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WM 170
Wacker Neuson WM 170 Repair Manual
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Clearance Data and Limits Table
WM 130/170/270 Repair
wc_tx000385gb.fm
96
Item
Model
Standar
d
mm (in.
)
Limit
mm (in.)
Cylinder head
WM 130
WM 170
WM 270
0.05 or less
(0.002)
0.1
(0.004)
Intake/
e
xhaust v
alv
e
contact width
WM 130
WM 170
WM 270
0.7–1.0
(0.0276–
0.0394)
---
Intake
e
xhaust
WM 130
WM 170
WM 270
5.500–5.518
(0.2165–
0.2172)
---
Ro
cke
r
a
r
m-
pin outer
diameter
D
1
, D
2
WM 130
WM 170
WM 270
5.945–5.980
(0.234–0.235)
5.9
(0.232)
Ro
cke
r
a
r
m
pin suppor
t
inner diameter
D
3
, D
4
WM 130
WM 170
WM 270
6.00–6.018
(0.236–0.237)
6.05
(0.238)
99
101
Table of Contents
Default Chapter
5
Table of Contents
5
1 Emission Control System Information
9
2 Safety Information
20
Laws Pertaining to Spark Arresters
20
Operating Safety
21
Operator Safety While Using Internal Combustion Engines
22
Service Safety
23
Safety Labels
24
3 Technical Data
25
4 Operation
26
Recommended Fuel
26
Before Starting
26
To Start
27
To Stop
27
5 Maintenance
28
Periodic Maintenance Schedule
28
Spark Plug
29
Engine Oil
30
Cleaning Fuel Strainer
30
Air Cleaner
31
Storage
32
6 Theory of Operation
33
Component Descriptions
33
Cross Section Across Shaft
38
Components-Cross Section Across Shaft
39
Cross Section Along Shaft
40
Components-Cross Section Along Shaft
41
7 Teardown/Rebuild Procedures
42
Tools
42
Ordering Parts
42
Reference Numbers ( )
42
Weight Block
42
8 Disassembly Procedures
43
Draining Oil
43
Removing Air Cleaner
44
Removing Stop Switch, Recoil Starter, and Blower Housing
45
Removing Fuel Tank, Muffler, and Muffler Cover
46
Removing Governor, Carburetor, and Speed Control Lever
47
Removing Ignition Coil, Starter Pulley, and Flywheel
48
Removing Case Baffle, Charge Coil, and Spark Plug
49
Removing Rocker Cover and Rocker Arm
50
Removing Main Bearing Cover
51
Removing Tensioner and Camshaft
52
Removing Cylinder Head and Valves
53
Removing Connecting Rod and Piston
54
Removing Crankshaft and Oil Sensor
55
9 Reassembly Procedures
56
Notes on Reassembly
56
Oil Sensor
56
Crankshaft
57
Piston and Piston Rings
58
Piston and Connecting Rod
59
Connecting Rod
60
Intake and Exhaust Valves
61
Chain Guide
62
Cylinder Head
63
Setting the Timing Chain
64
Mounting the Camshaft on the Cylinder Head
65
Balancer Shaft Option (WM 270 Only)
66
Main Bearing Cover
66
Mounting Rocker Arms
67
Valve Clearance Adjustment
68
Rocker Cover and Spark Plug
69
Case Baffle
70
Flywheel and Starter Pulley
71
Ignition Coil
71
Speed Control Assembly and Carburetor
72
Governor Lever
73
Air Cleaner Base
74
Governor System Adjustment
74
Muffler
75
Fuel Tank
76
Blower Housing and Recoil Starter
77
Stop Switch
78
Air Cleaner
79
External Inspection
80
Engine Oil
80
Filling Engine with Oil
81
Break-In Operation
82
10 Sub Systems
83
Automatic Decompression System
83
Fuel System Diagram
84
Carburetor
85
Carburetor Overhaul
86
Carburetor Exploded View
87
Recoil Starter
88
Checking the Recoil Starter after Reassembly
92
Other Starter Checks
93
11 Electrical
94
Magneto
94
Inspecting the Magneto
94
WM 130/WM170 Ignition Coil Internal Circuit
95
Basic Theory
95
WM 270 Ignition Coil Internal Circuit
96
Ignition Timing Characteristics
96
WM 270 Basic Theory
97
Wiring Diagram
98
12 Clearance Data and Limits Table
99
Term Descriptions
99
13 Troubleshooting
108
Troubleshooting Table
108
Torque Values
115
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Wacker Neuson WM 170 Specifications
General
Brand
Wacker Neuson
Model
WM 170
Category
Engine
Language
English
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