Wacker Neuson WM 130 Repair Manual
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Wacker Neuson WM 130 Repair Manual

Wacker Neuson WM 130 Repair Manual

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See also: Repair Manual , Operator's Manual
Repair Manual
Engine
WM 130
WM 170
WM 270
EN
5000192069
03
0313
5
0
0
0
1
9
2
0
6
9

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Summary of Contents for Wacker Neuson WM 130

  • Page 1 Repair Manual Engine WM 130 WM 170 WM 270 5000192069 0313...
  • Page 2 Wacker Neuson Production Americas LLC. Any type of reproduction or distribution not authorized by Wacker Neuson Production Americas LLC represents an infringement of valid copyrights. Violators will be prosecuted.

  • Page 3: Foreword

    Use the separate Parts Book supplied with the machine to order replacement parts. If you are missing any of these documents, please contact Wacker Neuson to order a replacement or visit www.wackerneuson.com. When ordering parts or requesting service information, be prepared to provide the machine model number, item number, revision number, and serial number.
  • Page 4 Foreword WM 130 / 170 / 270 Contact your Wacker Neuson dealer immediately if you have questions about approved or unapproved parts, attachments, or modifications. wc_tx003288gb.fm...

  • Page 5: Table Of Contents

    Storage ....................21 Technical Data Emission Control Systems Information and Warranty Emission Control System Background Information ......23 Limited Defect Warranty for Wacker Neuson Emission Control Systems ....................24 Theory of Operation Component Descriptions ..............28 Cross Section Across Shaft ..............33 Components—Cross Section Across Shaft ........
  • Page 6 Table of Contents WM 130/170/270 Teardown/Rebuild Procedures Tools ....................37 Ordering Parts ..................37 Reference Numbers ( ) ................37 Disassembly Procedures Draining Oil ..................38 Removing Air Cleaner .................39 Removing Stop Switch, Recoil Starter, and Blower Housing ....40 Removing Fuel Tank, Muffler, and Muffler Cover ........41 Removing Governor, Carburetor, and Speed Control Lever ....42...
  • Page 7 Other Starter Checks ................89 11 Electrical 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 ............
  • Page 8 Table of Contents WM 130/170/270 13 Troubleshooting 13.1 Troubleshooting Table ...............104 wc_br5000192069_03TOC.fm...

  • Page 9: Safety Information

    WM 130 / 170 / 270 Safety Information Safety Information This manual contains DANGER, WARNING, CAUTION, NOTICE, and NOTE signal words 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.

  • Page 10: Operating Safety

    These areas get hot and may cause burns. 1.1.3 Do not use accessories or attachments that are not recommended by Wacker Neuson. Damage to equipment and injury to the user may result. 1.1.4 Do not leave the machine running unattended.
  • Page 11 WM 130 / 170 / 270 Safety Information DANGER Exhaust gas from the engine contains carbon monoxide, a deadly poison. Exposure to carbon monoxide can kill you in minutes. NEVER operate the machine inside an enclosed area, such as a tunnel, unless adequate ventilation is provided through such items as exhaust fans or hoses.

  • Page 12: Service Safety

    Safety Information WM 130 / 170 / 270 Service Safety A poorly maintained machine can become a safety hazard! In order for the machine to operate safely and properly over a long period of time, periodic maintenance and occasional repairs are necessary.

  • Page 13: Safety Labels

    WM 130 / 170 / 270 Safety Information Safety Labels Wacker Neuson machines use international pictorial labels where needed. These labels are described below. Label Meaning Read the Operator’s Manual for machine information. WARNING! Hot surface DANGER! Engines emit carbon monoxide; operate only in well-ventilated area.

  • Page 14: Operation

    Before using an oxygenated fuel, confirm the fuel's contents. Some states and provinces require this information to be posted on the fuel pump. The following is the Wacker Neuson approved percentage of oxygenates: - (ethyl or grain alcohol) 10% by volume. You may use...

  • Page 15: To Start

    WM 130 / 170 / 270 Operation To Start See Graphic: wc_gr000655 2.3.1 Open fuel valve by moving lever down (a1). Note: If engine is cold, move choke lever to close position (d2). If engine is hot, set choke to open position (d1).

  • Page 16: Maintenance

    Wacker Neuson. The use of service 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.

  • Page 17: Spark Plug

    WM 130 / 170 / 270 Maintenance Spark Plug See Graphic: wc_gr000028 Clean or replace spark plug as needed to ensure proper operation. The muffler becomes very hot during operation and remains hot for a while after stopping the engine. Do not touch the muffler while it is hot.

  • Page 18: Engine Oil

    Maintenance WM 130 / 170 / 270 Engine Oil See Graphic: wc_gr000087 3.4.1 Drain oil while engine is still warm. Note: In the interests of environmental protection, place a plastic sheet and a container under the machine to collect any liquid which drains off.

  • Page 19: Cleaning The Fuel Strainer

    WM 130 / 170 / 270 Maintenance Cleaning the Fuel Strainer 3.5.1 To remove water and dirt, close the fuel lever and remove the fuel strainer. 3.5.2 Inspect the fuel strainer (a) for water and dirt. 3.5.3 After removing any dirt and water, wash the fuel cup with a nonflammable solvent.

  • Page 20: Servicing The Air Cleaner

    Maintenance WM 130 / 170 / 270 Servicing the Air Cleaner Do not use gasoline or other types of low-flash point solvents for cleaning the air cleaner. A fire or explosion could result. WARNING Do not run the engine without the air cleaner. Severe engine NOTICE: damage will occur.

  • Page 21: Storage

    WM 130 / 170 / 270 Maintenance Storage If machine is being stored for more than 30 days: 3.7.1 Drain fuel from tank. Start engine and run until remaining fuel is used. 3.7.2 Remove spark plug. Pour approximately 5 cc of clean SAE 10W30 engine oil into cylinder through spark plug opening.

  • Page 22: Technical Data

    Technical Data WM 130 / 170 / 270 Technical Data WM 130 WM 170 WM 270 Engine Type 4-stroke, overhead valve, single cylinder Engine Make Wacker Rated Power 3.2 (4.3) 4.2 (5.7) 6.6 (9.0) kW (Hp) Displacement 126 (7.69) 169 (10.31) 265 (16.17)

  • Page 23: Emission Control Systems Information And Warranty

    Carbon monoxide does not react in the same way, but it is toxic. Wacker Neuson utilizes lean carburetor settings and other systems to reduce the emissions of carbon monoxide, oxides of nitrogen, and hydrocarbons. Evaporative Emissions...

  • Page 24: Limited Defect Warranty For Wacker Neuson Emission Control Systems

    Tampering and Altering Tampering with or altering the emission control system may increase emissions beyond the legal limit. If evidence of tampering is found, Wacker Neuson may deny a warranty claim. Among those acts that constitute tampering are: Removing or altering of any part of the air intake, fuel, or exhaust systems.
  • Page 25 Emission Control Systems Information and Warranty For the components listed in the following table, an authorized Wacker Neuson dealer/service center will, at no cost to you, make the necessary diagnosis, repair, or replacement necessary to ensure that the engine/equipment complies with the applicable EPA regulations.
  • Page 26 Emission Control Systems Information and Warranty Evaporative Emissions Systems Covered Components Evaporative control system Fuel tank (if applicable) Fuel tank cap (if applicable) Fuel line (if applicable) Fuel line fittings (if applicable) Clamps (if applicable) Carbon canister (if applicable) Purge port connector (if applicable) Miscellaneous parts associated with the Clamps evaporative emission control system...
  • Page 27 For owners located more than 100 miles from an authorized dealer/service center (excluding the states with high-altitude areas as identified in 40 CFR Part 1068, Appendix III), Wacker Neuson will pay for pre-approved shipping costs to and from an authorized Wacker Neuson dealer/service center.

  • Page 28: Theory Of Operation

    Theory of Operation WM 130/170/270 Theory of Operation Component Descriptions Component Illustration Component Description Cylinder and crankcase The cylinder and crankcase are die-cast in alu- minum as a single piece. A special cast iron cylinder liner is molded into the aluminum die- casting.
  • Page 29 WM 130/170/270 Theory of Operation Component Illustration Component Description Cooling system The engine uses a forced-air cooling system in which a cooling fan (which also works as a fly- wheel) forces cooling air into the cylinder and cylinder head. Baffles are provided to guide the flow of the cooling air.
  • Page 30 Theory of Operation WM 130/170/270 Component Illustration Component Description Cylinder head The cylinder head is an aluminum die-casting. The intake and exhaust ports are arranged in a cross direction to improve combustion effi- ciency. Governor system The engine is equipped with a centrifugal fly-...
  • Page 31 WM 130/170/270 Theory of Operation Component Illustration Component Description Ignition system The ignition system is a transistor-controlled magneto system with the ignition timing set at 23° before top dead center. The magneto con- sists of an ignition coil (a) and flywheel (b).
  • Page 32 Theory of Operation WM 130/170/270 Component Illustration Component Description Decompression system The automatic decompression system is mounted on the camshaft. It opens the exhaust valve before the compression top, thereby alleviating the compression pressure and reducing the force required to pull the recoil starter.

  • Page 33: Cross Section Across Shaft

    WM 130/170/270 Theory of Operation Cross Section Across Shaft wc_tx000378gb.fm...

  • Page 34: Components-Cross Section Across Shaft

    Theory of Operation WM 130/170/270 Components—Cross Section Across Shaft Ref. Description Ref. Description Tank cap Oil sensor Governor shaft Charge coil Governor lever Flywheel Governor gear Recoil starter Crankshaft Starter pulley Connecting rod Blower housing Main bearing cover Fuel tank...

  • Page 35: Cross Section Along Shaft

    WM 130/170/270 Theory of Operation Cross Section Along Shaft wc_tx000378gb.fm...

  • Page 36: Components-Cross Section Along Shaft

    Theory of Operation WM 130/170/270 Components—Cross Section Along Shaft Ref. Description Ref. Description Chain guide Connecting rod Piston Oil sensor Muffler cover Crankshaft Muffler Crankcase Exhaust valve Oil drain plug Rocker arm Oil gauge Camshaft Chain Intake valve Governor gear...

  • Page 37: Teardown/Rebuild Procedures

    If the original Parts Book has been lost, a replacement may be ordered from Wacker Neuson. When ordering a replacement Parts Book, please list the model number, item number, revision level, and serial number of the machine. Parts Books are also available on the Wacker Neuson Web site.

  • Page 38: Disassembly Procedures

    Disassembly Procedures WM 130/170/270 Repair Disassembly Procedures Draining Oil See Graphic: wc_gr001750 Note: In the interests of environmental protection, place plastic sheeting and a container under the machine to collect the liquid which drains off. Dispose of this liquid properly.

  • Page 39: Removing Air Cleaner

    WM 130/170/270 Repair Disassembly Procedures Removing Air Cleaner See Graphic: wc_gr001751 8.2.1 Remove M6 flange bolt (a) and the two M6 flange nuts (b). 8.2.2 Remove the air cleaner while pulling the breather pipe (c) away from the rocker cover.

  • Page 40: Removing Stop Switch, Recoil Starter, And Blower Housing

    Disassembly Procedures WM 130/170/270 Repair Removing Stop Switch, Recoil Starter, and Blower Housing See Graphic: wc_gr001752 8.3.1 Remove the two M4 screws (a), disconnect wire, and remove the stop switch (b). 8.3.2 Remove the four M6 bolts (c) and remove the recoil starter (d).

  • Page 41: Removing Fuel Tank, Muffler, And Muffler Cover

    WM 130/170/270 Repair Disassembly Procedures Removing Fuel Tank, Muffler, and Muffler Cover See Graphic wc_gr001753 8.4.1 Remove any remaining fuel by using the carburetor drain (a). Dispose of fuel in proper manner. 8.4.2 Remove the M6 mounting nuts (b) and M6 bolt (c).

  • Page 42: Removing Governor, Carburetor, And Speed Control Lever

    Disassembly Procedures WM 130/170/270 Repair Removing Governor, Carburetor, and Speed Control Lever See Graphic: wc_gr001763 8.5.1 Loosen, but do not remove, the bolt securing the governor lever (a) to the governor shaft (b). 8.5.2 Remove the governor spring (c). 8.5.3 Remove the governor rod and the rod spring (d).

  • Page 43: Removing Ignition Coil, Starter Pulley, And Flywheel

    WM 130/170/270 Repair Disassembly Procedures Removing Ignition Coil, Starter Pulley, and Flywheel See Graphic: wc_gr001764 8.6.1 Remove the spark plug cap (a) from the spark plug. Remove the screws (b) securing the ignition coil (i) and remove the ignition coil.

  • Page 44: Removing Case Baffle, Charge Coil, And Spark Plug

    Disassembly Procedures WM 130/170/270 Repair Removing Case Baffle, Charge Coil, and Spark Plug See Graphic: wc_gr001765 8.7.1 Remove the screw (a) securing the case baffle (b) and remove the case baffle. 8.7.2 If equipped, remove the M6 screw (c) securing the clamp (d) and remove the clamp.

  • Page 45: Removing Rocker Cover And Rocker Arm (Older)

    WM 130/170/270 Repair Disassembly Procedures Removing Rocker Cover and Rocker Arm (older) See Graphic: wc_gr001766 8.8.1 Remove the M6 bolts (a) securing the rocker cover (b) and remove the rocker cover. Remove the rocker cover gasket (c). 8.8.2 Remove the rocker arm pin (d) and both exhaust-valve-side (e) and intake-valve-side (f) rocker arms at compression top dead center (g).

  • Page 46: Removing Rocker Cover And Rocker Arm (Newer)

    Disassembly Procedures WM 130/170/270 Repair Removing Rocker Cover and Rocker Arm (newer) See Graphic: wc_gr001766 8.9.1 Remove the M6 bolts (a) securing the rocker cover (b) and remove the rocker cover. Remove the rocker cover gasket (c). 8.9.2 Remove the rocker arm pin (d) and both exhaust-valve-side (e) and intake-valve-side (f) rocker arms at compression top dead center.

  • Page 47: Removing Main Bearing Cover

    WM 130/170/270 Repair Disassembly Procedures 8.10 Removing Main Bearing Cover See Graphic: wc_gr001767 8.10.1 Remove the six M8 bolts (a) securing the main bearing cover (b). If necessary, tap the main bearing cover with a rubber mallet (c) to loosen it.

  • Page 48: Removing Tensioner And Camshaft

    Disassembly Procedures WM 130/170/270 Repair 8.11 Removing Tensioner and Camshaft See Graphic: wc_gr001768 8.11.1 Remove the tensioner pin (a), tensioner spring (b), and the tensioner (c). 8.11.2 Remove M6 camshaft pin retaining bolt (d). Remove the camshaft pin (e). Be careful not to damage the pin’s O-ring.

  • Page 49: Removing Cylinder Head And Valves

    WM 130/170/270 Repair Disassembly Procedures 8.12 Removing Cylinder Head and Valves See Graphic: wc_gr001769 8.12.1 Remove the M8 bolts (a) securing the cylinder head (b) to the crankcase and remove the cylinder head. Also remove the cylinder head gasket (c). Be careful not to lose the guide pins (d).

  • Page 50: Removing Connecting Rod And Piston

    Disassembly Procedures WM 130/170/270 Repair 8.13 Removing Connecting Rod and Piston See Graphic: wc_gr001770 8.13.1 Scrape off any carbon from the cylinder and the piston head (a). Remove the two M6 connecting rod bolts (b) and remove the connecting rod cap (c).

  • Page 51: Removing Crankshaft And Oil Sensor

    WM 130/170/270 Repair Disassembly Procedures 8.14 Removing Crankshaft and Oil Sensor See Graphic: wc_gr001771 8.14.1 Remove Woodruff key (a). 8.14.2 Taking care not to damage the oil seal, remove the crankshaft (b) from the crankcase (c) by tapping its magneto-side end with a rubber mallet.

  • Page 52: Reassembly Procedures

    Reassembly Procedures WM 130/170/270 Repair Reassembly Procedures Notes on Reassembly Observe the following prior to/during reassembly of the engine: • Clean each part carefully, taking special care with the piston, cylinder, crankshaft, connecting rod, and bearings. • Scrape off any carbon deposits on the cylinder head and the piston head.

  • Page 53: Crankshaft

    WM 130/170/270 Repair Reassembly Procedures Crankshaft See Graphic: wc_001791 9.3.1 Wrap the keyway portion of the crankshaft (a) with polyvinyl tape (b) and insert the crankshaft into the crankcase, taking care not to damage the oil seal lip. 9.3.2 Remove the polyvinyl tape and insert the Woodruff key, for the flywheel magneto, into the crankcase.

  • Page 54: Piston And Piston Rings

    Reassembly Procedures WM 130/170/270 Repair Piston and Piston Rings See Graphic: wc_gr001749, wc_gr001792, and wc_gr001793 Note: When installing the piston rings, make sure not to twist the rings too much as they may be damaged. 9.4.1 Install each piston ring in the correct groove of the piston by widening it enough to slide it over the piston.

  • Page 55: Piston And Connecting Rod

    WM 130/170/270 Repair Reassembly Procedures Piston and Connecting Rod See Graphic: wc_gr001794 and wc_gr001795 9.5.1 Apply a coat of oil to the inside of the connecting rod’s small end (a). 9.5.2 Align the mark on the piston head (b) with the “MAG” mark on the connecting rod.

  • Page 56: Connecting Rod

    To mount the connecting rod, line up the matching marks (g) and fit the clinch portions firmly together. Using two M8 bolts, secure the two halves together. Torque bolts to: WM 130/170 13–15 Nm (9.4–10.8 ft.lbs); WM 270 17–20 Nm (12.3–14.5 ft.lbs).

  • Page 57: Intake And Exhaust Valves

    WM 130/170/270 Repair Reassembly Procedures Intake and Exhaust Valves See Graphic: wc_gr001798 Note: Replace the valves if they show signs of wear. See Clearance Data and Limits Table. 9.7.1 Carefully scrape off any carbon deposits on the combustion chamber. 9.7.2 Before installing, apply oil to the intake valve (e) and the exhaust valve (f).

  • Page 58: Chain Guide

    Reassembly Procedures WM 130/170/270 Repair Chain Guide See Graphic: wc_gr001801 9.8.1 Mount the chain guide (a) to the crankcase. Note: Use mounting position (b). wc_tx000379gb.fm...

  • Page 59: Cylinder Head

    WM 130/170/270 Repair Reassembly Procedures Cylinder Head See Graphic: wc_gr001802 and wc_gr001803 Note: Replace the head gasket (b) whenever the cylinder head is removed. 9.9.1 Inspect for and repair any scratches on the cylinder head (a) mounting surface. 9.9.2 Using four M8 x 68 bolts (c) and one M8 x 35 bolt (d), secure the cylinder head to the cylinder.

  • Page 60: Setting The Timing Chain

    Reassembly Procedures WM 130/170/270 Repair 9.10 Setting the Timing Chain See Graphic: wc_gr001804 9.10.1 Align the timing mark (a) on the crankshaft (b) with the mark plate (c) of the timing chain. 9.10.2 Align the timing mark (a) on the crankshaft (b) with the mark plate (c) on the opposite end of the timing chain.

  • Page 61: Mounting The Camshaft On The Cylinder Head

    WM 130/170/270 Repair Reassembly Procedures 9.11 Mounting the Camshaft on the Cylinder Head See Graphic: wc_gr001805 9.11.1 Mount the camshaft (a) on the cylinder head by inserting the camshaft pin (b) through the head. Secure the pin with the M6 x 12 bolt (c).

  • Page 62: Balancer Shaft Option (Wm 270 Only)

    Reassembly Procedures WM 130/170/270 Repair 9.12 Balancer Shaft Option (WM 270 only) See Graphic: wc_gr001806 9.12.1 Mount the balancer shaft on the crankcase, align the timing marks (a) on the balancer gear (b) and the crankshaft gear (c). Note: Incorrect alignment of the timing marks can result in malfunction of the engine, leading to damage due to interference of the parts.

  • Page 63: Mounting Rocker Arms

    WM 130/170/270 Repair Reassembly Procedures 9.14 Mounting Rocker Arms See Graphic: wc_gr001808, wc_gr010382 Note: Complete this procedure when the piston is at the top dead center position (a). (Timing mark is 90° to the cylinder head surface.) 9.14.1 Insert the rocker arm pin (b) through the intake valve rocker arm (c), through the exhaust rocker arm (d), and mount them to the cylinder head.

  • Page 64: Valve Clearance Adjustment

    Reassembly Procedures WM 130/170/270 Repair 9.15 Valve Clearance Adjustment See Graphic: wc_gr001809 9.15.1 Temporarily fit the flywheel (a). 9.15.2 Rotate the crankshaft up to the top dead center position. Measure the clearance by inserting the thickness gauge (b) between the valve and the adjusting screw (c).

  • Page 65: Rocker Cover And Spark Plug

    WM 130/170/270 Repair Reassembly Procedures 9.16 Rocker Cover and Spark Plug See Graphic: wc_gr001810 Note: Replace the gasket with a new one each time the rocker cover is removed. 9.16.1 Using four M6 x 12 bolts (a), secure the rocker cover (b) and gasket (c) to the cylinder head.

  • Page 66: Case Baffle

    9.17 Case Baffle See Graphic: wc_gr001811 9.17.1 Align the top (a) and bottom (b) of the baffle (c) with the crankcase and using the M6 (WM 130/170) or the M8 (WM 270) bolt (d) secure the case baffle to the crankcase. wc_tx000379gb.fm...

  • Page 67: Flywheel And Starter Pulley

    WM 130/170/270 Repair Reassembly Procedures 9.18 Flywheel and Starter Pulley See Graphic: wc_gr001812 Note: When mounting the flywheel, be sure to wipe off any oil on the tapered portion of the crankshaft and flywheel. 9.18.1 Place the flywheel on the crankshaft. Align the two bosses of the starter pulley (a) with the two depressions on the flywheel (b).

  • Page 68: Speed Control Assembly And Carburetor

    Reassembly Procedures WM 130/170/270 Repair 9.20 Speed Control Assembly and Carburetor See Graphic: wc_gr001814 9.20.1 Using two M6 x 12 bolts (a), secure the speed control assembly (b) to the engine. 9.20.2 Using one M6 x 12 bolt (g), secure the head baffle (c) to the engine.

  • Page 69: Governor Lever

    WM 130/170/270 Repair Reassembly Procedures 9.21 Governor Lever See Graphic: wc_gr001815 9.21.1 Slide the governor rod through the rod spring (a). Connect the governor rod/spring assembly (b) to the throttle lever of the carburetor. 9.21.2 Attach the governor rod/spring assembly to the governor lever (c), then mount the governor lever to the governor shaft.

  • Page 70: Air Cleaner Base

    Reassembly Procedures WM 130/170/270 Repair 9.22 Air Cleaner Base See Graphic: wc_gr001816 9.22.1 Insert the breather pipe (a) into the rocker cover, then using one M6 x 20 flange bolt (b) and two M6 flange nuts (c), mount the air cleaner base (d) to the engine.

  • Page 71: Muffler

    WM 130/170/270 Repair Reassembly Procedures 9.24 Muffler See Graphic: wc_gr001818 Note: Remove any tape or cloth used to cover the exhaust port when the engine was disassembled. 9.24.1 Place the gasket, muffler side up (a), on the engine. 9.24.2 Using one M8 x 12 bolt (b) and two M8 nuts (c), attach the muffler (d) to the engine.

  • Page 72: Fuel Tank

    9.25.1 Connect the fuel line (a) with clamp. 9.25.2 Using two M6 nuts (b) and one M6 x 25 bolt (WM 130/WM 170) or one M8 x 25 bolt (WM 270) (c), secure the fuel tank (d) to the crankcase.

  • Page 73: Blower Housing And Recoil Starter

    WM 130/170/270 Repair Reassembly Procedures 9.26 Blower Housing and Recoil Starter See Graphic: wc_gr001820 9.26.1 Mount the ignition coil cord on the crankcase by aligning it with the case baffle. 9.26.2 Using four M6 x 12 bolts (a), mount the blower housing (b) to the engine.

  • Page 74: Stop Switch

    Reassembly Procedures WM 130/170/270 Repair 9.27 Stop Switch See Graphic: wc_gr001821 9.27.1 Using two M4 screws, mount the stop switch (a) to the blower housing. 9.27.2 Refer to the wiring schematic for wiring details. wc_tx000379gb.fm...

  • Page 75: Air Cleaner

    WM 130/170/270 Repair Reassembly Procedures 9.28 Air Cleaner See Graphic: wc_gr001751 9.28.1 Insert the breather tube (c) into the rocker cover while installing the air cleaner assembly onto the engine. 9.28.2 Using one M6 flange bolt (a) and two M6 flange nuts (b), secure the air cleaner assembly to the engine.

  • Page 76: External Inspection

    Reassembly Procedures WM 130/170/270 Repair 9.29 External Inspection 9.29.1 After reassembly is complete, check that the wiring is correct and that there are no loose nuts and bolts or any other faults on the outside of the engine. 9.30 Engine Oil...

  • Page 77: Filling Engine With Oil

    9.31.2 Remove oil gauge (c) and fill engine with automotive-type engine oil, API service class SE or higher. Quantity: WM 130/WM 170: 0.6 liter (20 oz.) WM 270: 1.1 liter (37 oz.) 9.31.3 Reinstall gasket (d) and oil gauge. wc_tx000379gb.fm...

  • Page 78: Break-In Operation

    Reassembly Procedures WM 130/170/270 Repair 9.32 Break-in Operation A new engine or one that has been completely overhauled by being fitted with a new piston, rings, valves, and connecting rod should be thoroughly run-in before being put into service. Good bearing surfaces and running clearances between the various parts can only be established by operating the engine under reduced speed and loads for a short period of time.

  • Page 79: Sub Systems

    WM 130/170/270 Repair Sub Systems 10 Sub Systems 10.1 Automatic Decompression System See Graphic: wc_gr001827 WM-series engines employ an automatic decompression system as a standard feature. This feature enables easy starting of the engine with lighter recoil pull. The automatic decompression system releases the compression of the engine by lifting up the exhaust valve at cranking speed.

  • Page 80: Fuel System Diagram

    Sub Systems WM 130/170/270 Repair 10.2 Fuel System Diagram Description Description Description Fuel flow Float Pilot air jet Needle valve Main jet Bypass Float Main nozzle Pilot outlet Float chamber Choke valve Pilot jet Main air jet wc_tx000382gb.fm...

  • Page 81: Carburetor

    WM 130/170/270 Repair Sub Systems 10.3 Carburetor Specifications WM 130 WM 170 WM 270 A/C Type Standard Dual Standard Dual Standard Dual 68.8 Main Jet 70.0 81.3 80.3 98.0 96.0 40.0 40.0 Pilot Jet 40.0 40.0 40.0 Pilot screw turning...

  • Page 82: Carburetor Overhaul

    Sub Systems WM 130/170/270 Repair 10.4 Carburetor Overhaul See Graphic: wc_gr001829 Throttle System • When the throttle stop screw (26) is removed, the spring (25) can be removed. • Remove the screw (22) and the throttle valve (23), then take out the throttle shaft (24).

  • Page 83: Carburetor Exploded View

    WM 130/170/270 Repair Sub Systems 10.5 Carburetor Exploded View wc_tx000382gb.fm...

  • Page 84: Recoil Starter

    Sub Systems WM 130/170/270 Repair 10.6 Recoil Starter Disassembly See Graphic: wc_gr001830 Wear eye protection when working on the recoil starter. CAUTION To release the reel spring power: 10.6.1 Hold the starter knob and pull out the starter rope. 10.6.2 Pull out the rope fully and align the rope knot in the reel with the rope guide.
  • Page 85 WM 130/170/270 Repair Sub Systems See Graphic: wc_gr001831 To remove the components: 10.6.6 Grip the case (a) and loosen the set screw (b). 10.6.7 Remove, in this order: the set screw, the ratchet guide (c), the friction spring (d), and the ratchet (e).
  • Page 86 Sub Systems WM 130/170/270 Repair Reassembly See Graphic: wc_gr001832 Re-installing the reel: 10.6.11 Apply grease (Exxon Unirex or equivalent) (a) to the surface of the case. 10.6.12 Adjust the position of the inner end of the spring reel. Reference (b): position where the inner end of the spring touches the rib of the bearing.
  • Page 87 WM 130/170/270 Repair Sub Systems See Graphic: wc_gr001835 Tensioning the reel spring: 10.6.17 Grip the case and turn the reel 6 times counterclockwise. 10.6.18 Rotate the reel so that the rope hole (a) is aligned with the rope guide (b).

  • Page 88: Checking The Recoil Starter After Reassembly

    Sub Systems WM 130/170/270 Repair 10.7 Checking the Recoil Starter After Reassembly Note: Carry out the following procedures to ensure proper operation of the starter assembly. 10.7.1 Pull the starter rope 2–3 times. • If the starter knob is too heavy to pull, check that each part has been assembled as specified.

  • Page 89: Other Starter Checks

    WM 130/170/270 Repair Sub Systems 10.8 Other Starter Checks See Graphic: wc_gr001838 and wc_gr001839 10.8.1 If the spring escapes from the reel (a) during assembly: • Hook the outer end of the spring (b) onto the gap in the reel and rewind the spring, holding the spring (c) with your fingers to prevent it from spinning out of the housing unit.

  • Page 90: Electrical

    Electrical WM 130/170/270 Repair 11 Electrical 11.1 Magneto Wacker engines use a TRANSISTOR IGNITER CIRCUIT (TIC) type, breakerless magneto ignition system. The TIC has the ignition coil outside the flywheel and a lighting coil inside. The flywheel is a specialized piece of equipment.

  • Page 91: Wm 130/Wm170 Ignition Coil Internal Circuit

    WM 130/170/270 Repair Electrical 11.3 WM 130/WM170 Ignition Coil Internal Circuit Ref. Description Ref. Description Ignition timing detective circuit Primary coil Resistor Secondary coil Signal transistor Spark plug Power transistor 11.4 Basic Theory See Graphic: wc_gr001823 11.4.1 Revolution of the flywheel generates electricity on the primary side of...

  • Page 92: Wm 270 Ignition Coil Internal Circuit

    Electrical WM 130/170/270 Repair 11.5 WM 270 Ignition Coil Internal Circuit Ref. Description Ref. Description Primary coil Revolution sensing resistor Power transistor Secondary coil Low speed ignition timing control Spark plug circuit Advancing control circuit Base resistor Control thyristor 11.6 Ignition Timing Characteristics Linear Advancing wc_tx000381gb.fm...

  • Page 93: Wm 270 Basic Theory

    WM 130/170/270 Repair Electrical 11.7 WM 270 Basic Theory See Graphic: wc_gr001824 and wc_gr001825 Revolution of the flywheel generates electricity on the primary side of the ignition coil (1), and the base current I flows to the power transistor (2). Current I turns the power transistor “ON”...

  • Page 94: Wiring Diagram

    Electrical WM 130/170/270 Repair 11.8 Wiring Diagram Description Description Spark plug Oil sensor control unit Stop switch Oil sensor Ignition coil (with built-in transistor) To LED if equipped Flywheel Wire Colors Black Yellow Orange Green Brown Purple Blue Violet Clear...

  • Page 95: Clearance Data And Limits Table

    WM 130/170/270 Repair Clearance Data and Limits Table 12 Clearance Data and Limits Table 12.1 Term Descriptions The following table lists critical dimensions of specific parts. The “Standard” column lists the dimension of the part as new from the factory. The “Limit” column lists the maximum allowance. If the measurement exceeds the “Limit”...
  • Page 96 Clearance Data and Limits Table WM 130/170/270 Repair Item Model Standard Limit mm (in.) mm (in.) Cylinder head WM 130 0.05 or less WM 170 (0.002) (0.004) WM 270 Intake/ WM 130 0.7–1.0 exhaust valve WM 170 (0.0276– contact width WM 270 0.0394)
  • Page 97 WM 130/170/270 Repair Clearance Data and Limits Table Item Model Standard Limit mm (in.) mm (in.) Cylinder 58.000–58.019 To be rebored WM 130 when the dif- (2.2835–2.2842) ference 67.000–67.019 WM 170 Inner diame- between max. (2.6378–2.6385) ter Standard and min.
  • Page 98 Clearance Data and Limits Table WM 130/170/270 Repair Item Model Standard Limit mm (in.) mm (in.) Piston 57.89 57.980–58.000 WM 130 Outer diameter at skirt in (2.2791) (2.2827–2.2835) thrust direction 66.88 66.960–67.000 Standard WM 170 (2.6331) (2.6362–2.6378) 74.980–75.000 74.89 WM 270 (2.9520–2.9527)
  • Page 99 WM 130/170/270 Repair Clearance Data and Limits Table Item Model Standard Limit mm (in.) mm (in.) 13.035 Piston pin hole 12.991–13.009 WM 130 (0.5132) (0.5115 - 0.5122) 16.035 15.991–16.009 WM 170 (0.6313) (0.6296 - 0.6303) 18.035 17.991–18.009 WM 270 (0.7224) (0.7083–0.7090)
  • Page 100 Clearance Data and Limits Table WM 130/170/270 Repair Item Model Standard Limit mm (in.) mm (in.) Connecting rod WM 130 30.1 30.000–30.016 WM 170 (1.1850) Large-end inner diameter (1.1811–1.1817) 34.1 34.500–34.516 WM 270 (1.3425) (1.3386–1.3392) Clearance between large end and crank pin WM 130 0.020–0.049...
  • Page 101 WM 130/170/270 Repair Clearance Data and Limits Table Item Model Standard Limit mm (in.) mm (in.) Large end side clearance WM 130 0.100–0.780 WM 170 (0.0394) (0.040–0.307) WM 270 Crankshaft WM 130 29.85 29.967–29.980 WM 170 (1.1752) Crank pin outer diameter (1.1798–1.1803)
  • Page 102 Clearance Data and Limits Table WM 130/170/270 Repair Item Model Standard Limit mm (in.) mm (in.) Cam inner Cam sprocket inner diame- WM 130 9.05 9.0–9.036 diameter WM 170 (0.3563) (0.3543–0.3557) Cam sprocket pin outer WM 270 diameter Pin outer WM 130 8.95...
  • Page 103 WM 130/170/270 Repair Clearance Data and Limits Table Item Model Standard Limit mm (in.) mm (in.) Valve spring free lengt WM 130 27.4 WM 170 (1.0787) WM 270 Valve seat angle (intake and exhaust) Valve cutter angle (a) Valve contact width (b) WM 130 a: 90°...

  • Page 104: Troubleshooting Table

    Troubleshooting WM 130/170/270 Repair 13 Troubleshooting If the engine shows any sign of malfunction, the cause should be determined immediately and the appropriate countermeasures should be taken to prevent the problem from worsening. This troubleshooting section describes certain known problems, their possible causes, and appropriate action to take.

  • Page 105: Troubleshooting

    WM 130/170/270 Repair Troubleshooting Problem and possible cause Remedy 2. Fuel system problems 1) No fuel in tank Fill tank 2) Fuel hose clogged or pinched Clean or replace 3) Air in fuel lines Check and retighten joints 4) Poor quality gasoline, or water...
  • Page 106 Troubleshooting WM 130/170/270 Repair Problem and possible cause Remedy 1. Insufficient compres- 1) Loose spark plug Retighten, replace sion gasket 2) Leakage from cylinder head Retighten; replace gasket gasket 3) Piston ring seizure or wear Replace 4) Piston or cylinder wear...
  • Page 107 WM 130/170/270 Repair Troubleshooting Problem and possible cause Remedy 1. Carburetor system 1) Low idling speed Adjust 2) Slow system passage clogged Check and clean 2. Intake system 1) Air mixing from air intake sys- Check and tighten; tem joints replace gasket 3.
  • Page 108 Troubleshooting WM 130/170/270 Repair Problem and possible cause Remedy 1. Fuel system 1) Clogged air cleaner Clean or replace 2) Faulty needle valve and/or Clean or replace high fuel level in float chamber 3) Choke does not open fully Repair or replace 2.
  • Page 109 175°C (350°F). If a screw or bolt is hard to remove, heat it using a small propane torch to break down the sealant. When applying sealants, follow instructions on container. The sealants listed are recommended for use on Wacker Neuson equipment. TYPE PART NO. –...
  • Page 110 175°C (350°F). If a screw or bolt is hard to remove, heat it using a small propane torch to break down the sealant. When applying sealants, follow instructions on container. The sealants listed are recommended for use on Wacker Neuson equipment. TYPE PART NO. –...
  • Page 111 Torque Values Torque Values Metric Fasteners (DIN) TORQUE VALUES (Based on Bolt Size and Hardness) WRENCH SIZE 10.9 12.9 Size ft.lb. ft.lb. ft.lb. Metric Inch Metric Inch 7/32 – 9/32 – 5/16 – – – – 11/16 – – – 15/16 –...
  • Page 112 Torque Values Torque Values (continued) Inch Fasteners (SAE) Size ft.lb. ft.lb. ft.lb. Metric Inch Metric Inch No.4 – 3/32 No.6 5/16 – 7/64 No.8 11/32 – 9/64 No.10 – – 5/32 – 7/16 – 3/32 5/16 – – 9/16 – 5/16 7/16 –...
  • Page 114 Tel. : (262) 255-0500 Fax: (262) 255-0550 Tel.: (800) 770-0957 Wacker Neuson Limited - Room 1701–03 & 1717–20, 17/F. Tower 1, Grand Century Place, 193 Prince Edward Road West, Mongkok, Kowloon, Hongkong. Tel: (852) 3605 5360, Fax: (852) 2758 0032...

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