Stihl MS 171 User Guide

Stihl MS 171 Manual

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  • Stihl MS 171 | User Guide - Page 1
    STIH) STIHL MS 171, 181, 211 2007-05
  • Stihl MS 171 | User Guide - Page 2
    9.7 Ignition System Troubleshooting 49 7. Chain Brake 22 7.1 Chain Tensioner 27 10.5 Rope Rotor 55 7.7 Bar Mounting Studs 27 10.6 Starter Rope / Grip 55 10.7 Tensioning the Rewind Spring 57 10.8 Replacing the Rewind Spring 58 RA_533_00_01_01 MS 171, MS 181, MS 211 q © ANDREAS STIHL
  • Stihl MS 171 | User Guide - Page 3
    Carrier 90 Tank Vent 92 Testing 92 Removing and Installing 93 Manual Fuel Pump 93 Fuel Intake 94 Pickup Body 94 Fuel Intake Hoses 95 Fuel Hoses, Tank Vent / Manual Fuel Pump 96 Fuel Tank Cap 97 15. Special Servicing Tools 98 16. Servicing Aids 100 2 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 4
    . Refer to the latest edition of the relevant parts list to check the part numbers of any replacement parts. A fault on the machine may have several causes. To help locate the fault, consult the chapter on "Troubleshooting" and the "STIHL Service Training System" for all assemblies. Refer to the
  • Stihl MS 171 | User Guide - Page 5
    is started up in the course of repairs or maintenance work, observe all local and countryspecific safety regulations as well as the safety precautions and warnings in the instruction manual. 533RA000 TG After disengaging the chain brake and removing the chain sprocket cover, bar and chain, the
  • Stihl MS 171 | User Guide - Page 6
    0.5 bar Fuel: as specified in instruction manual Air gap between ignition module and fanwheel: Spark plug (suppressed): Electrode gap: 0.15...0.35 mm NGK CMR 6H 0.5 mm Fully automatic, speed-controlled oil pump with reciprocating piston Oil delivery rate: 7.0 cm³/min at 10,000 rpm MS 171, MS
  • Stihl MS 171 | User Guide - Page 7
    Collar screw engine housing/guide bar, 16.0 front Screw P 4x16 Cover, chain brake/engine housing 2.0 (repair solution) Screw D 5x16 Cover, chain brake/engine housing 2.0 (repair solution) Countersunk screw M 6x14 Replacement chain catcher (repair 4.0 solution) Screw P 5x20 Filter
  • Stihl MS 171 | User Guide - Page 8
    and P screws max. 500 rpm Do not use a impact wrench for releasing or tightening screws. Do not mix up screws with and without binding head MS 171, MS 181, MS 211 7
  • Stihl MS 171 | User Guide - Page 9
    bores worn Replace clutch shoes or install new clutch Loud noises Clutch springs stretched or fatigued Replace all clutch springs Needle cage damaged Fit new needle cage Clutch shoe retainer broken Fit new retainer Clutch shoes and carrier worn Install new clutch 8 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 10
    new clutch drum Check freedom of movement and operation of brake band Saw chain does not stop immediately when brake is activated Brake spring stretched or broken Fit new brake spring Brake band stretched or worn Clutch drum worn Fit new brake band Fit new clutch drum MS 171, MS 181, MS 211 9
  • Stihl MS 171 | User Guide - Page 11
    In the event of trouble with the chain lubrication system, check and . rectify other sources of faults before disassembling the oil pump. Condition Chain receives no oil Cause Remedy Oil tank empty Fill up with oil, check oil pump Oil inlet hole in guide bar is blocked Clean oil
  • Stihl MS 171 | User Guide - Page 12
    Insufficient spring tension Rewind spring worn Clean or replace rewind spring Check rewind spring and increase tension Fit new and reduce tension Starter rope can be pulled out almost without resistance (crankshaft does not turn) Versions with ErgoStart Guide peg on MS 171, MS 181, MS 211 11
  • Stihl MS 171 | User Guide - Page 13
    while carrying out maintenance and repair work on the ignition replace ignition module if necessary. Check operation of spark plug, clean spark plug and replace if necessary. A problem with the carburetor or the engine can also be the reason for erratic running behavior. 12 MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 14
    insulation or short in short circuit wire Check short circuit wire for short circuit to ground Break in ignition lead or insulation Check ignition lead, replace ignition damaged module if necessary Ignition module faulty Install new ignition module MS 171, MS 181, MS 211 13
  • Stihl MS 171 | User Guide - Page 15
    Remove and clean or replace the inlet needle, clean the carburetor, replace inlet needle if necessary Inlet control lever sticking on spindle Clean inlet control lever, replace if necessary Helical Fit new metering diaphragm Manifold damaged Install new manifold 14 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 16
    not close Replace throttle rod and lever Idle jet bores or ports blocked Idle jet too rich or too lean Setting of idle speed (LA) incorrect - throttle shutter completely closed Clean the carburetor Set low speed screw (L) correctly Set idle speed screw (LA) correctly MS 171, MS 181, MS 211 15
  • Stihl MS 171 | User Guide - Page 17
    running too rich, low power Air valve does not open fully in full Check lever on air valve and and low maximum speed throttle position replace if necessary Erratic idle - too lean Air valve does not close properly Check lever on air valve and replace if necessary 16 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 18
    Check tank vent and replace if necessary Check air valve and replace if necessary Engine overheating Insufficient cylinder cooling. Air inlets in fan housing blocked or cooling fins on cylinder very dirty Thoroughly clean all cooling air openings and the cylinder fins MS 171, MS 181, MS 211 17
  • Stihl MS 171 | User Guide - Page 19
    replacement chain catcher can be fitted if the integral chain catcher on the chain sprocket cover is worn. - Remove the chain sprocket cover, bar and chain, b 5 - File down the damaged chain catcher on the chain sprocket cover. - Install in the reverse sequence. Machines with quick chain tensioner
  • Stihl MS 171 | User Guide - Page 20
    all parts, b 16 - Replace any damaged parts. 533RA014 TG : Unscrew the spark plug (1). 533RA008 TG 2 1 1 533RA011 TG Disassembling - Clamp the clutch in a vise. : Use hook (2) 5910 890 2800 to remove the clutch springs (1). : Slip the retainers (1) onto the clutch shoes. MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 21
    . - Tightening torques, b 3.5 - Remove the locking strip from the cylinder. - Reassemble all other parts in the reverse sequence. TOP 533RA017 TG Attach the springs to the side with the raised hexagon (arrow that the raised hexagon (arrow) faces outwards. 533RA020 TG 20 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 22
    wear. Remove and install the clutch drum (1), see instruction manual. If there are signs of serious wear on the inside diameter of the clutch drum (1), check the remaining wall thickness. If it is less than about 80% of the original thickness, install a new clutch drum. MS 171, MS 181, MS 211 21
  • Stihl MS 171 | User Guide - Page 23
    1 - Troubleshooting, b 4.2 - Remove the chain sprocket cover, bar and chain, b 5 : Disengage the chain brake by pulling the hand guard (1) towards the front handle - the brake band is loose. - Remove the clutch drum, b 6.1 - Push the hand guard (1) towards the guide bar - the brake band is tensioned
  • Stihl MS 171 | User Guide - Page 24
    parts of outside diameter) and its remaining thickness is less than 0.6 mm. : Push the brake band (1) into its guides (arrows). If the pegs have broken off, the cover can be serviced drum, b 6.1 - Reassemble all other parts in the reverse sequence. - Check operation. MS 171, MS 181, MS 211 23
  • Stihl MS 171 | User Guide - Page 25
    2 2 1 533RA040 TG 533RA037 TG 533RA035 TG 1 - Troubleshooting, b 4.2 : Remove the E-clip (arrow). - Remove pins and replace the brake lever. if necessary, b 7.5 1 - Inspect the flat spring and replace if necessary., b 7.4 1 - Clean all disassembled parts, b . 24 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 26
    If this is not the case, replace the brake spring. 533RA046 TG : Use assembly tool (2) 1117 890 0900 to attach the brake spring (1) to the anchor pin (arrow). - Reassemble all other parts in the reverse sequence. pins, moving the hand guard to and fro at the same time. MS 171, MS 181, MS 211 25
  • Stihl MS 171 | User Guide - Page 27
    replace if necessary. 1 : Push the flat spring (1) into the guides (arrows). - Lubricate the flat spring, b 16 - Reassemble all other parts - use suitable support. : Use a suitable punch to drive out the pin (3) in the direction of the clutch - use suitable support. 1 - Before MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 28
    , bar and chain, b 5 : Push stud puller 5910 893 0501 (1) over the collar stud (2) as far as it will go. Unscrew the stud. : Unscrew collar stud (3). 533RA004 TG - Clean all disassembled parts, b 16 : Remove the screw (arrow). 533RA056 TG - Lubricate the chain tensioner with STIHL multipurpose
  • Stihl MS 171 | User Guide - Page 29
    repair the fuel system, carburetor, air filter and ignition system before looking for faults on the engine. - Troubleshooting out the screws (arrows). - Remove the muffler (1), check and replace if necessary. 533RA061 TG : Use suitable pliers to pull out , b 3.5 28 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 30
    if not impossible. Moreover, the transition from idle speed to part or full throttle is not smooth. Always perform the vacuum completely fill the space between the two screws. - Remove the carburetor, b 14.3 1 : Check that the sleeve (1) is in place. 8.2.1 Preparations 1 MS 171, MS 181, MS 211 29
  • Stihl MS 171 | User Guide - Page 31
    Connect pressure hose (1) of pump 0000 850 1300 to nipple (arrow). - Install the carburetor, b 14.3 - Loosen the muffler and remove the sealing plate. - Tighten down the muffler firmly. - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 30 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 32
    care not to damage the crankshaft stub. - Remove the chain sprocket cover, bar and chain, b 5 - Remove the clutch, b 6 - TG 1 : Remove and inspect the worm (1), and replace if necessary. 1 The seating face must be flat and parts in the reverse sequence. 533RA078 TG MS 171, MS 181, MS 211 31
  • Stihl MS 171 | User Guide - Page 33
    the crankshaft stub as far as stop - it must engage the oil pump pinion. - Reassemble all other parts in the reverse sequence. 8.4 Removing and Installing the Shroud 1 533RA083 TG 533RA082 TG : Push slide lock little and pull it off in the direction of the rear handle. 32 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 34
    the carburetor carrier, b 14.7.1 1 : Take the engine (1) out of the engine housing. After loosening the engine pan, always clean the sealing faces and apply fresh sealant, b 16 The carburetor carrier can be also be removed after the engine has been removed. 533RA092 TG MS 171, MS 181, MS 211 33
  • Stihl MS 171 | User Guide - Page 35
    Reassemble all other parts in the reverse support engine pan from below with one hand. - Remove the engine, b 8.5 : Pry the engine pan (1) away from the engine at the lugs (arrows). - Remove the engine pan. : Pull the oil seals (arrows) off the crankshaft stub. 533RA099 TG 34 MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 36
    faces must be clean and show no signs of damage. Parts with damaged sealing faces must be replaced. Use oil seal (1) 9638 003 1581 if the (1) and replace if necessary, b 14.7 If a new cylinder is installed, transfer the intake manifold (if it is still serviceable) from the MS 171, MS 181, MS 211 35
  • Stihl MS 171 | User Guide - Page 37
    residue if necessary, b 16 The mating faces must be perfectly clean and not be damaged in any way. Replace parts with damaged mating faces. : Apply sealant along the groove, b 16 - Remove the engine, b 8.5 - the ball bearing (1) off the clutch end of the crankshaft. 36 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 38
    to the connecting rod.. 1 533RA123 TG 533RA120 TG MS 171, MS 181, MS 211 : Use a suitable tool to ease the hookless snap rings out of the grooves in the piston bosses (arrow). : Remove the piston (1) from the connecting rod. - Inspect the piston rings and replace if necessary, b 8.8.1 37
  • Stihl MS 171 | User Guide - Page 39
    2210. : Press the installing tool downwards into the sleeve until the magnet butts against the end of the guide slot. Use a suitable base (wooden board). - Position the piston on the connecting rod. 533RA128 TG (2) on the assembly drift (1) and slide it into the piston. 38 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 40
    piston rings and replace if necessary., b 8.8.1 : Apply the installing tool 5910 890 2210 with the sleeve's taper against the piston boss, hold the the piston, b 8.8 - Remove the piston rings from the piston - the MS 171 has only one piston ring. : Position the piston rings so that the radii at
  • Stihl MS 171 | User Guide - Page 41
    extreme caution when troubleshooting and carrying out maintenance or repair work on the ignition system. The high voltages which occur can cause serious or even fatal accidents. Troubleshooting on the ignition on the coil body: : Remove the ignition module (1). 40 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 42
    the lugs (arrows) on the bosses. : Fit the ground wire replace if necessary, b 9.4 - Troubleshooting, b 4.5 533RA145 TG 533RA148 TG 1 : Fit the retainer (1). 1 : Fit the wire terminal (1) so that it is against the stop (arrow) and insert the screw - do not tighten down yet. MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 43
    parts in the reverse sequence. 9.2 Ignition Timing Ignition timing is fixed and cannot be adjusted during repair tester's window (2). The engine may start and accelerate during the test. To 5910 850 4520. the aid of the troubleshooting chart, The ignition test refers only to MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 44
    tester's window (3). 95,6 mm The engine may start and accelerate during the test. If a spark check the ignition system with the aid of the troubleshooting chart, b 9.7 - Use a pointed tool to in a safe place. Keep fingers or other parts of your body at least 1 cm away MS 171, MS 181, MS 211 43
  • Stihl MS 171 | User Guide - Page 45
    , check the pawls and replace if necessary, b 10.4 If the flywheel is stuck, use the puller. - Reassemble all other parts in the reverse sequence. parts in the reverse sequence. - Tightening torques, b 3.5 533RA159 TG - Unscrew the puller and remove the flywheel. 44 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 46
    reverse sequence. : Take out the screw and remove the ground wire (2). 533RA163 TG 1 2 - Pull the short circuit and ground wires out of the guides (arrows). : Disconnect connectors of short circuit wire (1) and ground wire (2). - Remove the wiring harness. 533RA165 TG MS 171, MS 181, MS 211 45
  • Stihl MS 171 | User Guide - Page 47
    the short circuit wire (1) and ground wire (2) and replace wiring harness if necessary. A faulty ground wire can impair the switch shaft. 533RA170 TG The cable tie (2) must rest on the guide and point in the direction of the cylinder - do not move the cable . 533RA173 TG 46 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 48
    lead, b 9.1 533RA179 TG - Check air gap on ignition module and adjust if necessary, b 9.1.1 - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 : Push the contact spring (1) into its seat until the lug (arrow) snaps into position. MS 171, MS 181, MS 211 47
  • Stihl MS 171 | User Guide - Page 49
    close to the housing and properly seated in the guides, b 9.6.2 - Reassemble all other parts in the reverse sequence. 1 - Tightening torques, b 3.5 533RA173 TG : Position the ground wire (1) against the protective rib (arrow) - to avoid unintentional disconnection 48 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 50
    Ignition System Troubleshooting Engine does not run Switch shaft: - in position "#"? Check the spark plug: - Smeared with oil, black? - Sooted? - Electrode gap correct? - Contacts shorted? - Clean or replace the 4 (use ZAT 3 as main spark gap - see TI 32.94), b 9.3 1 MS 171, MS 181, MS 211 49
  • Stihl MS 171 | User Guide - Page 51
    , replace wiring harness if necessary, b 9.6.1 Check ignition lead: - Severe chafing? - Spark plug boot: Holes/cracks? - Resistance: spark plug boot to ground: spec. 1.5 - 12 kΩ If necessary, install new spark plug boot and/or ignition lead with ignition module, b 9.4 2 3 50 MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 52
    necessary, install new wiring harness, b 9.6.2 Powerful yes spark? no Install new ignition module, b 9.1.1 yes Machine runs trouble-free, no further action necessary Engine runs MS 171, MS 181, MS 211 no -Look for fault in fuel system or carburetor - Check engine for leaks - Check position
  • Stihl MS 171 | User Guide - Page 53
    boss (arrow) and remove the fan housing (2). 1 : Fit and tighten down the screws (arrows) firmly - the hand guard is secured with the screw (1) and washer. - Tightening torques, b 3.5 533RA184 TG 533RA182 TG : Push the locking tab (arrow) to one side and take out the segment (1). 52 MS 171, MS
  • Stihl MS 171 | User Guide - Page 54
    - tension is now relieved. - Remove the fan housing and, if necessary, the segment, b 10.1 and b 10.2 Check that washer (3) is in place. 533RA188 TG : Position the spring clip (1) so that its loop engages the peg on the pawl and its curved part (arrow) is in the starter post's groove. MS 171, MS
  • Stihl MS 171 | User Guide - Page 55
    - Inspect the spring housing (1), carrier (2), pawls (3) and torsion springs (4) and replace if necessary. : Fit the washer (1). : Push the spring housing (2) over the do not overstretch. - Reassemble all other parts in the reverse sequence. - Clean the pawls (1), b 16 54 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 56
    and uncoil. - Check the rope rotor and replace if necessary. - Coat bore in rope rotor with STIHL special lubricant, b 16 1 2 - remaining rope from the rotor, b 10.6 The system will not be under tension if either the starter rope or rewind spring is broken. - Remove the MS 171, MS 181, MS 211 55
  • Stihl MS 171 | User Guide - Page 57
    recess (arrow). - Pull any remaining rope out of the sleeve. Inspect the individual parts and replace if necessary. Do not shorten the starter rope. - Press the cap into the starter grip. 1 533RA208 TG : Thread the starter rope (1) through the guide bushing (arrow). 56 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 58
    before maximum spring tension is reached. If this is not the case, reduce spring tension since there is otherwise tension: Pull the rope out, hold the rope rotor steady and take off one turn of the rope. - Install the fan housing and, if necessary, the segment, b 10.1 and b 10.2 MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 59
    the Rewind Spring - Troubleshooting, The replacement spring comes ready for installation in a tension of rewind spring if necessary and remove the rope rotor, b 10.5 - Remove any remaining pieces of old spring. - Lubricate the spring with a few drops of STIHL arrow). 58 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 60
    peg(s) on pawl(s) with grease, b 16 - Tension the rewind spring, b 10.7 : Press the installing parts in the reverse sequence. - Tightening torques, b 3.5 533RA216 TG The open side of the anchor loop (arrow) must face inwards. Then fit the rewind spring (1) counterclockwise. MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 61
    The anti-vibration spring is located in the area of the fuel tank and secured to the underside of the machine. - Remove the chain sprocket cover, bar and chain, b 5 533RA226 TG - Remove the shroud, b 8.4 : Remove the screw (arrow). - Lower the handle frame (1) a little. 60 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 62
    the screw (arrow). - Insert screw and tighten it down firmly. - Reassemble all other parts in the reverse sequence. - Inspect the bearing plug (1), spring (2) and retainer (3) and replace if necessary. - Take out the anti-vibration spring. - Tightening torques, b 3.5 MS 171, MS 181, MS 211 61
  • Stihl MS 171 | User Guide - Page 63
    replace damaged parts. 533RA233 TG - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 11.4 Handle Frame : Remove the screw (arrow). 533RA244 TG - Remove the chain sprocket cover, bar and chain handle frame to the right and take it out. 62 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 64
    it down firmly. - Check that handle frame is properly seated. - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 533RA232 TG : Insert and firmly tighten down the screws (arrows) of the antivibration springs on the oil tank and cylinder. MS 171, MS 181, MS 211 63
  • Stihl MS 171 | User Guide - Page 65
    position when the throttle trigger is operated. - l = cold start - cold engine is started in this position - Remove the filter base, b 14.2 - Remove the handle molding, b 12.2 : Disconnect the shaft and lever. - Inspect the switch shaft and lever and replace if necessary. 64 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 66
    arrow) above the switch shaft (1). : Ease the switch shaft (1) into the guide until it snaps into position. : Push connector of short circuit wire (1) into . The wires must be laid close to the housing and properly seated in the guides. 533RA255 TG 1 : Line up the switch shaft (1) and push it into
  • Stihl MS 171 | User Guide - Page 67
    replace if necessary. - Install the throttle rod, b 14.6 1 - Install the handle molding, 2 b 12.2 533RA247 TG 533RA267 TG - Reassemble all other parts its mounts and lift it away. 533RA260 TG - Remove the filter base, b 14.2 : Use a screwdriver to ease the lugs (arrows) apart and push them
  • Stihl MS 171 | User Guide - Page 68
    engages the guide (arrow). 1 : Attach the throttle rod (1) to the throttle trigger (arrow). Make sure the throttle rod is properly located in the mounts, b 14.6 2 . - Check operation. - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 MS 171, MS 181, MS 211 67
  • Stihl MS 171 | User Guide - Page 69
    oil to the bar and chain. In the event of problems with the oil supply system, first check the oil tank and the pickup body. Clean the oil tank if necessary. - Troubleshooting, - Open the the oil suction hose with pickup body, inspect it and replace if necessary. 68 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 70
    (1) until the tab is completely flush with the guide (arrow) in the engine housing - oil suction engine housing. - Reassemble all other parts in the reverse sequence. - Tightening pump from the puller. Inspect it and replace if necessary. 13.3 Removing and Installing MS 171, MS 181, MS 211 69
  • Stihl MS 171 | User Guide - Page 71
    engine housing, b 13.2 533RA292 TG - If necessary, inspect the worm and replace it if necessary, b 8.3 - Install the handle frame, b 11.4 : Remove the old valve (1) from the oil tank. - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 70 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 72
    instruction manual. - Open the tank cap. 533RA293 TG Check correct installed position. : Insert the valve in the housing bore (arrow). 533RA187 TG : Disconnect the nipple inside the tank (arrow). - Inspect the tank cap and replace other parts in the reverse sequence. MS 171, MS 181, MS 211 71
  • Stihl MS 171 | User Guide - Page 73
    a little and remove the air filter (1). - Check the air filter and clean of replace if necessary - see instruction manual. - Install in the reverse sequence. 1 2 2 - Push the filter base (1) onto the studs (2). : Fit the screws (arrows) and tighten them down firmly. 72 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 74
    and repair or replace if necessary. 1 1 Machines with manual fuel pump : Push the fuel hose (1) onto the stub (arrow). - Attach the choke rod, b 14.6 - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 533RA238 TG Sleeve (1) must be in place. MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 75
    14.3.1 Leakage Test In the case of problems with the carburetor or fuel supply system, also check and clean or replace the tank vent, b 14.8 14.4 Servicing the Carburetor 2 14.4.1 Metering Diaphragm The carburetor can be tested for leaks with the pump 0000 850 1300. - Remove the carburetor, b 14
  • Stihl MS 171 | User Guide - Page 76
    shows signs of fatigue, i.e. the diaphragm distorts and swells and has to be replaced. - Position the end cover (1) so that the lever (arrow) is opposite the levers must remain constant. - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 MS 171, MS 181, MS 211 75
  • Stihl MS 171 | User Guide - Page 77
    Inspect and replace if necessary. Make sure the spring locates on the control lever's nipple. - Press the inlet control lever down and secure it with the screw. - Check that inlet control lever moves freely. - Install the metering diaphragm, b 14.4.1 533RA309 TG - Reassemble all other parts in
  • Stihl MS 171 | User Guide - Page 78
    jet and carburetor bore are not damaged. - Reassemble all other parts in the reverse sequence. 14.4.5 Pump Diaphragm 533RA318 TG : Carefully remove the gasket with pump ) points towards the carburetor bore. - Remove the carburetor, b 14.3 : Remove the screw (arrow). MS 171, MS 181, MS 211 77
  • Stihl MS 171 | User Guide - Page 79
    replaced. parts in the reverse sequence. 533RA320 TG 533RA323 TG : Use a needle to remove the fuel strainer (1) from the carburetor body. 1 - Install in the reverse sequence. - Line up the end cover (1) so that the shoulder (arrow) points towards the throttle shutter. 78 MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 80
    starting position The torsion springs (arrows) be preloaded when attached to the levers. 533RA328 TG 533RA329 TG : Remove the E-clip (arrow). - Pull out the air valve shaft (1) and disconnect and relax the torsion spring (2) at the same time. - Clean the air valve shaft and guides, b 16 MS 171
  • Stihl MS 171 | User Guide - Page 81
    troubleshooting, 533RA335 TG : Position leg of torsion spring against web (arrow) on valve body. 533RA332 TG - Hold the air valve shaft in the preloaded position. : Slide the air valve (1), with the hole (2) on the left and the marking visible, into the slot in the shaft. 80 MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 82
    arrow). 1 - Check the choke shaft (1) and torsion spring (2) and replace if necessary. : Fit the E-clip (arrow) and let go of the position (arrow) of torsion spring (2). - Clean the choke shaft and guides, b 16 - Install in the reverse sequence. 533RA343 TG - Turn the MS 171, MS 181, MS 211 81
  • Stihl MS 171 | User Guide - Page 83
    , b 14.3 533RA348 TG - Carburetor troubleshooting, 2 : Turn the throttle shaft a little and pull out the throttle shutter (1). 3 1 533RA346 TG 533RA349 TG 1 2 : Remove the screw (arrow). 1 - Relieve tension parts in the reverse sequence. 82 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 84
    the parts and replace if guides, b 16 : Fit the strainer (3) in the bore first. Then fit the spring (2) and pump piston (1) in the bore (arrow). 533RA355 TG 2 1 1 : Fit the E-clip (1). 533RA352 TG 3 - Check the throttle shaft (1) and torsion spring (2) and replace MS 171, MS 181, MS 211 83
  • Stihl MS 171 | User Guide - Page 85
    the lever (1) clockwise until its arm can be fitted against the stop (arrows) and the lever (1) engages the two flats on the throttle shaft. 84 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 86
    , b 14.3 533RA364 TG - See also carburetor troubleshooting, : problem may be the adjusting screws. 533RA365 TG : Inspect the tip (arrow) for damage or wear and replace the screw if necessary. - Screw down the low speed screw L as far as stop. - Continue with high speed screw MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 87
    arrow) for damage or wear and replace the screw if necessary. - Screw home high speed screw H as far as stop. - Carry out basic setting, b 14.5.1 14.5 Adjusting the Carburetor 14.5.1 Basic Setting The basic setting : Press the limiter cap (1) onto the high speed screw H. 86 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 88
    14.5.2 Standard Setting The limiter caps must not be removed for the standard setting. Always perform the following steps before carrying out any adjustments: - Troubleshooting, - Check chain tension and adjust if necessary. - Inspect the spark arresting screen (if fitted) and clean or replace if
  • Stihl MS 171 | User Guide - Page 89
    parts in the reverse sequence. - Pull the throttle rod (1) out of its mount (arrow). - Remove the throttle rod. Check it and replace if necessary. 533RA382 TG 2 533RA380 TG 1 : Pass the throttle rod (1) under the throttle trigger (2) and push it into the hole (arrow). 88 MS 171, MS 181, MS
  • Stihl MS 171 | User Guide - Page 90
    other parts in the reverse sequence. - Tightening torques, b 3.5 533RA385 TG : Inspect and clean the sealing face (arrow) on the cylinder, b 16 The sealing face must be perfectly clean and not be damaged in any way. Components with damaged sealing faces must be replaced. MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 91
    the guide (arrow). : Open the shutter (1), if fitted, and push it out of its seat (arrow). - Pull the manifold flanges into position with one hand until they completely fill the bores. - Check the shutter and replace it if necessary. - Install in the reverse sequence. 90 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 92
    damaged. 533RA398 TG 533RA395 TG : Push the carburetor carrier (1) into the guides (arrows) in the engine housing as far as stop. When installing, make is properly seated in its guides. - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 MS 171, MS 181, MS 211 91
  • Stihl MS 171 | User Guide - Page 93
    Fuel Pump 1 - Remove the manual fuel pump, b 14.8.3 - Pull the fuel hose (1) out of the guides. - Disconnect the fuel hose from the fuel pump (1). : Seal the fuel hose (1) with a plug (arrow). 533RA262 TG 533RA402 TG - Clean the area around the tank vent. - If necessary, replace the tank vent or
  • Stihl MS 171 | User Guide - Page 94
    . - Tightening torques, b 3.5 : Press the retaining tabs (arrows) together and pull out the fuel pump (1). 14.8.3 Manual Fuel Pump - Pull the fuel pump (1) off the fuel hose (2). Not installed in all machine versions. A faulty manual fuel pump must be replaced. MS 171, MS 181, MS 211 93
  • Stihl MS 171 | User Guide - Page 95
    saw vigorously : Push the fuel hose (1) into its guides (arrows). - Check operation. - Open the tank again and drain it Dispose of fuel properly in accordance with environmental requirements. - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 14.9 Fuel Intake 14
  • Stihl MS 171 | User Guide - Page 96
    b 14.3 - Remove the pickup body, b 14.9.1 : Disconnect the fuel hose from the carburetor carrier (arrow). : Inspect fuel hoses (1+2) and elbow connector (3) and replace if - Coat with STIHL Press Fluid, b 16 533RA416 TG : Pull the fuel hose (1) out of the fuel tank. MS 171, MS 181, MS 211 95
  • Stihl MS 171 | User Guide - Page 97
    14.8.2 533RA425 TG : Inspect the connector (1) and grommet (2) and replace if necessary. - Connector (3) is installed in machines with a manual fuel pump. : Pull off and inspect the fuel hose (1) and replace if necessary. - Install in the reverse sequence. 533RA392 TG 1 96 533RA424 TG MS 171
  • Stihl MS 171 | User Guide - Page 98
    hose (1) onto the connector (arrow). - Install the manual fuel pump (if standard), b 14.8.3 - Reassemble all other parts in the reverse sequence. - Tightening torques, b 3.5 : Disconnect the nipple inside the tank (arrow). - Check the tank cap and replace sealing ring or tank cap. - Install in
  • Stihl MS 171 | User Guide - Page 99
    3124, 13 mm 13 Puller 14 Setting gauge 15 Ignition system tester, ZAT 4 16 Ignition system tester, ZAT 3 Part No. 5910 890 3101 5910 5910 850 4520 Application Rem. Holding saw for repairs (includes mount 5910 850 1650) Clamping saw to assembly stand (only for assembly MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 100
    Torque wrench 28 Torque wrench 29 Screwdriver bit, T 27 x 125 Part No. 5910 890 4400 0000 893 3706 0000 893 3711 1123 893 in piston Attaching clutch springs Removing bar mounting studs Installing rope guide bushing Rewinding rewind spring Removing pickup only. MS 171, MS 181, MS 211 99
  • Stihl MS 171 | User Guide - Page 101
    16. Servicing Aids No. Part Name Part No. 1 Lubricating grease (225 g tube) 0781 120 1111 2 STIHL special lubricant 0781 417 1315 3 Press Fluid OH 723 0781 957 9000 4 STIHL multipurpose grease sealing faces and carburetor, crankshaft stubs and flywheel taper 100 MS 171, MS 181, MS 211
  • Stihl MS 171 | User Guide - Page 102
    englisch / english 0455 533 0123. M7. F7. FST. Printed in Germany
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STIH)
STIHL MS 171, 181, 211
2007-05