Stiga WBE170 Workshop Manual
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Stiga WBE170 Workshop Manual

Stiga WBE170 Workshop Manual

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WBE 170
WBE 170
WORKSHOP MANUAL
WORKSHOP MANUAL
Rel. 0.
2019 - 2021
PRODUCTION YEAR
The manufacturer reserves the right to make all the necessary technical or commercial improvements to
its products, so there may be some differences between the series of engines and the contents of this
manual. However the basic specifications and different operating procedures will remain the same.
by STIGA - No use of the illustrations or duplication, reproduction or translation, even partial, of the texts
in this document may be made without explicit authorization.
IMPORTANT NOTICE : The information contained herein is intended for Service Operations and professionals
only, able to competently perform the operations described herein, using the appropriate equipment in
order to safeguard se-curity and performance of the machine. The manufacturer is not liable for damages
or injuries arising from operations performed by individuals or inadequate facilities.

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Summary of Contents for Stiga WBE170

  • Page 1 However the basic specifications and different operating procedures will remain the same. by STIGA - No use of the illustrations or duplication, reproduction or translation, even partial, of the texts in this document may be made without explicit authorization.

  • Page 3: Table Of Contents

    << BACK >> Engine WBE 170 CONTENTS INTRODUCTION ..................... 5 1. RULES AND PROCEDURES FOR SERVICE CENTRES .......... 6 1.1. Guarantee validity ..........................6 1.2. Service repairs after guarantee period .....................6 1.3. Fault notification...........................6 1.4. Spare parts request ..........................6 2. GENERAL AND SAFETY REGULATIONS ............. 7 2.1.
  • Page 4 << BACK >> Engine WBE 170 CONTENTS 9. CARBURATION ....................24 9.1. Removing and cleaning the carburettor ..................24 9.2. Replacing the carburettor ........................27 9.3. Adjusting speed ..........................27 9.4. Adjusting the carburation .........................27 10. GOVERNOR SYSTEM OF THE CARBURETTOR ..........28 10.1.

  • Page 5: Introduction

    (7). gine version. reverse 484479-30/ME110003424/120 NOTE: During the description of procedures, WBE170 18162014 EURO(V) WARNING: Before the tank with new fuel, check that the petrol pipe is intact. the indications “right”, “left”, “front”, “rear”, 484479-30/ME110003424/120 “upper”...

  • Page 6: Rules And Procedures For Service Centres

    << BACK >> Engine WBE 170 INDEX 1. RULES AND PROCEDURES FOR SERVICE CENTRES 1.1. Guarantee validity The warranty is supplied under the terms, procedu- res and limits stated in the contract. 1.2. Service repairs after guarantee period The Service Centre must write a report for each intervention containing the serial number of the 3.1], and summary information about engine...

  • Page 7: General And Safety Regulations

    << BACK >> Engine WBE 170 INDEX 2. GENERAL AND SAFETY REGULATIONS 2.3. Precautions during servicing IMPORTANT: Before commencing with any As well as following the usual accident prevention intervention, carefully read the information regulations that apply to most repair shops, we provided in the present manual, in particular recommend you: the following safety regulations.

  • Page 8: Warning Labels

    , symbol used for certain interventions indicates that special tools or equipment are re- commended. •• ••• •••• WBE170 2.6. Symbols and terms used for safety purposes Some paragraphs in this manual are preceded by symbols which indicate the following:...

  • Page 9: Technical Data And Specifications

    3. TECHNICAL DATA AND SPECIFICATIONS 3.4. Expendable materials WBE 170 Unleaded (green) Petrol 484479-30/ME110003424/120 minimum 90N.O. WBE170 18162014 EURO(V) - from 5 to 35 °C SAE 30 Engine oil - from -15 to + 10W30 35°C Spark plug RC12 YC Starter rope ø...

  • Page 10: Tightening Torques

    << BACK >> Engine WBE 170 INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.6. Tightening torques 55-65 Nm 8-12 Nm 6-10 Nm 8-12 Nm 8-12 Nm 5-7 Nm 8-12 Nm 5-7 Nm 25-32 Nm 8-12 Nm 5-7 Nm 6-10 Nm 8-12 Nm 11-13 Nm 5-7 Nm 8-12 Nm...

  • Page 11: Table Of Tightening Torques

    << BACK >> Engine WBE 170 INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.7. Table of Tightening torques Chapter Ref. Description of screw Tightening torques Tank fixing screw 8 - 12 Nm 5 - 6 Fixing nuts, starter assembly 6 - 10 Nm Starter screw 8 - 12 Nm Starter motor mounting screws...

  • Page 12: Identification Of Engine Units

    << BACK >> Engine WBE 170 INDEX 3. TECHNICAL DATA AND SPECIFICATIONS 3.8. Identification of engine units For ease of reference, this manual has subdivided maintenance operations into different sections, each of which refers to an engine component unit as indicated in the diagrams below. Starting system Ignition Turning off and Stopping...

  • Page 13: Engine Tuning And Testing

    << BACK >> Engine WBE 170 INDEX 4. ENGINE TUNING AND TESTING 4.1. Operating guidelines The engine requires a series of interventions (shown in the table below) in order to ensure minimum basic maintenance. Every 25 Every 50 Every 5 hours Every 100 Operation First 5 hours...

  • Page 14: Functional Test

    << BACK >> Engine WBE 170 INDEX 4. ENGINE TUNING AND TESTING 4.3. Functional test A functional test needs to be carried out at the end of each servicing operation, to check that the operations made are effective. The test must be performed in compliance with the safety regula- tions regarding the use of the lawnmower on which the engine is installed.

  • Page 15: Tank And Supply

    << BACK >> Engine WBE 170 INDEX 5. TANK AND SUPPLY IMPORTANT: Carefully read the information below before commencing any intervention. General Information The fuel supply system comprises the petrol tank connected to the carburettor by a pipe; a mesh filter at the bottom of the tank prevents deposits and impurities from reaching the carburettor.

  • Page 16: Emptying And Removing The Tank

    4 - Loosen the two rear screws (6) and remove the tank (7). 5 - When fitting, perform the above operations in reverse 484479-30/ME110003424/120 WBE170 18162014 EURO(V) WARNING: Before refilling the tank with new fuel, check that the petrol pipe is intact. 484479-30/ME110003424/120 page 16 Workshop Manual...

  • Page 17: Cleaning The Tank

    << BACK >> Engine WBE 170 INDEX 5. TANK AND SUPPLY 5.2. Cleaning the tank 5.1]. 1 - Remove the tank 2 - Slide out the filter tube (8) and blow compressed air through it so as to remove any deposits inside. 3 - Keeping the hole (9) in the spigot closed, pour about 100 cc of clean petrol into the tank and shake it vigorously to clean the inside.

  • Page 18: Starting System ( Manual Starter)

    << BACK >> Engine WBE 170 INDEX 6. STARTING SYSTEM manual starter) General information The starter assembly inside the cover consists of a rope wound around a pulley. The movement from the pulley to the flywheel (and therefore to the engine shaft) is transmitted through a pair of couplings. The return of the pulley and the rewinding of the rope are obtained from a spiral spring.

  • Page 19: Replacing The Hooks

    << BACK >> Engine WBE 170 INDEX 6. STARTING SYSTEM manual starter) 4 - Rotate the pulley (4) through about 7 complete turns anticlockwise in order to load the spring and hold it still. 5 - Insert one end of the rope (5) (ø 3,2mm - length 2200mm) through the guide in the ventilation grille, into the hole in the pulley (4), and fasten it by tying a knot.

  • Page 20: Starting System ( Electric Starter)

    << BACK >> Engine WBE 170 INDEX 7. STARTING SYSTEM electric starter) General information The electric starter unit consists of a motor powered by a 12 Volt battery (mounted on the engine). See the relevant section for advice on resolving problems due to the malfunctioning of the star- ting system.

  • Page 21: Disassembly And Cleaning The Starter Motor Pinion

    << BACK >> Engine WBE 170 INDEX 7. STARTING SYSTEM electric starter) 7.2. Disassembly and cleaning the starter motor pinion 7.1]. 1 - Remove the starter motor 2 - Use a screwdriver to rotate the pinion (1) to check that it spins and moves co-axially and can compress the spring (2).

  • Page 22: Intake System

    << BACK >> Engine WBE 170 INDEX 8. INTAKE SYSTEM General information The intake system uses an air filter directly connected to the carburettor by means of a manifold which conveys the air/petrol mixture to the inlet valve. See the relevant section for advice on resolving problems due to the malfunctioning of the air intake system.
  • Page 23 << BACK >> Engine WBE 170 INDEX 8. INTAKE SYSTEM 4 - Bang the air filter element on a hard surface so as to remove excess dirt, and blow it through with compressed air, outwards from the inside. Replace the element if it is too dirty. 5 - Refit the element(3) and the cover into their housings, into its housing, paying attention to hook up the clips correctly (2).

  • Page 24: Carburation

    << BACK >> Engine WBE 170 INDEX 9. CARBURATION General information The carburettor has a float with a fixed jet and a “AUTO-CHOKE” control. See the relevant section for advice on resolving problems due to carburation. The carburettor is located on the left hand side of the engine. For maintenance operations, it is necessary to remove the air intake filter in the sequence shown below.
  • Page 25 << BACK >> Engine WBE 170 INDEX 9. CARBURATION 6 - Remove the tie rod (6) of the AUTO-CHOKE lever by releasing the locking clip (7). Slightly pull out the carburettor to facilitate the release of the intake butterfly shaft. 7 - Rotate the butterfly valve clockwise 90°...
  • Page 26 << BACK >> Engine WBE 170 INDEX 9. CARBURATION 9 - Unscrew the central screw (14) securing the tank (15) and remove the corresponding OR (16). 10 - Pull out the pin (17), dismount the float (18) and remove the gasket (19). 11 - Undo the main jet (20) and pull out the pilot jet (21).

  • Page 27: Replacing The Carburettor

    << BACK >> Engine WBE 170 INDEX 9. CARBURATION It is always advisable to replace the washer (19) and the O-Ring (16) of the float chamber; - the float (18) must oscillate freely on the pin (17); - the jet (20) should never be modified or replaced with others even if they seem to have the same specifications;...

  • Page 28: Governor System Of The Carburettor

    << BACK >> Engine WBE 170 INDEX 10. GOVERNOR SYSTEM OF THE CARBURETTOR General information The carburettor governor system uses a engine shaft linkage fitted on a support fixed to the left-hand side of the engine, completed by a counterweight device, driven by the camshaft, and thus sensitive to changes in the engine’s revolution pattern depending on load.
  • Page 29 << BACK >> Engine WBE 170 INDEX 10. GOVERNOR SYSTEM OF THE CARBURETTOR 4 - If the above checks do not show any faults, the phasing of the governor’s control lever (5) with respect to the counterweight device must be checked: - stop the engine and make sure that the lever (5) is in the end run position;...

  • Page 30: Auto-Choke System

    << BACK >> Engine WBE 170 INDEX 11. AUTO-CHOKE SYSTEM General information The smart starter system (AUTO-CHOKE System) is a mechanism sensitive to temperature variation that adjusts the starter’s throttle valve, ensuring immediate and proper starting and operating of the engine automatically. The AUTO-CHOKE system assembled on the exhaust unit employs a lever connected to the adjusting pin of the second throttle valve.

  • Page 31: Ignition

    << BACK >> Engine WBE 170 INDEX 12. IGNITION General information The ignition system has a flywheel with an electronic coil which supplies high voltage to the spark plug. See the relevant section for advice on resolving problems related to the ignition. The coil and flywheel can be accessed by removing the cover.

  • Page 32: Checking The Starter Micro Switch ( Version With Electric Starter)

    << BACK >> Engine WBE 170 INDEX 12. IGNITION 12.2. Checking the starter micro switch ( version with electric starter) 1 - Disconnect the two connectors (6). 2 - Using an Ohmmeter tester, (7) make contact with the prods on terminals of the microswitch (8). the instrument should read: - 0 = microswitch pressed (lever pulled);...

  • Page 33: Adjusting The Air Gap And Checking The Coil

    << BACK >> Engine WBE 170 INDEX 12. IGNITION 12.3. Adjusting the air gap and checking the coil 1 - Remove the cover and uncouple the conveyor. 2 - Make sure that the earth cable faston (10) of the coil (11) is not oxidized; if it is, disconnect, clean and remount it, spraying it with a special antioxidant.

  • Page 34: Replacing The Coil

    << BACK >> Engine WBE 170 INDEX 12. IGNITION 12.1]. 7 - Perform a spark test as indicated in - If the spark jumps: the coil functions properly and in the event of malfunction, verify that the cut-off cable (17) is not earthed. - if the spark does not jump: the coil is faulty and 12.4].

  • Page 35: Turning Off And Stopping The Engine

    << BACK >> Engine WBE 170 INDEX 13. TURNING OFF AND STOPPING THE ENGINE General information The engine is turned off and stopped by releasing a lever on the lawnmower. The cable acts on a lever which simultaneously activates a microswitch that sends the coil to earth as well as a brake which acts on the flywheel.

  • Page 36: Checking The Brake

    << BACK >> Engine WBE 170 INDEX 13. TURNING OFF AND STOPPING THE ENGINE 13.3. Checking the brake 1 - Remove the cover and uncouple the conveyor. 2 - Check that the thickness of the friction pad (8) is not less than 2 mm at its thinnest point. 3 - Make sure that the control lever (3) moves freely and remove any remains of grass and mud.

  • Page 37: Replacing The System For Turning Off And Stopping The Engine

    << BACK >> Engine WBE 170 INDEX 13. TURNING OFF AND STOPPING THE ENGINE 13.4. Replacing the system for turning off and stop- ping the engine 1 - Remove the cover and uncouple the conveyor. 2 - Disconnect the brake wire (2) from the lever (3). 3 - Disconnect the earth cable Faston connector (6).

  • Page 38: Exhaust System

    << BACK >> Engine WBE 170 INDEX 14. EXHAUST SYSTEM General information The exhaust system consists of a muffler installed on the cylinder with a guard and an inserted gasket. 17]. To solve problems in the exhaust system, see the relevant chapte 14.1. Removing and replacing the muffler 1 - Remove the two screws (1) securing the muffler guard (2).

  • Page 39: Engine Block - External Operations

    << BACK >> Engine WBE 170 INDEX 15. ENGINE BLOCK - External operations 15.1. Checking the heating unit seal 1 - Remove the cap (1) and take out the spark plug (2). 2 - Manually set the piston to the TDC (Top Dead Centre) of the compression stroke so that both valves are closed.

  • Page 40: Adjusting The Valve Clearance

    << BACK >> Engine WBE 170 INDEX 15. ENGINE BLOCK - External operations 15.2. Adjusting the valve clearance WARNING: The adjustment must be made with the engine is cold. 1 - Remove the cover and demount the spark plug 15.1]. 2 - Remove the cover (5) which is secured with four screws (6) and remove the gasket (7).

  • Page 41: Dismantling And Replacing The Flywheel

    << BACK >> Engine WBE 170 INDEX 15. ENGINE BLOCK - External operations 15.3. Dismantling and replacing the flywheel 1 - Remove the cover and uncouple the conveyor. 2 - Operate the exhaust brake. 3 - Using an airgun, undo the nut (13). 4 - Undo the screw (14) and the stud (15) and re- move the electronic coil (16).

  • Page 42: Blow-By Check

    << BACK >> Engine WBE 170 INDEX 15. ENGINE BLOCK - External operations 15.4. Blow-by check 15.3]. 1 - Remove the flywheel and the coil 2 - Loosen the screws (19) that secure the closing plate (20). 3 - Remove the cork gasket (21). 4 - Check that the reed (22) is not blocked or de- formed.

  • Page 43: Replacing The Lower Compression Ring Of The Engine Shaft (Sump Side)

    << BACK >> Engine WBE 170 INDEX 15. ENGINE BLOCK - External operations 15.6. Replacing the lower compression ring of the engine shaft (sump side) NOTE - Remove the motor from the lawnmo- wer; - drain all the oil from the sump; - drain the petrol from the tank and carbu- rettor tray;...

  • Page 44: Engine Block - Overhauling Internal Parts

    << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts All the following operations on the grass cutter ne- cessitate the removal of the motor. 16.1. Carter opening 1 - Loosen the lever fixing nut (1), release the spring (2) and remove the control lever (3).

  • Page 45: Dismantling And Checking The Camshaft And Counterweight Governor

    << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 16.2. Dismantling and checking the camshaft and counterweight governor 1 - Bring the piston to the TDC (Top Dead Centre). 16.1]. 2 - Open the crank case 3 - Remove the camshaft (7).
  • Page 46 << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 9- In the case of breakage or irregular operation of the counterweights the whole group, fixed by a plate (13) and a screw (14) must be replaced. 10 - Before fitting the camshaft ensure that the two tappets (15) are correctly housed in their seats.

  • Page 47: Dismantling And Checking The Piston, Piston Rings, Connecting Rod And Engine Shaft

    << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 16.3. Dismantling and checking the piston, piston rings, connecting rod and engine shaft NOTE - These paragraphs describe all the operations for checking and overhauling the thermal components of the engine; it is left to the operator to assess the advisability of performing all the operations described or...
  • Page 48 << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 10 - To check the wear in the compression rings, insert them one at a time into the cylinder (22) by about 10-15 mm and measure the gap between the two ends with a feeler gauge (25);...
  • Page 49 << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 14 - Check the diameter of the gudgeon pin (29) in several places and replace it if it is less than 12.95 mm, even at a single point. 15 - Check the diameters of the gudgeon pin hou- sings (A) on the piston (21) and replace the piston if they are more than 13.05 mm, even at a single...
  • Page 50 << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 17 - On the engine shaft (23), removed beforehand, use a digital gauge to check the diameter of the connecting rod pin. The value must not be less than 25,92 mm or the engine shaft will have to be replaced.
  • Page 51 << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 20 - Fit the connecting rod (19), gudgeon pin (29) and clamping rings (28) to the piston (21). NOTE - The marking on the piston must be directed towards the intake.
  • Page 52 << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 23 - Mount the engine shaft (23) and the connecting rod cap (18) with the relative screws (20), taking care with the position references (35) so as to avoid inverting the mounting direction of the cap.

  • Page 53: Overhauling The Valves

    << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 16.4 Overhauling the valves NOTE - These paragraphs describe all the operations for checking and overhauling the valves; it is left to the operator to assess the advisabi- lity of performing all the operations described or only part of them, depending on the type of engine problems encountered.
  • Page 54 << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 6 - Check the free length of the spring (40) and if it is less than 34.50 mm replace the spring. 7 - When mounting: - carefully clean the valve guides and housings of any foreign body;...
  • Page 55 << BACK >> Engine WBE 170 INDEX 16. ENGINE BLOCK - Overhauling internal parts 9 - Close the carter and fix the screws (4) to the 16.1]. indicated couple 10 - During assembly perform the operations 16.1] indicated in section always remember to replace the silicone gasket (6) between the sump and the casing.

  • Page 56: Troubleshooting

    << BACK >> Engine WBE 170 INDEX 17. TROUBLESHOOTING PROBLEM CAUSE SOLUTION The engine brake cable is faulty or Adjust and/or replace the cable 13.1] unfastened Replace the whole shut-down group The OFF microswitch is faulty 13.2] Check electrical cabling of earth wire Coil earth connection 12.1] Replace the whole shut-down group...
  • Page 57 << BACK >> Engine WBE 170 INDEX 17. TROUBLESHOOTING PROBLEM CAUSE SOLUTION The tank cap has a clogged breather Clean and/or replace the cap pipe 5.3] Check correct valve operation 16.4]. Check that the spark plug is he engine starts but does Insufficient pressure 12.1].
  • Page 58 << BACK >> Engine WBE 170 INDEX 17. TROUBLESHOOTING PROBLEM CAUSE SOLUTION The engine brake cable is bent or Check and/or adjust the cable 13.1] jammed The engine does not turn off The earth cable is disconnected or Check and/or replace oil breather 12.1] broken The engine does not stop...

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Wbe 120Wbe 140

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