Stihl MS 311 Manual
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Stihl MS 311 Manual

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STIH)
STIHL MS 311, 391
2009-06

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Summary of Contents for Stihl MS 311

  • Page 1 STIH) STIHL MS 311, 391 2009-06...

  • Page 2: Table Of Contents

    General Cam Lever Fan housing Pins 8.2.1 Segment Chain Tensioner Pawls Bar Mounting Studs Rope Rotor Starter Rope / Grip Tensioning the Rewind Spring Replacing the Rewind Spring © ANDREAS STIHL AG & Co. KG, 2009 MS 311, MS 391...
  • Page 3 12.8 Carburetor Carrier 12.9 Intake Manifold 12.10 Tank Vent 12.10.1 Testing 12.10.2 Removing and Installing 12.11 Fuel Intake 12.11.1 Pickup Body 12.11.2 Fuel Hose 12.11.3 Fuel Suction Hose 12.11.4 Tank Housing Special Servicing Tools Servicing Aids MS 311, MS 391...

  • Page 4: Introduction And Safety Precautions

    Use the part numbers to detailed descriptions of all the repair identify the tools in the and servicing procedures specific to "STIHL Special Tools" manual. The this power tool. manual lists all special servicing tools currently available from You should make use of the STIHL.

  • Page 5: Safety Precautions

    Spilled replacement parts. Do not re-use fuel hoses after fuel must be wiped away They can be identified by the STIHL removal. Always install new hoses immediately. part number, the { logo – fuel hoses can be overstretched and the STIHL parts symbol K during removal.

  • Page 6: Specifications

    Speed-controlled oil pump with reciprocating piston and manual flow control Oil delivery rate: 11.5 (+2.5) cm /min Ematic oil pump at 10,000 rpm Oil delivery rate: 6.0 (+/-2.0)...17.5 (+3.0 / -4.5) Adjustable oil pump /min at 10,000 rpm MS 311, MS 391...

  • Page 7: Tightening Torques

    1) 3) Screw M 8x1 Flywheel/crankshaft 33.0 Carburetor/collar stud Screw P 4x14 Pre-separator / engine housing Screw P 4x12 Cover plate/fan housing Spark plug M 14x1.25 Spark plug 25.0 Screw D 4x18 Ignition module / engine pan MS 311, MS 391...
  • Page 8 Power screwdriver setting for polymer: DG and P screws max. 500 rpm Do not use an impact wrench for releasing or tightening screws. Do not mix up screws with and without binding heads. MS 311, MS 391...

  • Page 9: Troubleshooting

    Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Needle cage damaged Fit new needle cage Clutch shoe retainer broken Install new retainer or clutch Clutch shoes and carrier worn Install new clutch MS 311, MS 391...
  • Page 10 Replace the clutch springs Saw chain does not stop Brake spring stretched or broken Fit new brake spring immediately when brake is activated Brake band stretched or worn Fit new brake band Clutch drum worn Install new clutch drum MS 311, MS 391...

  • Page 11: Chain Lubrication

    Install new oil pump Worm drive spring not engaged in Engage drive spring in notch in clutch drum clutch drum Oil pump delivery rate set too low Adjust oil pump (only on version with adjustable oil pump) MS 311, MS 391...
  • Page 12 (spring degreasant (containing no windings stick together) chlorinated or halogenated hydrocarbons), then pull rope carefully several times until normal action is restored Decompression valve is not open Open, check and replace decompression valve if necessary MS 311, MS 391...

  • Page 13: Ignition System

    Check ignition lead/ignition module and replace ignition module if necessary. Check operation of spark plug. Clean the spark plug or replace if necessary. Engine housing damaged (cracks) Install new engine housing MS 311, MS 391...
  • Page 14 Diaphragm gasket leaking Fit new diaphragm gasket Metering diaphragm damaged or Fit a new metering diaphragm shrunk Tank vent faulty Replace tank vent Leak on fuel hose from tank to Seal connections or install new fuel carburetor hose MS 311, MS 391...
  • Page 15 Saw chain rotates at idle speed Engine idle speed too high Readjust with idle speed screw LA (counterclockwise) Clutch springs stretched or fatigued Replace the clutch springs or install new clutch Clutch spring hooks broken Replace the clutch springs MS 311, MS 391...
  • Page 16 Erratic idle – too lean Air valve does not close completely Check the end cover with air valve and replace if necessary Intake manifold faulty Install new intake manifold MS 311, MS 391...

  • Page 17: Engine

    Close, check and replace decompression valve if necessary Engine overheating Insufficient cylinder cooling. Air Thoroughly clean all cooling air inlets in fan housing blocked or openings and the cylinder fins cooling fins on cylinder very dirty MS 311, MS 391...

  • Page 18: Clutch

    0000 893 5903 into the spark correct operation of the clutch. plug hole, wide end first, so that "OBEN-TOP" faces up. : Use hook (2) 5910 890 2800 to remove the clutch springs (1). MS 311, MS 391...
  • Page 19 : Position the clutch on the crankshaft stub so that the raised hexagon (arrow) faces outwards. : Check the clutch – all springs (arrows) must be properly attached. : Clamp the clutch in a vise (arrow). MS 311, MS 391...

  • Page 20: Clutch Drum

    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. – Install the clutch drum. MS 311, MS 391...

  • Page 21: Chain Brake

    Do not overstretch the brake band. the eye. – Pull the hand guard towards the If the chain brake does not operate handlebar to simplify assembly of properly, refer to troubleshooting, the brake band. b 3.2. MS 311, MS 391...
  • Page 22 : Push the brake band (1) into its seat (arrow) as far as stop. : Hold the brake band (1) sideways, attach it to the brake lever (2) and then swing it in the direction of its seat. MS 311, MS 391...

  • Page 23: Brake Lever

    : Pull the hand guard (1) and brake lever (2) off the pivot pins – Remove the sleeve (1). (arrows) together. – Lift the hand guard a little and – Remove the hand guard and remove the fan housing. brake lever. MS 311, MS 391...
  • Page 24 : Turn the cam lever (1) to one side until the cam of the hand guard (arrow) slips passed it. – Push the hand guard bearing boss and the brake lever on to the pivot pins. MS 311, MS 391...

  • Page 25: Cam Lever

    – Reassemble all other parts in the reverse sequence. – Lubricate the cam lever, b 14 : Disconnect the spring (1) from the anchor pin (2). : Remove the E-clip (3). – Pull off the cam lever. MS 311, MS 391...

  • Page 26: Pins

    14 : Drive home pins (3, 4 and 5) as specified below. : Position the new pin in the bore (arrow) so that the knurling on the pin meshes with the existing knurling in the bore. MS 311, MS 391...

  • Page 27: Bar Mounting Studs

    – Clean all disassembled parts, and (2) of collar studs with b 14 threadlocking adhesive, b 14 – Lubricate thread with STIHL – Fit the collar studs and tighten multipurpose grease, b 14 them down firmly. – Reassemble in the reverse –...

  • Page 28: Engine

    (2). Always replace components with – Fit and tighten down the screws damaged sealing faces. (2) firmly. – Fit new plugs. : Take out the screws (1). : Remove the muffler (2). MS 311, MS 391...

  • Page 29: Leakage Test

    0000 855 8107 between the cylinder exhaust port and muffler and tighten down the screws moderately. The sealing plate must completely fill the space between the two screws. – Remove the carburetor, b 12.5 MS 311, MS 391...

  • Page 30: Vacuum Test

    – Reassemble all other parts in the there is no internal counterpressure. reverse sequence. A test can be carried out with pump 0000 850 1300 to detect this kind of fault. MS 311, MS 391...
  • Page 31 The seating face must be flat and free from burrs. – Free off the oil seal in its seat by – Wait about one minute, then tapping it with a suitable tube or a rotate the crankshaft several punch. times. MS 311, MS 391...

  • Page 32: Shroud

    : Use press sleeve (1) 1122 893 2405 to install the oil seal (2). The seating face must be flat and free from burrs. : Take out the screws (arrows). : Remove the shroud (1). MS 311, MS 391...

  • Page 33: Cylinder / Crankshaft

    – Check the crankshaft and ball : Take out the screws (arrows). bearings and replace if necessary, b 6.6 – Inspect the piston and piston rings and replace if necessary, b 6.7, b 6.8 MS 311, MS 391...
  • Page 34 : Pull the oil seals (arrows) off the crankshaft stubs. : Fit the E-clip (1). Use oil seal (1) 9638 003 1581 for replacement on closed engine. Use oil seal (2) 9639 003 1585 for replacement on opened engine. MS 311, MS 391...
  • Page 35 (arrows) in the cylinder. Viewed from the exhaust – Hold the crankshaft (1) steady. port (arrow), the long crankshaft stub (1) must be on the right. : Fit the cylinder (2) with crankshaft (1) in the engine housing. MS 311, MS 391...

  • Page 36: Bearings / Crankshaft

    – Install the piston, b 6.7 : Pull the ball bearing (1) off the – Install the crankshaft and oil tapered crankshaft stub. seals, b 6.5 MS 311, MS 391...

  • Page 37: Piston

    (arrow) points to the rear and the long crankshaft : Remove the sleeve (1) from the stub (1) is on the right. installing tool (2) 5910 890 2212. – Place the piston on the connecting rod. MS 311, MS 391...
  • Page 38 The inner pin (1) must point towards the flat face. the flat face (2) of the tool's shank. Fit the snap ring (1) so that its gap (arrow) points either up or down. MS 311, MS 391...

  • Page 39: Piston Rings

    – Fit the decompression valve and tighten it down firmly. – Reassemble all other parts in the reverse sequence. : Use a piece of old piston ring to scrape the grooves (arrows) clean. MS 311, MS 391...

  • Page 40: Ignition System

    : Disconnect the short circuit wire (1). – The connector tag (2) for the short circuit wire : Take out the screws (2). : Remove the ground wire (3). – Remove the ignition module. MS 311, MS 391...
  • Page 41 (2) – do not tighten down yet. steady – it must point towards the cable guide. Crimped side of terminal must face – Tighten down the screws firmly. the screw head. – Remove the setting gauge. MS 311, MS 391...

  • Page 42: Testing The Ignition Module

    If a spark is visible, the ignition spark test, not to ignition timing. system is in order. – If no spark is visible in the window (2), check the ignition system with the aid of the troubleshooting chart, b 7.8 MS 311, MS 391...

  • Page 43: Spark Plug Boot / Ignition Lead

    7.8 – Coat the inside of the spark plug boot with STIHL press fluid, b 14 : Hold the ignition lead and leg spring together and push them into the spark plug boot.

  • Page 44: Flywheel

    The flywheel and magnet poles (arrows) must not be damaged or have turned blue. Replace flywheel if necessary. The flywheel and crankshaft stub must be free from grease before : Unscrew the flywheel nut (1). assembly. MS 311, MS 391...

  • Page 45: Short Circuit Wire

    : Pull the short circuit wire (1) out troubleshooting chart, b 7.8. of the guides (arrows). – Reassemble in the reverse : Pull the wiring harness (1) out of sequence. the guides (arrows). MS 311, MS 391...

  • Page 46: Installing

    (2) and : Push the protective tube (2) with swing it down. short circuit wire (1) into the guide (centered as shown). : Push the short circuit wire (1) into the guides (arrows). MS 311, MS 391...

  • Page 47: Ground Wire

    : Push the contact spring (1) onto the pins (arrows) as far as stop. : Move the switch shaft (1) – Reassemble all other parts in the towards the tank housing until the reverse sequence. contact spring (2) is free. MS 311, MS 391...
  • Page 48 : Lift the contact spring (1) and push it over the switch shaft. : Check operation. – short circuit wire's connector must touch the contact spring (arrow) in position " ". – Reassemble all other parts in the reverse sequence. MS 311, MS 391...

  • Page 49: Ignition System Troubleshooting

    – Boot damaged? – If necessary, install new spark plug boot and/ or leg spring, b 7.5 Test ignition system: with ZAT 3 or ZAT 4 (use ZAT 3 as main spark gap see TI 32.94), b 7.4 MS 311, MS 391...
  • Page 50 1.5 – 12 kΩ – Check resistance of ignition lead (spark plug boot and ignition module removed) Spec.: < 10 Ω, If necessary, install new spark plug boot and/or ignition lead with module, b 7.3 MS 311, MS 391...
  • Page 51 7.3 Engine runs? Machine runs trouble-free, – Look for fault in fuel system or no further action necessary carburetor – Check engine for leaks – Check position of flywheel on crankshaft, b 7.6, b 6.5 MS 311, MS 391...

  • Page 52: Rewind Starter

    Segment Before installing, lubricate the Pawls rewind spring and starter post with STIHL special lubricant, b 14. – Remove the fan housing, b 8.2 If clogged with dirt or pitch, the entire starter mechanism, including the rewind spring, must be removed and disassembled.

  • Page 53: Rope Rotor

    : Pull out the starter rope (1) : Push the straight part of the about 5 cm and hold the rope spring clip over the starter post rotor (2) steady. until it snaps into the groove. MS 311, MS 391...

  • Page 54: Starter Rope / Grip

    – Reassemble all other parts in the – Pull the old rope out of the starter reverse sequence. grip. : Pull the rope into the starter grip until the knot is properly seated in the grip (small arrow). MS 311, MS 391...

  • Page 55: Rewind Spring

    Hold the rope rotor steady since it will otherwise spin back and may damage the rewind spring. : Pull the rope (1) back into the rotor until the knot locates in the recess (arrow). MS 311, MS 391...

  • Page 56: Replacing The Rewind Spring

    Even a worn rewind spring is still pre-loaded in the installed condition. – Remove the frame. – Install the fan housing, b 8.2 – Place a blanket over the work area and pull the rewind spring out of the fan housing. MS 311, MS 391...
  • Page 57 – Install the rope rotor, b 8.4 – Reassemble all other parts in the reverse sequence. – Arrange the spring (1) in its original position. : Fit the anchor loop in its seat (arrow) in the fan housing. MS 311, MS 391...

  • Page 58: Servicing The Av System

    : Unscrew the AV spring (1). – Unscrew the bearing plug (2). : Pry out the AV spring (1). – Use STIHL press fluid to simplify assembly, b 14 : Push the buffer (2) onto the : Screw home the bearing plug (1) peg (1) on the handlebar as far as far as stop.

  • Page 59: Av Spring On Front Handle

    : Screw the AV spring (1) into the plug (arrow) on the tank housing as far as stop. – Push the AV spring (1) into its seat. : Take out the screws (1 and arrows). : Remove the complete AV spring (2). MS 311, MS 391...

  • Page 60: Handlebar

    : Take out the screw (1) and engine housing. remove the chain catcher (2). – Use STIHL press fluid to simplify assembly, b 14 – Use STIHL press fluid to simplify assembly, b 14...
  • Page 61 (arrow). – Insert the screws and tighten them down firmly. – Reassemble all other parts in the reverse sequence. : Push the handlebar, buffer (1) first, into the engine housing. MS 311, MS 391...

  • Page 62: Control Levers

    : Push the switch shaft (1) onto the pin (2). : Push the tabs (1) apart and through the tank housing. : Ease the interlock lever (1) out of its mounts (arrows). – Disconnect the torsion spring and remove the interlock lever. MS 311, MS 391...
  • Page 63 (arrow). both sides. : Attach the torsion spring (1) to the trigger (2) – note the installed position (arrow). : Attach the torsion spring (1) to the interlock lever (arrow). MS 311, MS 391...

  • Page 64: Choke Rod

    (arrow) and move the switch shaft (1) in the direction of cold start at the same time. : Engage the choke rod (1) in the bore (arrow) in the choke shaft (2). MS 311, MS 391...

  • Page 65: Throttle Rod

    90° at move upwards when the throttle bent end (1) is in front of the the same time. trigger is pulled. opening (arrow). – Reassemble in the reverse sequence. MS 311, MS 391...

  • Page 66: Chain Lubrication

    – the tab (arrow) must locate – Open the oil tank cap and drain against the housing. the oil tank. – Use STIHL press fluid to simplify – Collect chain oil in a clean assembly, b 14 container, b 1...

  • Page 67: Oil Pump

    : Pull the oil pump (1) off the nipple (2) and then lift it off over the crankshaft stub. : The spring (1) and worm (2) form a single unit and must be replaced if damaged. MS 311, MS 391...

  • Page 68: Valve

    – Reassemble all other parts in the – Check adjustment of oil pump reverse sequence. : Remove the old valve (1) from and readjust if necessary – see the oil tank. instruction manual. – Reassemble all other parts in the reverse sequence. MS 311, MS 391...

  • Page 69: Fuel System

    (3) first and then – Remove the choke rod, rubber buffer (2). b 10.2.1 – Reassemble in the reverse sequence. : Remove the filter base (1). – Disconnect the ground wire from the contact spring, b 7.7.4. MS 311, MS 391...

  • Page 70: Air Guide Shroud

    – Remove the throttle rod, b 10.2.2 – Remove the carburetor, b 12.5 : Push the filter base (1) fully into – Use STIHL press fluid to simplify the rubber buffer (arrow). – Remove the manifold, b 12.9 assembly, b 14...
  • Page 71 : Line up the air guide shroud (1) and hold the fuel hose (2) at the – Pay attention to mark when same time. installing the short circuit wire, b 7.7.2 – Reassemble all other parts in the reverse sequence. MS 311, MS 391...

  • Page 72: Carburetor

    (1). : Check that the sleeve (1) and washer (2) are in place. – Use STIHL press fluid to simplify assembly, b 14 – Install the filter base, b 12.3 – Install the air filter, b 12.1 –...

  • Page 73: Servicing The Carburetor

    – Reassemble all other parts in the replaced. reverse sequence. – Check the metering diaphragm for signs of damage and wear. Install a new gasket. MS 311, MS 391...

  • Page 74: Inlet Needle

    – Move the end cover (1) a little – Reassemble all other parts in the until the pegs engage the holes in reverse sequence. the end cover. : Remove the inlet needle (1). – Remove the spring (2). MS 311, MS 391...

  • Page 75: Pump Diaphragm

    – Check that the inlet control lever them very carefully. moves freely. – Install the metering diaphragm, b 12.6.1 : Fit the inlet needle (1). : Fit the spring (2) in the bore. : Carefully remove the pump diaphragm with gasket. MS 311, MS 391...
  • Page 76 (2) firmly. : Use a needle to remove the fuel – Reassemble all other parts in the strainer (1) from the carburetor reverse sequence. body. Clean or replace the fuel strainer. – Reassemble in the reverse sequence. MS 311, MS 391...

  • Page 77: Air Valve

    The air valve must move freely in both directions (open and closed) and always return to the idle position. The air valve is fully closed in the idle position. : Push the lever (1) onto the throttle shaft as shown (arrow). MS 311, MS 391...

  • Page 78: Adjusting Screws

    3.6 : Hold the lever (2) steady. : Pull off the grommet (1). : Rotate the lever (1) clockwise until it butts against the stop on lever (2) and engages the end of the throttle shaft. MS 311, MS 391...
  • Page 79 : Rotate the limiter cap until the lug – Screw down the low speed screw (2) is in line with the slot (1). (L) as far as stop. – Continue with the high speed screw (H). MS 311, MS 391...

  • Page 80: Carburetor Adjustment

    – Check the air filter and clean or – Carry out the basic setting, – Warm up the engine. replace if necessary, b 12.1 b 12.7.1 Setting disk 5910 893 6600 may be fitted on the screwdriver 5910 890 2304 to simplify adjustments. MS 311, MS 391...

  • Page 81: Standard Setting

    3,300 rpm. 4. Set the engine speed to 2,800 rpm with the low speed screw ( L). 5. Set engine's maximum speed to 13,000 rpm with the high speed screw (H). MS 311, MS 391...

  • Page 82: Carburetor Carrier

    – Remove the carburetor carrier (2). If the setting is made too lean there is a risk of engine damage as a result of lack of lubrication and overheating. MS 311, MS 391...

  • Page 83: Intake Manifold

    3.7 – Pull the manifold flanges into the openings in the carburetor carrier with the string. – Remove the string. MS 311, MS 391...

  • Page 84: Tank Vent

    12.11.4 (arrow). : Position the manifold (2) on the cylinder. : Fit and tighten down the screws (1) firmly. – Install the carburetor carrier, b 12.8 – Reassemble all other parts in the reverse sequence. MS 311, MS 391...

  • Page 85: Removing And Installing

    Pressure test – Coat sealing ring of new tank vent with STIHL press fluid, b 14 – Push home the tank vent by hand until it snaps into position. – Reassemble all other parts in the reverse sequence. : Take out the screw (1).

  • Page 86: Fuel Hose

    : Slide the wooden assembly block (1) between the engine housing and tank housing. : Take out the screws (arrows) and : Pull the fuel hose (2) off the pry the AV spring (1) out of the connector (1). handlebar. MS 311, MS 391...

  • Page 87: Fuel Suction Hose

    (2) as far as stop. engage the guide (arrow). b 12.11.1 Note position of the hose – Use STIHL press fluid to simplify – Remove the tank housing, – the flats (arrows) must be in assembly, b 14 b 12.11.4 alignment.

  • Page 88: Tank Housing

    – Push the connector (1) with fuel old tank housing that are not hose into the fuel suction hose. included with the replacement – see parts list. – Reassemble all other parts in the reverse sequence. MS 311, MS 391...

  • Page 89: Special Servicing Tools

    5910 850 4520 Testing ignition system Torque wrench 5910 890 0302 0.5 to 18 Nm Torque wrench 5910 890 0312 6 to 80 Nm Installing tool 12 5910 890 2212 Installing hookless snap rings in piston MS 311, MS 391...
  • Page 90 Removing limiter caps Stud puller M8 5910 893 0501 Removing bar mounting studs Socket, 13 mm, long 5910 893 2804 Removing and installing decompression valve Hook 5910 893 8800 Removing pickup body Remarks: 1) Use for releasing only. MS 311, MS 391...

  • Page 91: Servicing Aids

    Oil seals, sliding and bearing points STIHL special lubricant 0781 417 1315 Bearing bore in rope rotor, rewind spring in fan housing STIHL press fluid OH 723 0781 957 9000 Rubber components, AV elements STIHL multipurpose grease 0781 120 1109...
  • Page 92 MS 311, MS 391...
  • Page 93 MS 311, MS 391...
  • Page 94 englisch / english 0455 542 0123. M2,2. K09. FST. Printed in Germany...

This manual is also suitable for:

Ms 391

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