Wacker Neuson WM 270 User manual

www.wackergroup.com

Engine

WM 130

WM 170

WM 270

REPAIR MANUAL

0159563en 002

1006

0159563EN

WM 130/170/270 Repair Foreword

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Operating / Parts Information

You must be familiar with the operation of this machine before you

attempt to troubleshoot or repair it. Basic operating and maintenance

procedures are described in the Operator’s Manual supplied with the

machine. Keep a copy of the Operator’s Manual with the machine at all

times. Use the separate Parts Book supplied with the machine to order

replacement parts. If you are missing either of the documents, please

contact Wacker Corporation to order a replacement.

Damage caused by misuse or neglect of the unit should be brought to

the attention of the operator to prevent similar occurrences from

happening in the future.

This manual provides information and procedures to safely repair and

maintain the above Wacker model(s). For your own safety and

protection from injury, carefully read, understand, and observe all

instructions described in this manual. THE INFORMATION

CONTAINED IN THIS MANUAL IS BASED ON MACHINES

MANUFACTURED UP TO THE TIME OF PUBLICATION. WACKER

CORPORATION RESERVES THE RIGHT TO CHANGE ANY

PORTION OF THIS INFORMATION WITHOUT NOTICE.

Foreword WM 130/170/270 Repair

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CALIFORNIA

Proposition 65 Warning:

Engine exhaust, some of its constituents, and certain vehicle

components, contain or emit chemicals known to the State of

California to cause cancer and birth defects or other reproductive

harm.

Laws Pertaining to Spark Arresters

Notice: State Health Safety Codes and Public Resources Codes

specify that in certain locations spark arresters be used on internal

combustion engines that use hydrocarbon fuels. A spark arrester is a

device designed to prevent accidental discharge of sparks or flames

from the engine exhaust. Spark arresters are qualified and rated by

the United States Forest Service for this purpose.

In order to comply with local laws regarding spark arresters, consult

the engine distributor or the local Health and Safety Administrator.

All rights, especially copying and distribution rights, are reserved.

No part of this publication may be reproduced in any form or by any

means, electronic or mechanical, including photocopying, without

express written permission from Wacker Corporation.

Any type of reproduction or distribution not authorized by Wacker

Corporation represents an infringement of valid copyrights, and

violators will be prosecuted. We expressly reserve the right to make

technical modifications, even without due notice, which aim at

improving our machines or their safety standards.

WARNING

WM 130/170/270 Repair Table of Contents

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1. Emission Control System Information 5

2. Safety Information 16

2.1 Laws Pertaining to Spark Arresters .................................................... 16

2.2 Operating Safety ................................................................................ 17

2.3 Operator Safety while using Internal Combustion Engines ................ 18

2.4 Service Safety .................................................................................... 19

2.5 Safety Labels ...................................................................................... 20

3. Technical Data 21

4. Operation 22

4.1 Recommended Fuel ........................................................................... 22

4.2 Before Starting ................................................................................... 22

4.3 To Start ............................................................................................... 23

4.4 To Stop ............................................................................................... 23

5. Maintenance 24

5.1 Periodic Maintenance Schedule ......................................................... 24

5.2 Spark Plug .......................................................................................... 25

5.3 Engine Oil ........................................................................................... 26

5.4 Cleaning Fuel Strainer ........................................................................ 26

5.5 Air Cleaner ......................................................................................... 27

5.6 Storage ............................................................................................... 28

6. Theory of Operation 29

6.1 Component Descriptions .................................................................... 29

6.2 Cross Section Across Shaft ................................................................ 34

6.3 Components—Cross Section Across Shaft ........................................ 35

6.4 Cross Section Along Shaft ................................................................. 36

6.5 Components—Cross Section Along Shaft ......................................... 37

Table of Contents WM 130/170/270 Repair

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7. Teardown/Rebuild Procedures 38

7.1 Tools ....................................................................................................38

7.2 Ordering Parts .....................................................................................38

7.3 Reference Numbers ( ) ........................................................................38

7.4 Weight Block .......................................................................................38

8. Disassembly Procedures 39

8.1 Draining Oil ..........................................................................................39

8.2 Removing Air Cleaner .........................................................................40

8.3 Removing Stop Switch, Recoil Starter, and Blower Housing ..............41

8.4 Removing Fuel Tank, Muffler, and Muffler Cover ................................42

8.5 Removing Governor, Carburetor, and Speed Control Lever ...............43

8.6 Removing Ignition Coil, Starter Pulley, and Flywheel ..........................44

8.7 Removing Case Baffle, Charge Coil, and Spark Plug .........................45

8.8 Removing Rocker Cover and Rocker Arm ..........................................46

8.9 Removing Main Bearing Cover ...........................................................47

8.10 Removing Tensioner and Camshaft ....................................................48

8.11 Removing Cylinder Head and Valves ..................................................49

8.12 Removing Connecting Rod and Piston ...............................................50

8.13 Removing Crankshaft and Oil Sensor .................................................51

9. Reassembly Procedures 52

9.1 Notes on Reassembly .........................................................................52

9.2 Oil Sensor ............................................................................................52

9.3 Crankshaft ...........................................................................................53

9.4 Piston and Piston Rings ......................................................................54

9.5 Piston and Connecting Rod .................................................................55

9.6 Connecting Rod ...................................................................................56

9.7 Intake and Exhaust Valves ..................................................................57

9.8 Chain Guide ........................................................................................58

9.9 Cylinder Head ......................................................................................59

9.10 Setting the Timing Chain .....................................................................60

9.11 Mounting the Camshaft on the Cylinder Head ....................................61

9.12 Balancer Shaft Option (WM 270 only) .................................................62

9.13 Main Bearing Cover .............................................................................62

9.14 Mounting Rocker Arms ........................................................................63

9.15 Valve Clearance Adjustment ...............................................................64

WM 130/170/270 Repair Table of Contents

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9.16 Rocker Cover and Spark Plug ............................................................ 65

9.17 Case Baffle ......................................................................................... 66

9.18 Flywheel and Starter Pulley ................................................................ 67

9.19 Ignition Coil ......................................................................................... 67

9.20 Speed Control Assembly and Carburetor ........................................... 68

9.21 Governor Lever .................................................................................. 69

9.22 Air Cleaner Base ................................................................................ 70

9.23 Governor System Adjustment ............................................................ 70

9.24 Muffler ................................................................................................ 71

9.25 Fuel Tank ........................................................................................... 72

9.26 Blower Housing and Recoil Starter .................................................... 73

9.27 Stop Switch ........................................................................................ 74

9.28 Air Cleaner ......................................................................................... 75

9.29 External Inspection ............................................................................. 76

9.30 Engine Oil ........................................................................................... 76

9.31 Filling Engine With Oil ........................................................................ 77

9.32 Break-in Operation ............................................................................. 78

10. Sub Systems 79

10.1 Automatic Decompression System .................................................... 79

10.2 Fuel System Diagram ...................................................................... 80

10.3 Carburetor .......................................................................................... 81

10.4 Carburetor Overhaul ........................................................................... 82

10.5 Carburetor Exploded View ................................................................. 83

10.6 Recoil Starter ...................................................................................... 84

10.7 Checking the Recoil Starter After Reassembly .................................. 88

10.8 Other Starter Checks .......................................................................... 89

11. Electrical 90

11.1 Magneto ............................................................................................. 90

11.2 Inspecting the Magneto ...................................................................... 90

11.3 WM 130/WM170 Ignition Coil Internal Circuit ..................................... 91

11.4 Basic Theory ...................................................................................... 91

11.5 WM 270 Ignition Coil Internal Circuit .................................................. 92

11.6 Ignition Timing Characteristics ........................................................ 92

11.7 WM 270 Basic Theory ........................................................................ 93

11.8 Wiring Diagram ................................................................................... 94

Table of Contents WM 130/170/270 Repair

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12. Clearance Data and Limits Table 95

12.1 Term Descriptions ...............................................................................95

13. Troubleshooting 104

13.1 Troubleshooting Table .......................................................................104

Emission Control System Information

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1. Emission Control System Information

Source of Emissions

The combustion process produces carbon monoxide, oxides of

nitrogen, and hydrocarbons. Control of hydrocarbons and oxides of

nitrogen is very important because, under certain conditions, they

react to form photochemical smog when subjected to sunlight. Carbon

monoxide does not react in the same way, but it is toxic.

Wacker utilizes lean carburetor settings and other systems to reduce

the emissions of carbon monoxide, oxides of nitrogen, and

hydrocarbons.

The U.S. and California Clean Air Acts

EPA and California regulations require all manufacturers to furnish

written instructions describing the operation and maintenance of

emission control systems.

The following instructions and procedures must be followed in order to

keep the emissions from your Wacker engine within the emissions

standards.

Tampering and Altering

Tampering with or altering the emission control system may increase

emissions beyond the legal limit. Among those acts that constitute

tampering are:

•Removal or alteration of any part of the intake, fuel, or exhaust

systems.

•Altering or defeating the speed-adjusting mechanism to cause the

engine to operate outside its design parameters.

Problems That May Affect Emissions

If you are aware of any of the following symptoms, have your engine

inspected and repaired by your servicing dealer.

•Hard starting or stalling after starting.

•Rough idle.

•Misfiring or backfiring under load.

•Afterburning (backfiring).

•Black exhaust smoke or high fuel consumption.

Emission Control System Information

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Replacement Parts

The emission control systems on your Wacker engine were designed,

built, and certified to conform with EPA and California emissions

regulations. We recommend the use of genuine Wacker parts

whenever you have maintenance done. These original-design

replacement parts are manufactured to the same standards as the

original parts, so you can be confident of their performance. The use

of replacement parts that are not of the original design and quality may

impair the effectiveness of your emission control system.

A manufacturer of an aftermarket part assumes the responsibility that

the part will not adversely affect emission performance. The

manufacturer or rebuilder of the part must certify that use of the part

will not result in a failure of the engine to comply with emission

regulations.

Maintenance

Follow the maintenance schedule. Remember that this schedule is

based on the assumption that your machine will be used for its

designed purpose. Sustained high-load or high-temperature operation,

or use in unusually wet or dusty conditions, will require more frequent

service.

OXYGENATED FUELS

Some conventional gasolines are being blended with alcohol or an

ether compound. These gasolines are collectively referred to as

oxygenated fuels. To meet clean air standards, some areas of the

United States and Canada use oxygenated fuels to help reduce

emissions.

If you use an oxygenated fuel, be sure it is unleaded and meets the

minimum octane rating requirement.

Before using an oxygenated fuel, try to confirm the fuel’s contents.

Some States / Provinces require this information to be posted on the

pump.

The following are EPA-approved percentages of oxygenates:

ETHANOL - (ethyl or grain alcohol) 10% by volume. You may use

gasoline containing up to 10% ethanol by volume. Gasoline containing

ethanol may be marketed under the name “Gasohol”.

MTBE - (methyl tertiary butyl ether) 15% by volume. You may use

gasoline containing up to 15% MTBE by volume.

Emission Control System Information

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METHANOL - (methyl or wood alcohol) 5% by volume. You may use

gasoline containing up to 5% methanol by volume, as long as it

contains cosolvents and corrosion inhibitors to protect the fuel system.

Gasoline containing more than 5% methanol by volume may cause

starting and/or performance problems. It may also damage metal,

rubber, and plastic parts of your fuel system.

If you notice any undesirable operating symptoms, try another service

station, or switch to another brand of gasoline.

Fuel system damage or performance problems resulting from the use

of an oxygenated fuel containing more than the percentages of

oxygenates mentioned above are not covered under warranty.

Emission Control System Information

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EMISSIONS COMPONENT DEFECT WARRANTY COVERAGE

This emission warranty is applicable in all States, except the State of

California.

Wacker Corporation, N92 W15000 Anthony Avenue, Menomonee

Falls, WI 53051-1504, (herein "Wacker") warrant(s) to the initial retail

purchaser and each subsequent owner, that this non-road engine

(herein "engine") has been designed, built, and equipped to conform

at the time of initial sale to all applicable regulations of the U.S.

Environmental Protection Agency (EPA), and that the engine is free of

defects in materials and workmanship which would cause this engine

to fail to conform with EPA regulations during its warranty period.

For the components listed under PARTS COVERED, the service

dealer authorized by Wacker will, at no cost to you, make the

necessary diagnosis, repair, or replacement necessary to ensure that

the engine complies with applicable U.S. EPA regulations.

EMISSISON COMPONENT DEFECT WARRANTY PERIOD

The warranty period for this engine begins on the date of sale to the

initial purchaser and continues for a period of 2 years.

Emission Control System Information

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PARTS COVERED

Listed below are the parts covered by the Emission Components

Defect Warranty. Some of the parts listed below may require

scheduled maintenance and are warranted up to the first scheduled

replacement point for that part.

(1) Fuel Metering System

(i) Carburetor and internal parts (and/or pressure regulator or fuel

injection system).

(ii) Air/fuel ratio feedback and control system, if applicable.

(iii) Cold start enrichment system, if applicable.

(iv) Regulator assembly (gaseous fuel, if applicable) .

(2) Air Induction System

(i) Intake manifold, if applicable.

(ii) Air filter.

(3) Ignition System

(i) Spark plugs.

(ii) Magneto or electronic ignition system.

(iii) Spark advance/retard system, if applicable.

(4) Exhaust manifold, if applicable

(5) Miscellaneous Items Used in Above Systems

(i) Electronic controls, if applicable.

(ii) Hoses, belts, connectors, and assemblies.

(iii) Filter lock assembly (gaseous fuel, if applicable).

Emission Control System Information

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OBTAINING WARRANTY SERVICE

To obtain warranty service, take your engine to the nearest authorized

Wacker service dealer. Bring your sales receipts indicating date of

purchase for this engine. The service dealer authorized by Wacker will

perform the necessary repairs or adjustments within a reasonable

amount of time and furnish you with a copy of the repair order. All parts

and accessories replaced under this warranty become the property of

Wacker.

WHAT IS NOT COVERED

• Conditions resulting from tampering, misuse, improper adjust-

ment (unless they were made by the service dealer authorized by

Wacker during a warranty repair), alteration, accident, failure to

use the recommended fuel and oil, or not performing required

maintenance services.

• The replacement parts used for required maintenance services.

• Consequential damages such as loss of time, inconvenience,

loss of use of the engine or equipment, etc.

• Diagnosis and inspection charges that do not result in warranty-

eligible service being performed.

• Any non-authorized replacement part, or malfunction of autho-

rized parts due to use of non-authorized parts.

OWNER'S WARRANTY RESPONSIBILITIES

As the engine owner, you are responsible for the performance of the

required maintenance listed in your owner's manual. Wacker

recommends that you retain all receipts covering maintenance on your

engine, but Wacker cannot deny warranty solely for the lack of receipts

or for your failure to ensure the performance of all scheduled

maintenance. As the engine owner, you should however be aware that

Wacker may deny warranty coverage if your engine or a part has failed

due to abuse, neglect, improper maintenance or unapproved

modifications.

You are responsible for presenting your engine to the nearest service

dealer authorized by Wacker when a problem exists.

If you have any questions regarding your warranty rights and

responsibilities, you should contact the WACKER CORPORATION

Product Support Department (U.S.A. 1-800-770-0957, Canada 1-877-

977-0775) for the information.

Emission Control System Information

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THINGS YOU SHOULD KNOW ABOUT THE EMISSION CONTROL

SYSTEM WARRANTY:

MAINTENANCE AND REPAIRS

You are responsible for the proper maintenance of the engine. You

should keep all receipts and maintenance records covering the

performance of regular maintenance in the event questions arise.

These receipts and maintenance records should be transferred to

each subsequent owner of the engine. Wacker reserves the right to

deny warranty coverage if the engine has not been properly

maintained. Warranty claims will not be denied, however, solely

because of the lack of required maintenance or failure to keep

maintenance records.

MAINTENANCE, REPLACEMENT OR REPAIR OF EMISSION

CONTROL DEVICES AND SYSTEMS MAY BE PERFORMED BY

ANY REPAIR ESTABLISHMENT OR INDIVIDUAL; HOWEVER,

WARRANTY REPAIRS MUST BE PERFORMED BY A SERVICE

DEALER AUTHORIZED BY WACKER. THE USE OF PARTS THAT

ARE NOT EQUIVALENT IN PERFORMANCE AND DURABILITY TO

AUTHORIZED PARTS MAY IMPAIR THE EFFECTIVENESS OF THE

EMISSION CONTROL SYSTEM AND MAY HAVE A BEARING ON

THE OUTCOME OF A WARRANTY CLAIM.

If other than the parts authorized by Wacker are used for maintenance

replacements or for the repair of components affecting emission

control, you should assure yourself that such parts are warranted by

their manufacturer to be equivalent to the parts authorized by Wacker

in their performance and durability.

HOW TO MAKE A CLAIM

All repair qualifying under this limited warranty must be performed by

a service dealer authorized by Wacker. In the event that any emission-

related part is found to be defective during the warranty period, you

shall notify WACKER CORPORATION Product Support Department

(U.S.A. 1-800-770-0957, Canada 1-877-977-0775) and you will be

advised of the appropriate warranty service dealer or service providers

where the warranty repair can be performed.

CALIFORNIA EMISSION CONTROL WARRANTY STATEMENT

YOUR WARRANTY RIGHTS AND OBLIGATIONS

The California Air Resources Board and Wacker Corporation (herein

“Wacker”) are pleased to explain the emissions control system

warranty on your small off-road engine. In California, new small off-

road engines must be designed, built and equipped to meet the State's

stringent anti-smog standards. Wacker Corporation must warrant the

emissions control system on your engine for the periods of time listed

below provided there has been no abuse, neglect or improper

maintenance of your engine.

Emission Control System Information

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Your emission control system may include parts such as the carburetor

or fuel-injection system, fuel lines and the ignition system. Also

included may be hoses, clamps, connectors and other associated

components.

Where a warrantable condition exists, a Wacker authorized service

center will repair your Wacker engine at no cost to you including

diagnosis, parts and labor.

MANUFACTURER'S WARRANTY COVERAGE:

The emissions control system is warranted for two years. If any

emissions-related part on your engine is defective, the part will be

repaired or replaced by Wacker.

OWNER'S WARRANTY RESPONSIBILITIES:

As the Wacker engine owner, you are responsible for the performance

of the required maintenance listed in your owner's manual. Wacker

recommends that you retain all receipts covering maintenance on your

Wacker engine, but Wacker cannot deny warranty solely for the lack of

receipts.

As the Wacker engine owner, you should however be aware that

Wacker may deny you warranty coverage if your Wacker engine or a

part has failed due to abuse, neglect, improper maintenance or

unapproved modifications.

You are responsible for presenting your Wacker engine to a Wacker

dealer or service center as soon as a problem exists. The warranty

repairs should be completed in a reasonable amount of time, not to

exceed 30 days.

If you have any questions regarding your warranty rights and

responsibilities, you should contact your local Wacker equipment

dealer, service center or the WACKER CORPORATION Product

Support Department (U.S.A. 1-800-770-0957, Canada 1-877-977-

0775) for the information.

Emission Control System Information

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GENERAL EMISSIONS WARRANTY COVERAGE

- California Only -

Wacker warrants to the ultimate purchaser and each subsequent

purchaser that this small off-road engine (1) has been designed, built

and equipped so as to conform with all applicable regulations; and (2)

is free from defects in materials and workmanship that cause the

failure of a warranted part to conform with those regulations as may be

applicable to the terms and conditions stated below.

A. The warranty period begins on the date the engine is delivered to an

ultimate purchaser or first placed into service. The warranty period is

two years.

B. Subject to certain conditions and exclusions as stated below, the

warranty on emissions related parts is as follows:

1) Any warranted part that is not scheduled for replacement as

required maintenance in your owner’s manual is warranted for the

warranty period stated above. If the part fails during the period of

warranty coverage, the part will be repaired or replaced by

Wacker according to subsection (4) below. Any such part

repaired or replaced under warranty will be warranted for the

remainder of the period.

2) Any warranted part that is scheduled only for regular inspection

in your owner’s manual is warranted for the warranty period

stated above. Any such part repaired or replaced under warranty

will be warranted for the remaining warranty period.

3) Any warranted part that is scheduled for replacement as required

maintenance in your owner’s manual is warranted for the period

of time before the first scheduled replacement date for that part.

If the part fails before the first scheduled replacement, that part

will be repaired or replaced by Wacker according to subsection

(4) below. Any such part repaired or replaced under warranty will

be warranted for the remainder of the period prior to the first

scheduled replacement point for the part.

4) Repair or replacement of any warranted part under the warranty

provisions herein must be performed at a warranty station at no

charge to the owner.

5) Notwithstanding the provisions herein, warranty services or repair

will be provided at all of our distribution centers that are

franchised to service the subject engines.

6) The owner must not be charged for diagnostic labor that leads to

the determination that a warranted part is in fact defective,

provided that such diagnostic work is performed at a warranty

station.

Emission Control System Information

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7) Wacker is liable for damages to other engine components

proximately caused by a failure under warranty of any warranted

part.

8) Throughout the engine warranty period stated above, Wacker will

maintain a supply of warranted parts sufficient to meet the

expected demand for such parts.

9) Any replacement part may be used in the performance of any

warranty maintenance or repairs and must be provided without

charge to the owner. Such use will not reduce the warranty

obligations of Wacker.

10) Add-on or modified parts that are not exempted by the Air

Resources Board may not be used. The use of any non-

exempted add-on or modified parts by the ultimate purchaser will

be grounds for disallowing a warranty claim. Wacker will not be

liable to warrant failures of warranted parts caused by the use of

a non-exempted add-on or a modified part.

Emission Control System Information

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C. Warranted Parts:

The repair or replacement of any warranted part otherwise eligible for

warranty coverage may be excluded from such warranty coverage if

Wacker demonstrates that the engine has been abused, neglected, or

improperly maintained, and that such abuse, neglect, or improper

maintenance was the direct cause of the need for repair or

replacement of the part. That notwithstanding, any adjustment of a

component that has a factory installed, and properly operating,

adjustment limiting device is still eligible for warranty coverage. The

following emissions warranty parts list are covered.

1) Fuel Metering System

i) Carburetor and internal parts (and/or pressure regulator or fuel

injection system).

ii) Air/fuel ratio feedback and control system, if applicable.

iii) Cold start enrichment system, if applicable.

iv) Regulator assembly (gaseous fuel, if applicable)

2) Air Induction System

i) Intake manifold, if applicable.

ii) Air filter

3) Ignition System

i) Spark plugs

ii) Magneto or electronic ignition system

iii) Spark advance/retard system, if applicable

4) Exhaust manifold, if applicable

5) Evaporation System

i) Fuel line

ii) Fuel line fittings

Safety Information WM 130/170/270

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2. Safety Information

This manual contains DANGER, WARNING, CAUTION, NOTICE and

NOTE callouts which must be followed to reduce the possibility of

personal injury, damage to the equipment, or improper service.

This is the safety alert symbol. It is used to alert you to potential

personal injury hazards. Obey all safety messages that follow this

symbol to avoid possible injury or death.

DANGER indicates a hazardous situation which, if not avoided, will

result in death or serious injury.

WARNING indicates a hazardous situation which, if not avoided, could

result in death or serious injury.

CAUTION indicates a hazardous situation which, if not avoided, could

result in minor or moderate injury.

NOTICE: Used without the safety alert symbol, NOTICE indicates a

hazardous situation which, if not avoided, could result in property

damage

Note: Contains additional information important to a procedure.

2.1 Laws Pertaining to Spark Arresters

Notice: State Health Safety Codes and Public Resources Codes

specify that in certain locations spark arresters be used on internal

combustion engines that use hydrocarbon fuels. A spark arrester is a

device designed to prevent accidental discharge of sparks or flames

from the engine exhaust. Spark arresters are qualified and rated by

the United States Forest Service for this purpose.

In order to comply with local laws regarding spark arresters, consult

the engine distributor or the local Health and Safety Administrator.

DANGER

WARNING

CAUTION

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Wacker Neuson WM 270 User manual

Wacker Neuson WM 270 User manual

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