Wacker Neuson WM 130 Instrucciones de funcionamiento
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
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.
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