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Stihl MS 291 User Manual

Stihl MS 291
110 pages
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STIH)
STIHL MS 271, 291
2010-06

Table of Contents

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Stihl MS 291 Specifications

General IconGeneral
Engine Power2.8 kW
Displacement55.5 cm³
Weight5.6 kg
Vibration Level (left/right)4.5/4.5 m/s²
Guide Bar Length16 in to 20 in
Fuel Tank Volume460 ml
Chain Pitch3/8"
Fuel Capacity500 cc

Summary

Introduction and Safety Precautions

Introduction

Service manual details repair and servicing procedures for the power tool.

Safety Precautions

Safety regulations and warnings for operating and maintaining the machine.

Specifications

Engine Specifications

Technical data for engine displacement, bore, stroke, power, and speed.

Fuel System Specifications

Specifications for carburetor leakage, tank vent, and fuel type.

Ignition System Specifications

Specifications for ignition module air gap and spark plug details.

Chain Lubrication Specifications

Details of the speed-controlled oil pump and delivery rate.

Tightening Torques

Troubleshooting

Clutch Troubleshooting

Troubleshooting clutch issues like saw chain stopping or rotating at idle.

Chain Drive, Brake, Tensioner Troubleshooting

Troubleshooting chain sprocket wear, chain stopping, and brake activation.

Chain Lubrication Troubleshooting

Troubleshooting no oil, losing oil, or insufficient oil delivery.

Rewind Starter Troubleshooting

Troubleshooting issues with starter rope breakage, rewind, or pulling resistance.

Ignition System Troubleshooting

Troubleshooting engine running rough, misfires, or irregular spark.

Carburetor Troubleshooting

Troubleshooting carburetor flooding, engine stalling, and poor acceleration.

Engine Troubleshooting

Troubleshooting engine starting issues, low power, erratic running, and overheating.

Clutch

Clutch Drum Procedures

Procedures for removing, installing, and inspecting the clutch drum.

Clutch Assembly Procedures

Procedures for troubleshooting and removing/installing the clutch assembly.

Chain Brake

Checking Chain Brake Operation

Procedures for checking the efficiency and operation of the chain brake.

Brake Band Removal and Installation

Steps for removing and installing the brake band.

Brake Lever Removal and Installation

Procedures for removing and installing the brake lever and its components.

QuickStop Super Brake Lever

Procedures for brake lever on models with QuickStop Super.

Brake Cable Adjustment

Procedures for adjusting the brake cable for proper coasting brake operation.

Brake Cable Removal and Installation

Steps for disassembling and reassembling the brake cable and retainer.

Cam Lever Procedures

Procedures for removing and installing the cam lever.

Pin Installation and Removal

Procedures for removing and installing anchor and pivot pins.

Chain Tensioner Procedures

Procedures for removing, inspecting, and reassembling the chain tensioner.

Quick Chain Tensioner Installation

Procedures for installing and checking the quick chain tensioner.

Bar Mounting Studs Procedures

Procedures for installing bar mounting studs, including repair solutions.

Engine Service

Muffler Removal and Installation

Procedures for removing, installing, and checking the muffler and its gasket.

Leakage Test Procedures

Procedures for performing vacuum and pressure tests to detect leaks.

Leakage Test Preparations

Steps to prepare the engine for leakage tests.

Vacuum Leakage Test

Procedure for testing engine for leaks using vacuum.

Pressure Leakage Test

Procedure for testing engine for leaks using pressure.

Oil Seal Replacement

Procedures for replacing soft and hard oil seals on ignition and clutch sides.

Shroud Removal and Installation

Procedures for removing and installing the engine shroud.

Cylinder and Crankshaft Procedures

Procedures for removing and installing the cylinder and crankshaft assembly.

Crankshaft and Bearings Procedures

Procedures for removing and installing crankshaft and ball bearings.

Piston Removal and Installation

Procedures for removing and installing the piston, piston pin, and rings.

Piston Ring Procedures

Procedures for installing new piston rings.

Ignition System Service

Ignition Timing Information

Information on ignition timing being fixed and not adjustable.

Preseparator Procedures

Procedures for removing and checking the preseparator.

New Ignition Module Installation

Procedures for installing a new ignition module.

Ignition Module Testing

Procedures for testing the ignition module using ZAT testers.

Spark Plug Boot and Ignition Lead

Procedures for checking and installing the spark plug boot and ignition lead.

Flywheel Removal and Installation

Procedures for removing and installing the flywheel.

Short Circuit Wire Information

Information on the combined ground and short circuit wires.

Short Circuit Wire Testing

Procedures for testing the short circuit wire for continuity.

Short Circuit Wire Removal and Installation

Procedures for removing and installing the short circuit wire and wiring harness.

Ground Wire Procedures

Procedures for testing and installing the ground wire.

Contact Spring Procedures

Procedures for removing and installing the contact spring.

Ignition System Troubleshooting Guide

Flowchart for troubleshooting engine not running and spark issues.

Rewind Starter

Rewind Starter General Information

General troubleshooting for stiff or slow rewinding starter ropes.

Fan Housing Removal and Installation

Procedures for removing and installing the fan housing.

Pawl Removal and Installation

Procedures for removing and installing pawls and spring clips.

ErgoStart Component Procedures

Procedures for removing and installing ErgoStart components like pawls and springs.

Rope Rotor Procedures

Procedures for relieving spring tension and removing/installing the rope rotor.

Starter Rope and Grip Procedures

Procedures for removing and installing the starter rope and grip.

Rewind Spring Tensioning

Procedures for tensioning the rewind spring correctly.

Rewind Spring Replacement

Procedures for replacing a worn or broken rewind spring.

Servicing the AV System

Annular Buffer and AV Spring on Oil Tank

Procedures for replacing AV buffer and spring on the oil tank.

AV Spring on Fuel Tank

Procedures for replacing the AV spring on the fuel tank.

AV Spring on Handlebar

Procedures for replacing the AV spring located on the handlebar.

Stop Buffer at Clutch Side

Procedures for replacing the stop buffer on the clutch side.

Stop Buffer at Ignition Side

Procedures for replacing the stop buffer on the ignition side.

Buffers on Filter Base

Procedures for replacing buffers located on the filter base.

New Handlebar Installation

Procedures for installing a new handlebar.

Control Levers

Master Control Lever Procedures

Procedures for removing and installing the master control lever.

Throttle Trigger/Lockout Lever Procedures

Procedures for removing the handle molding for throttle/lockout lever.

QuickStop Super Throttle/Lockout Lever

Procedures for throttle trigger/lockout lever on QuickStop Super models.

QuickStop Super Switch Lever

Procedures for removing and installing the switch lever on QuickStop Super models.

QuickStop Super Lockout Lever

Procedures for removing and installing the lockout lever on QuickStop Super models.

Choke Rod Procedures

Procedures for removing and installing the choke rod.

Throttle Rod Procedures

Procedures for removing and installing the throttle rod.

Chain Lubrication

Pickup Body Procedures

Procedures for removing and installing the pickup body and cleaning the oil tank.

Oil Suction Hose Procedures

Procedures for removing and installing the oil suction hose.

Oil Pump Procedures

Procedures for removing and installing the oil pump and its components.

Valve Procedures

Procedures for removing and installing the tank vent valve.

Fuel System

Air Filter Procedures

Procedures for checking, cleaning, and replacing the air filter.

Baffle Removal and Installation

Procedures for removing and installing the baffle.

Filter Base Removal and Installation

Procedures for removing and installing the filter base.

Air Guide Shroud Procedures

Procedures for removing and installing the air guide shroud.

Air Guide Shroud for Manual Fuel Pump Models

Procedures for air guide shroud on models with manual fuel pump.

Carburetor Removal and Installation

Procedures for removing and installing the carburetor.

Carburetor Leakage Test

Procedures for testing carburetor leaks using a pressure pump.

Carburetor Servicing

Procedures for servicing the carburetor's metering diaphragm, inlet needle, and pump diaphragm.

Adjusting Carburetor Screws

Procedures for adjusting carburetor screws and replacing limiter caps.

Carburetor Adjustment Procedures

Procedures for performing basic and standard carburetor settings.

Carburetor Carrier Removal

Procedures for removing the carburetor carrier.

Intake Manifold Procedures

Procedures for removing and installing the intake manifold.

Tank Vent Testing and Procedures

Procedures for testing and removing/installing the tank vent.

Fuel Intake Procedures

Procedures for fuel intake system components like pickup body and fuel hose.

Manual Fuel Pump Procedures

Procedures for removing and installing the manual fuel pump.

Tank Housing Procedures

Procedures for removing and installing the tank housing.

Special Servicing Tools

List of Special Servicing Tools

List of special tools with part numbers and applications.

Servicing Aids

List of Servicing Aids

List of servicing aids like grease, lubricants, and sealants.