cover while
mounted.

Engine Disassembly and Assembly - Service Tools Engine Disassembly and Assembly

N14Page 0-6

Tool No. Tool Description Tool Illustration

Main Bearing Cap Puller

Remove main bearings caps.

ST-1178

Top Plate

Included in oil seal puller/installer, Part No. ST-1259. Use to pull

ST-1259-1

or install the front crankshaft oil seal.

Belt Tension Gauge

Measure drive belt tension.

ST-1293

ST-1325

3375013

3375049

3375194

Dial Gauge Attachment

Attaches to crankshaft to provide measuring of flywheel housing
runout with a dial indicator.

Adapter Plate

Use the adapter plate to mount the engine to engine rebuild
stand, Part No. 3375194.

Oil Filter Wrench

Use to remove or tighten spin-on lubricating oil filters.

Engine Rebuild Stand

Support cylinder block during engine rebuild. Use with adapter
plate, Part No. 3375013.

3375268

Camshaft Installation Pilots

Use to guide the camshaft though the block camshaft bushings.
Four are required per operation.

Engine Disassembly and Assembly Engine Disassembly and Assembly - Service Tools
N14 Page 0-7

Tool No. Tool Description Tool Illustration

Connecting Rod Guide Pins

Guide connecting rods over crankshaft during removal or in-

3375601

stallation of connecting rods.

Nylon Lifting Sling

Aid in removal andinstallation of crankshaft, flywheel, and other

3375957

heavy components.

Dial Indicator and Sleeve Assembly

Use with dial gauge attachment, Part No. ST-1325, to measure

3376050

flywheel and flywheel housing runout.

3376326

3376592

3376807

3376844

Pulley Installation Tool

Install drive pulleys.

Inch Pound Torque Wrench

Required to make consistent settings of the top stop injectors.
Screwdriver socket, Part No. ST-669-13, must be used with this
tool.

Water and Fuel Filter Wrench

Use to remove the coolant filter and the fuel filter.

Lubrication Suction Tube O-ring Expander

Use to install the lubricating oil transfer tube.

3822524

Belt Tension Gauge

Use to check the belt tension on 3/8-inch to 1/2-inch top width
belts.

Engine Disassembly and Assembly Engine Disassembly and Assembly - General information
N14 Page 0-9

Engine Disassembly and Assembly - General information

These procedures apply to all N14 engines. The differences between engine models due to the application, the
optional equipment on an engine, and the year an engine was built are included in the instructions. Omit the steps
that do not apply to the engine being rebuilt.

1. A warning statement is included for any component or assembly that weighs more than 23 kg [50 lb]. To avoid
personal injury, use a hoist or get assistance from more than one person when removing or installing these
parts.

2. All capscrews used on the N14 engine are U.S. customary.

Disassembly

The instructions in this procedure are organized in a logical sequence to disassemble an engine. This is not the
only sequence to disassemble an engine. Certain parts must be removed in the sequence indicated. Use this

sequence until you become familiar with the engine.
Discard all gaskets (except rocker housing cover gaskets which are reusable), seals, hoses, filters, and o-rings.

Keep these parts if they are needed for a failure analysis.
Label, tag, or mark the parts for location as the parts are removed in order to easily find all of the parts that can

be involved in a failure and to simplify the assembly procedure.
Label, tag, mark or photograph all special equipment prior to the removal from an engine. This engine assembly

procedure does not include the installation of special optional equipment.
Force must be used to remove certain parts. A mallet must be used when force is required. All of the fasteners

must be removed before using force.
Avoid as much dirt as possible during disassembly. The accumulation of additional dirt will make it more difficult

to clean the components.

Assembly

Make sure all thecomponents andassemblies havebeen cleaned,replaced or rebuilt, and areready tobe installed
on the engine before beginning the assembly process.

Torque values arelisted ineach step. If a torquevalue isnot specified, usethe chartlisted in Specifications,Group
18, to determine the correct torque value.

Many of the gaskets and the o-rings are manufactured from a material designed to absorb oil. These gaskets will
enlarge and provide a tight seal after coming in contact with oil. Use ONLY a recommended contact adhesive or
a vegetable-based oil to install these parts.

Always use a capscrew of the samesystem (metric or U.S. customary), the same dimension, and the same grade
as the capscrew removed. The use of a longer, shorter, different grade, or wrong thread capscrew than the
capscrew that is listed can result in damage to the engine.

Engine - Preparation for Cleaning Engine Disassembly (00-01)

N14Page 0-10

Engine Disassembly (00-01)

Engine - Preparation for Cleaning

Warning: The engine lifting equipment must be designed
to safely lift the engine and the transmission as an as­sembly. The dry weight of the standard engine with
accessories is 1256 kg [2770 lbs]. Refer to the equipment
manufacturer’s specifications for the transmission
weight.

Use a correctly rated hoist, and attach engine lifting fix­ture, Part No. ST-125 or Part No. 3822512, to the engine
mounted lifting brackets to remove the engine.

NOTE: If the transmission is not removed, place a support
under the transmission to prevent it from falling.

Installations such as short and medium nose conven­tional chassis, the factory installed rear engine lifting
brackets are usually removed due to space constraints.
In this case, the service rear engine lifting bracket, Part
No. 3823835, will be required to remove the engine from
the chassis.

Refer to the N14 Troubleshooting and Repair Manual,
Bulletin No. 3810456, Section 9, for further information.

Install the engine on two engine support stands, Part No.
ST-163.

Label and remove all electrical wiring and controls.
Install caps or tape on the following openings to prevent

moisture and dirt from entering the engine:

1. Both sides of the turbocharger.

2. All oil, air, water, and fuel openings.

Engine - Cleaning

Warning: When using a steam cleaner, wear protective
clothing and safety glasses or a face shield. Hot steam
can cause serious personal injury.

Use steam to clean the engine, and dry with compressed
air.