Wacker Neuson WM 130 Operating instructions

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.
Copyright 2006 by Wacker Corporation
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

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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

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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