Wacker Neuson WM 130 Repair Manual
  1. Manuals
  2. Brands
  3. Wacker Neuson Manuals
  4. Engine
  5. WM 130
  6. Repair manual
Wacker Neuson WM 130 Repair Manual

Wacker Neuson WM 130 Repair Manual

Hide thumbs Also See for WM 130:
Table of Contents

Advertisement

Quick Links

See also: Operator's Manual
www.wackergroup.com
REPAIR MANUAL
0
1
5
9
5
6
3
E
N
0159563en
1006
Engine
WM 130
WM 170
WM 270
002

Advertisement

Table of Contents
loading
Need help?

Need help?

Do you have a question about the WM 130 and is the answer not in the manual?

Questions and answers

Related Manuals for Wacker Neuson WM 130

Summary of Contents for Wacker Neuson WM 130

  • Page 1 0159563en 1006 Engine WM 130 WM 170 WM 270 REPAIR MANUAL...
  • Page 3 WM 130/170/270 Repair Foreword 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.
  • Page 4 Foreword WM 130/170/270 Repair CALIFORNIA Proposition 65 Warning: Engine exhaust, some of its constituents, and certain vehicle components, contain or emit chemicals known to the State of WARNING California to cause cancer and birth defects or other reproductive harm. Laws Pertaining to Spark Arresters...

  • Page 5: Table Of Contents

    WM 130/170/270 Repair Table of Contents Emission Control System Information Safety Information Laws Pertaining to Spark Arresters ............ 16 Operating Safety ................17 Operator Safety while using Internal Combustion Engines ....18 Service Safety ..................19 Safety Labels ..................20...
  • Page 6 Table of Contents WM 130/170/270 Repair Teardown/Rebuild Procedures Tools ....................38 Ordering Parts ..................38 Reference Numbers ( ) ................38 Weight Block ..................38 Disassembly Procedures Draining Oil ..................39 Removing Air Cleaner .................40 Removing Stop Switch, Recoil Starter, and Blower Housing ....41 Removing Fuel Tank, Muffler, and Muffler Cover ........42 Removing Governor, Carburetor, and Speed Control Lever ....43...
  • 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 Repair 12. Clearance Data and Limits Table 12.1 Term Descriptions ................95 13. Troubleshooting 13.1 Troubleshooting Table ...............104 wc_br0159563enTOC.fm...

  • Page 9: Emission Control System Information

    Emission Control System Information 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.
  • Page 10 Emission Control System Information 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.
  • Page 11 Emission Control System Information 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.
  • Page 12 Emission Control System Information 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.
  • Page 13 Emission Control System Information 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).
  • Page 14 Emission Control System Information 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.
  • Page 15 Emission Control System Information 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.
  • Page 16 Emission Control System Information 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.
  • Page 17 Emission Control System Information 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.
  • Page 18 Emission Control System Information Wacker is liable for damages to other engine components proximately caused by a failure under warranty of any warranted part. Throughout the engine warranty period stated above, Wacker will maintain a supply of warranted parts sufficient to meet the expected demand for such parts.
  • Page 19 Emission Control System Information 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.

  • Page 20: Safety Information

    Safety Information WM 130/170/270 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.

  • Page 21: Operating Safety

    WM 130/170/270 Safety Information Operating Safety Familiarity and proper training are required for the safe operation of equipment! Equipment operated improperly or by untrained personnel can be dangerous! Read the operating instructions contained in this WARNING manual and familiarize yourself with the location and proper use of all controls.

  • Page 22: Operator Safety While Using Internal Combustion Engines

    Safety Information WM 130/170/270 Operator Safety while using Internal Combustion Engines Internal combustion engines present special hazards during operation and fueling! Read and follow all warning instructions and safety guidelines in this manual. Failure to follow warnings and safety DANGER guidelines could result in severe injury or death.

  • Page 23: Service Safety

    WM 130/170/270 Safety Information Service Safety Poorly maintained equipment can become a safety hazard! In order for the equipment to operate safely and properly over a long period of time, periodic maintenance and occasional repairs are necessary. WARNING 2.4.1 DO NOT attempt to clean or service the machine while it is running.

  • Page 24: Safety Labels

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

  • Page 25: Technical Data

    WM 130/170/270 Technical Data 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 cm³ (in³) 126 (7.69) 169 (10.31) 265 (16.17) Engine Speed - max.

  • Page 26: Operation

    Operation WM 130/170/270 Operation Recommended Fuel This engine is certified to operate on automotive unleaded gasoline. Use only fresh, clean gasoline. Gasoline containing water or dirt will damage fuel system. Before Starting 4.2.1 Read and understand safety and operating instructions at beginning of this manual.

  • Page 27: To Start

    WM 130/170/270 Operation To Start See Graphic: wc_gr000655 4.3.1 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). 4.3.2 Turn engine switch to “ON”...

  • Page 28: Maintenance

    Maintenance WM 130/170/270 Maintenance Periodic Maintenance Schedule Daily After Every Every Every Every before first 20 2 weeks month year 500 hrs. starting hours 50 hrs. 100 hrs. 300 hrs. Check fuel level. Check engine oil level. Inspect fuel lines.

  • Page 29: 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 30: Engine Oil

    Maintenance WM 130/170/270 Engine Oil See Graphic: wc_gr000087 5.3.1 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. Dispose of this liquid in accordance with environmental protection legislation.

  • Page 31: Air Cleaner

    WM 130/170/270 Maintenance Air Cleaner See Graphic: wc_gr000656 NEVER use gasoline or other types of low flash point solvents for cleaning the air cleaner. A fire or explosion could result. WARNING NOTICE: NEVER run engine without air cleaner. Severe engine damage will occur.

  • Page 32: Storage

    Maintenance WM 130/170/270 Storage If machine is being stored for more than 30 days: 5.6.1 Drain fuel from tank. Start engine and run until remaining fuel is used. 5.6.2 Remove spark plug. Pour approximately 5 cc of clean SAE 10W30 engine oil into cylinder through spark plug opening.

  • Page 33: Theory Of Operation

    WM 130/170/270 Theory of Operation 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 34 Theory of Operation WM 130/170/270 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 35 WM 130/170/270 Theory of Operation 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 36 Theory of Operation WM 130/170/270 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 37 WM 130/170/270 Theory of Operation 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 38: Cross Section Across Shaft

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

  • Page 39: Components-Cross Section Across Shaft

    WM 130/170/270 Theory of Operation 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 40: Cross Section Along Shaft

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

  • Page 41: Components-Cross Section Along Shaft

    WM 130/170/270 Theory of Operation 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 42: Teardown/Rebuild Procedures

    Teardown/Rebuild Procedures WM 130/170/270 Repair Teardown/Rebuild Procedures Tools Because all possible problems encountered while repairing the machine cannot be anticipated, it is up to the mechanic to use common sense and good judgement in tool selection. The use of any special tools is recommended only for those operations where the use of conventional tools proves inadequate.

  • Page 43: Disassembly Procedures

    WM 130/170/270 Repair Disassembly Procedures 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 44: Removing Air Cleaner

    Disassembly Procedures WM 130/170/270 Repair 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 45: Removing Stop Switch, Recoil Starter, And Blower Housing

    WM 130/170/270 Repair Disassembly Procedures 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 46: Removing Fuel Tank, Muffler, And Muffler Cover

    Disassembly Procedures WM 130/170/270 Repair 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 47: Removing Governor, Carburetor, And Speed Control Lever

    WM 130/170/270 Repair Disassembly Procedures 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 48: Removing Ignition Coil, Starter Pulley, And Flywheel

    Disassembly Procedures WM 130/170/270 Repair 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 49: Removing Case Baffle, Charge Coil, And Spark Plug

    WM 130/170/270 Repair Disassembly Procedures 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 50: Removing Rocker Cover And Rocker Arm

    Disassembly Procedures WM 130/170/270 Repair Removing Rocker Cover and Rocker Arm 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 51: Removing Main Bearing Cover

    WM 130/170/270 Repair Disassembly Procedures Removing Main Bearing Cover See Graphic: wc_gr001767 8.9.1 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 52: Removing Tensioner And Camshaft

    Disassembly Procedures WM 130/170/270 Repair 8.10 Removing Tensioner and Camshaft See Graphic: wc_gr001768 8.10.1 Remove the tensioner pin (a), tensioner spring (b), and the tensioner (c). 8.10.2 Remove M6 camshaft pin retaining bolt (d). Remove the camshaft pin (e). Be careful not to damage the pin’s O-ring.

  • Page 53: Removing Cylinder Head And Valves

    WM 130/170/270 Repair Disassembly Procedures 8.11 Removing Cylinder Head and Valves See Graphic: wc_gr001769 8.11.1 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 54: Removing Connecting Rod And Piston

    Disassembly Procedures WM 130/170/270 Repair 8.12 Removing Connecting Rod and Piston See Graphic: wc_gr001770 8.12.1 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 55: Removing Crankshaft And Oil Sensor

    WM 130/170/270 Repair Disassembly Procedures 8.13 Removing Crankshaft and Oil Sensor See Graphic: wc_gr001771 8.13.1 Remove Woodruff key (a). 8.13.2 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 56: 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 57: 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 58: 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 59: 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 60: 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 61: 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 62: 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 63: 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 64: 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 65: 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 66: 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 67: Mounting Rocker Arms

    WM 130/170/270 Repair Reassembly Procedures 9.14 Mounting Rocker Arms See Graphic: wc_gr001808 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 68: 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 69: 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 70: 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 71: 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 72: 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 73: 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 74: 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 75: 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 76: 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 77: 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 78: 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 79: 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 80: 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 81: 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 82: 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 83: 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 84: 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 85: 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 Main Jet 63.8 77.5 76.3 98.0 96.0 Pilot Jet 37.5 40.0 40.0 Pilot screw turning 1-1/8 1-3/4 1-1/2 Float System The float chamber is located below the carburetor body.

  • Page 86: 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 87: Carburetor Exploded View

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

  • Page 88: 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 89 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 90 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 91 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 92: 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 93: 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 94: 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 95: 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 96: 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 97: 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 98: 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 99: 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 100 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 101 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 (2.2835–2.2842) when the dif- ference 67.000–67.019 WM 170 Inner diame- between max. (2.6378–2.6385) ter Standard and min.
  • Page 102 Clearance Data and Limits Table WM 130/170/270 Repair Item Model Standard Limit mm (in.) mm (in.) Piston 57.85 57.940–57.960 WM 130 Outer diameter at skirt in (2.2776) (2.2811–2.2819) thrust direction 66.84 66.930–66.950 Standard WM 170 (2.6315) (2.650–2.6358) 74.930–74.950 74.84 WM 270 (2.9500–2.9508)
  • Page 103 WM 130/170/270 Repair Clearance Data and Limits Table Item Model Standard Limit mm (in.) mm (in.) Piston pin hole 13.035 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 104 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 Large-end inner diameter WM 170 (1.1850) (1.1811–1.1817) 34.1 30.000–30.016 WM 270 (1.3425) (1.1811–1.1817) Clearance between large end and crank pin WM 130 0.020–0.049...
  • Page 105 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 Crank pin outer diameter WM 170 (1.1752)
  • Page 106 Clearance Data and Limits Table WM 130/170/270 Repair Item Model Standard Limit mm (in.) mm (in.) Cam sprocket inner diameter Cam inner WM 130 9.05 9.0–9.036 Cam sprocket pin outer diameter WM 170 (0.3563) (0.3543–0.3557) diameter WM 270 Pin outer WM 130 8.58...
  • Page 107 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 108: Troubleshooting

    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 109 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 110 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 111 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 112 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 113 Threadlockers and Sealants Threadlockers and Sealants Threadlocking adhesives and sealants are specified throughout this manual by a notation of “S” plus a number (S#) and should be used where indicated. Threadlocking compounds normally break down at temperatures above 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.
  • Page 114 Threadlockers and Sealants Threadlockers and Sealants (continued) Threadlocking adhesives and sealants are specified throughout this manual by a notation of “S” plus a number (S#) and should be used where indicated. Threadlocking compounds normally break down at temperatures above 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.

  • Page 115: Torque Values

    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 116 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 118 Wacker Construction Equipment AG · Preußenstraße 41 · D-80809 München · Tel.: +49-(0)89-3 54 02 - 0 · Fax: +49 - (0)89-3 54 02-3 90 Wacker Corporation · P.O. Box 9007 · Menomonee Falls, WI 53052-9007 · Tel. : (262) 255-0500 · Fax: (262) 255-0550 · Tel. : (800) 770-0957 Wacker Asia Pacific Operations ·...

This manual is also suitable for:

Wm 170Wm 270

Table of Contents