Husqvarna HS 139A Workshop Manual
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Husqvarna HS 139A Workshop Manual

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Workshop manual
HS 139A, HS 166A
English
1425 - 001 - 03.06.2020

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Summary of Contents for Husqvarna HS 139A

  • Page 1 Workshop manual HS 139A, HS 166A English 1425 - 001 - 03.06.2020...

  • Page 2: Table Of Contents

    Contents 1 Introduction 1.1 General..............3 1.2 Document description..........3 1.3 Target group............3 1.4 Revisions..............3 1.5 Safety..............3 1.6 Servicing tools............3 2 Safety 2.1 Safety definitions............4 2.2 General safety instructions........4 2.3 Special safety instructions........4 2.4 Symbols on the product......... 4 3 Prepare and do servicing on the product 3.1 Maintenance schedule...........

  • Page 3: Introduction

    The instructions give information on which tools that are necessary for each procedure. HS 139A HS 166A This publication covers Husqvarna engines HS 139A, HS 166A from model year 2020. Workshop manuals are available for models that are no longer sold. 1.2 Document description This manual gives a full description of how to do maintenance and repair on the product.

  • Page 4: Safety

    2 Safety 2.1 Safety definitions • Do not fill fuel in an indoor area. Not sufficient airflow can cause injury or death because of asphyxiation or Warnings, cautions and notes are used to point out carbon monoxide. specially important parts of the manual. •...
  • Page 5 Do not breathe in exhaust fumes. The exhaust fumes from the engine contain carbon monoxide, an odourless, poisonous and very dangerous gas. Do not start the engine indoors or in closed spaces. Hot surface. Fill the engine with oil before you start the product..

  • Page 6: Prepare And Do Servicing On The Product

    3 Prepare and do servicing on the product 3.1 Maintenance schedule Maintenance Before Each 100 Each 50 h operation Clean the external surface. Clean the muffler, the exhaust pipe and the engine from dirt and unwanted lubri- cant. Examine the engine, the fuel tank and the fuel lines for leaks. Tighten nuts and screws.

  • Page 7: To Do A Check Of The Oil Level

    • Do not fully fill the fuel tank. Keep a space of a minimum 2.5 cm. 3.3 To do a check of the oil level CAUTION: A too low oil level can do damage to the engine. Do a check of the oil level before you start the product.

  • Page 8: Servicing Data

    4 Servicing data HS 139A 8~12 Nm M6 x 14 (3) 8~12 Nm M6 x 60 (2) 6~10 Nm 8~12 Nm M6 (2) 8 - Servicing data 1425 - 001 - 03.06.2020...
  • Page 9 HS 166A 8~12 Nm M6 x 70.5 (2) 8~12 Nm M6 x 20 (2) 1425 - 001 - 03.06.2020 Servicing data - 9...
  • Page 10 HS 139A 55~65 Nm Torque 14 mm Special Nut 8~12 Nm Torque 8~12 Nm Torque M6 x 72 Stud Bolt M6 x 78 (2) Stud Bolt 8~12 Nm Torque M6 x 30 (1) Bolt 8~12 Nm Torque M6 x 16.5 (4)
  • Page 11 HS 166A 55~65 Nm Torque 14 mm Special Nut 8~12 Nm Torque 8~12 Nm Torque M6 x 72 Stud Bolt M6 x 78 (2) Stud Bolt 8~12 Nm Torque M6 x 22 (2) Bolt 8~12 Nm Torque M6 x 16.5 (4) Bolt 1425 - 001 - 03.06.2020 Servicing data - 11...
  • Page 12 8~12 Nm Torque M6 x 25 (10) Bolt 11-13 Nm Torque M6 x 26 (2) Bolt 12 - Servicing data 1425 - 001 - 03.06.2020...

  • Page 13: Function Overview

    5 Function overview 5.1 Product overview HS 139A 1. Engine shroud 6. Fuel tank 2. Nut 7. Fuel tank screws 3. Engine cover 8. Crankcase 4. Flywheel housing 5. Fuel tank cap 1425 - 001 - 03.06.2020 Function overview- 13...

  • Page 14: Product Overview

    5.2 Product overview HS 166A 1. Engine shroud 7. Fuel tank screws 2. Nut 8. Crankcase 3. Engine cover 4. Flywheel housing 5. Fuel tank cap 6. Fuel tank 14 - Function overview 1425 - 001 - 03.06.2020...

  • Page 15: Serial Numbers On The Product

    5.3 Serial numbers on the product The engine serial number is found on the rear side of the engine. 1425 - 001 - 03.06.2020 Function overview- 15...

  • Page 16: Repair Instructions

    Clean and examine all parts fully. You find more • Always use original spare parts. instructions in the chapter for each part if special tools or procedures are necessary. 6.2 Starter HS 139A HS 166A 1. Retainer screw 2. Starter pawl holder 3. Washer 4. Friction spring 5.
  • Page 17 6.2.1 To remove and install the starter pulley 6.2.2 To disassemble the starter unit 1. Remove the engine cover. WARNING: Use protective glasses. The recoil spring can eject from the starter pulley and 2. Remove the starter rope handle from the starter cause injury.
  • Page 18 6.2.3 To assemble the starter pulley 6. Put the starter pawls and the return springs in position. Make sure that the end of the starter pawls WARNING: Use protective glasses. The recoil are put into the slot in the starter pulley. spring can eject from the starter pulley and cause injury.
  • Page 19 6.2.5 To replace a damaged starter rope 7. Put the new starter rope through the hole in the starter housing and in the rope pulley. 1. Remove the engine cover. 8. Attach the starter rope to the starter pulley. Install 2.

  • Page 20: Air Filter

    6.3 Air filter CAUTION: Do not use solvent or compressed air to clean the paper filter. 6.3.1 To remove and install the air filter 3. Put the air filter back. Make sure that the air filter WARNING: Use protective gloves. fully seals against the air filter holder.

  • Page 21: Carburetor

    6.4 Carburetor HS 139A 1. Idle adjustment screw 14. Drain plug gasket 2. Pilot screw 15. Drain plug 3. Throttle shaft 16. Float bowl 4. Gasket 17. Gasket 5. Heat shield 18. Float bowl screw 6. Gasket 19. Governor rod 7.

  • Page 22: Carburetor

    6.5 Carburetor HS 166A 1. Idle adjustment screw 23. Governor arm bolt 2. Throttle return spring 24. Governor arm nut 3. Pilot screw 25. Governor control 4. Throttle shaft 26. Governor pin 5. Governor shaft 6.5.1 To remove and install the carburetor HS 6.
  • Page 23 3. Disconnect the fuel hose from the carburetor. 6. Remove the carburetor and related gaskets and insulator. 4. Disconnect the governor and the choke linkage rods. 7. Install in the opposite sequence. 6.5.2 To remove and install the carburetor HS 166A To remove and install 1.
  • Page 24 a) Push the throttle rod out of the slot on the throttle 5. Lift and remove the throttle shaft and the throttle shaft. return spring. b) Lift and remove the throttle rod. 6. Disconnect the governor rod from the governor shaft.
  • Page 25 b) Lift and remove the governor rod. 6.5.3 To disassemble the carburetor To remove and 1. Remove the air filter holder. Refer to install the air filter holder on page 20 . 2. Clean the external surface of the carburetor. Refer To clean and examine the carburetor on page 26 .
  • Page 26 6. Put a thin mandrel (E) into the hole on the carburetor 13. Measure the distance between the end of the idle body. adjustment screw and the screw hole. 14. Remove the idle adjustment screw. 15. Remove the O-ring and the pilot screw. 6.5.4 To clean and examine the carburetor 1.
  • Page 27 4. Lower the carburetor in a container with gasoline to 18. Remove remaining parts of the gasket from the air find leaks. intake of the carburetor and install a new gasket. 5. Make sure that there are no leaks. 19. Replace the gasket on the heat shield. 20.
  • Page 28 3. Remove the governor rod (A) from the governor arm b) Lift and remove the governor rod. (B). 4. Remove the governor spring from the governor control and the governor arm. 3. Remove the governor rod (A) from the governor arm 5.

  • Page 29: Muffler

    6.6 Muffler 6.6.1 To remove and install the muffler 1. For HS 139A, remove the engine cover. 1. Remove the muffler cover (A). 2. Remove the screws that hold the muffler cover. 3. Remove the muffler cover.

  • Page 30: Ignition System

    6.7 Ignition system 6.7.2 To examine the spark plug CAUTION: Always use the recommended spark 6.7.1 To remove and install the ignition module plug type. Incorrect spark plug type can cause 1. Remove the 3 nuts. damage to the product. 2.

  • Page 31: Fuel Tank

    6. Use the knob (D) to adjust the distance between the 8. Examine the distance between the flywheel magnet 2 electrodes to 6 mm. and the ignition module with the air gap gauge. For Standard dimensions and the correct value, refer to Note: 6 mm is 6 marks on the scale.
  • Page 32 31 . 2. Remove the engine cover. 3. Remove the 2 screws and remove the fuel tank. HS 139A 3. Tighten the fuel tank cap fully. 4. Increase the negative pressure in the tank. If the negative pressure holds, replace the fuel tank cap.

  • Page 33: Flywheel

    6.9 Flywheel 4. Make sure all oil is drained before you move the product. 6.10.2 To fill the crankcase with oil 1. Put the product on a flat surface. 2. Remove the oil filler cap. 3. Fill the crankcase with oil. The oil level must be in between the marks on the dipstick.
  • Page 34 10. Remove the crankshaft. 6.10.5 Assemble the piston and piston connecting 11. Pull out the piston and connecting rod. 1. Install the connecting rod. 12. Remove the camshaft assembly. 6.10.4 To disassemble the piston and piston connecting rod 1. Disassemble the crankcase. Refer to disassemble the crankcase on page 33 .
  • Page 35 4. Install the oil ring (C) , the second ring (B) and the 4. Align the mark on the camshaft sprocket with the top ring (A), with the clearance 120° from each other mark on the crankshaft. (D). ○ 5. Install the connecting rod as shown in the illustration.
  • Page 36 8. Install the 10 screws that hold the crankshaft 3. Remove the 4 screws on the cylinder head cover. together. 4. Remove the cylinder head cover and the gasket. 5. Remove the locknuts. 6. Remove the adjustment nuts. 7. Remove the rocker arms, valve adjustment bolts and the rod plate.

  • Page 37: Function Test

    11. Remove the inlet valve and the exhaust valve. Make 4. Turn the cylinder valves until you can see an notes of which one of the valves is the inlet valve approximately 0.8 mm wide matt grey stripe around and which is the exhaust valve. the valve heads.
  • Page 38 6. Measure the clearance between the rocker arms Standard dimensions and the valve stems. Refer to and wear limits on page 45 . 7. If the clearance is not correct, adjust the valve play. To adjust the valve play on page 38 . Refer to 8.

  • Page 39: Troubleshooting

    7 Troubleshooting 7.1 Troubleshooting schedule Start Cause Solution The product does not Out of fuel. Fill fuel tank. start. The engine oil level is low. Do a check of the engine oil. Add engine oil if it is necessary. Ignition wire is disconnected from spark plug. Connect ignition wire to spark plug. Incorrect electrode gap on the spark plug.
  • Page 40 Increase and de- Cause Solution crease engine speed The engine speed The fuel filter is blocked. Clean the fuel filter. Replace the fuel filter if it cannot be increased. is necessary. The fuel hose is blocked. Clean the fuel hose. Replace the fuel hose if it is necessary.

  • Page 41: Technical Data

    8 Technical data 8.1 Technical data HS 139A HS 166A Brand Husqvarna Husqvarna Engine type Single cylinder, 4-Stroke, Single cylinder, 4-Stroke, Forced Air Cooling, OHV Forced Air Cooling, OHV Displacement, cm Idle speed, rpm 1800±150 1800±150 Max. engine speed, rpm 2900±100...

  • Page 42: Power Speed Curve

    8.2 Power speed curve HS 139A HS 166A P (kW) / (HP) P (kW) / (HP) Me (N.m) Me (N.m) 5.00 10.00 10.00 5.00 9.00 4.50 9.00 4.50 4.00 8.00 8.00 4.00 3.50 7.00 7.00 3.50 6.00 3.00 6.00 3.00 P (kW) 2.50...

  • Page 43: Dimensions

    8.3 Dimensions HS 139A 23°±0.1° 60°±0.1° 2XØ8.7±0.1 Ø2013.2±0.1 Cylinder Head 3XØ8.8±0.1 49°±0.1° 23°±0.1° 53°±0.1° Ø25.4 2xØ16 15° R0.5 8.4 - R1.5 3/8-24UNF-2B 3/8-24UNF-2B R7.5 Ø22.2 - 0.025 6.6 - 1425 - 001 - 03.06.2020 Technical data- 43...
  • Page 44 HS 166A 5XØ8.8±0.1 Ø203.2±0.1 Engine Mount Surface 2xØ16 Ø 25 - 0.025 R05(min) 3/8-24UNF-2B 44 - Technical data 1425 - 001 - 03.06.2020...

  • Page 45: Tightening Torques

    8.4 Tightening torques Item Screw Thread Torque, Nm Connecting rod bolt M6×1.0 Flywheel nut M14×1.5 (special nut) 55-65 Rocker arm pivot M6×0.5 (special nut) Pivot locknut M8×1.25 Crankcase cover bolt M6×1.0 Muffler bolt M6×1.0 Air filter nut M6×1.0 Engine cover nut M6×1.0 Fuel tank bolt M6×1.0...
  • Page 46 Part Tool Standard dimension Wear limit Connecting rod Feeler gauge Axial clearance: 0.10-0.70 Axial clearance: 1.1 mm / mm / 0.004-0.028 in. 0.043 in. Crankshaft pin Micrometer Outer diameter: Outer diameter: 25.920mm / 25.980-25.993 mm / 1.0205 in. 1.0228-1.0228 in. Valve, inlet valve Feeler gauge Clearance: 0.10-0.15 mm /...
  • Page 47 1425 - 001 - 03.06.2020 Technical data- 47...
  • Page 48 1142191-26 2020-06-12...

This manual is also suitable for:

Hs 166a

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