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Stihl MS 231 User Manual

Stihl MS 231
114 pages
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STIH)
STIHL MS 231, 251
2010-10
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Table of Contents

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Stihl MS 231 Specifications

General IconGeneral
Power-to-Weight Ratio2.4 kg/kW
Oilomatic Chain Pitch3/8" P
Sound Pressure Level103 dB(A)
Sound Power Level114 dB(A)
Engine Power2.0 kW
Weight4.8 kg
Bar Length35 cm / 40 cm
Fuel Capacity390 cc
Chain Oil Capacity200 ml
Vibration Level Left/Right3.0/3.0 m/s²

Summary

1. Introduction and Safety Precautions

1.1 Introduction

Explains the purpose and use of the service manual, parts lists, and technical information.

1.2 Safety Precautions

Lists safety regulations, hazards of gasoline, ignition system, and handling hot components.

2. Specifications

2.1 Engine

Details engine displacement, bore, stroke, power, speed, clutch engagement, and leakage tests.

2.2 Fuel System

Lists leakage test specifications for the carburetor and tank vent, and fuel type.

2.3 Ignition System

Provides specifications for air gap, spark plug type, and electrode gap.

2.4 Chain Lubrication

Details the speed-controlled Ematic oil pump and its oil delivery rate.

2.5 Tightening Torques

Lists fasteners, thread sizes, components, torque values, and remarks for assembly.

3. Troubleshooting

3.1 Clutch

Lists conditions, causes, and remedies for clutch-related issues like chain stopping or loud noises.

3.2 Chain Drive, Chain Brake, Chain Tensioner

Addresses issues with chain sprocket wear, chain stopping, and brake activation problems.

3.3 Chain Lubrication

Lists causes and remedies for chain receiving no oil, losing oil, or delivering insufficient oil.

3.4 Rewind Starter

Details troubleshooting for broken starter ropes, rewind issues, and difficulty pulling.

3.5 Ignition System

Covers engine running issues, irregular sparks, and causes related to spark plug, flywheel, and ignition module.

3.6 Carburetor

Lists causes and remedies for carburetor flooding, poor acceleration, and power loss.

3.7 Engine

Addresses issues with starting, full power delivery, erratic running, and engine overheating.

4. Clutch

4.1 Clutch Drum

Explains how to remove, install, and inspect the clutch drum for wear.

4.2 Clutch

Refers to troubleshooting, clutch drum removal, and shroud removal.

5. Chain Brake

5.1 Checking Operation

Details how to check the chain brake's efficiency and proper function.

5.2 Brake Band

Explains how to remove and install the brake band, and when to replace it.

5.3 Brake Lever

Describes removing and installing the brake lever, including spring attachment.

5.4 Brake Lever on Machines with QuickStop Super

Details removal and installation of the brake lever on specific models.

5.4.1 Adjusting the brake cable

Explains how to adjust the brake cable for proper coasting brake operation.

5.4.2 Brake cable Removing and Installing

Provides steps for removing and installing the brake cable assembly.

5.5 Chain Tensioner

Details how to remove and install the chain tensioner components.

5.5.1 Quick Chain Tensioner

Explains the quick chain tensioner installation within the sprocket cover.

5.5.2 Chain Catcher

Describes how to remove and install the chain catcher, an integral part of the sprocket cover.

5.6 Bar Mounting Stud

Covers removing, installing, and repairing the bar mounting stud.

6. Engine

6.1 Muffler

Details how to remove, install, and check the muffler and exhaust gasket.

6.2 Leakage Test

Outlines steps before performing leakage tests, including removing shroud and spark plug.

6.2.1 Preparations

Outlines steps before performing leakage tests, including removing shroud and spark plug.

6.2.2 Vacuum Test

Explains how to perform a vacuum test to check oil seals for leaks.

6.2.3 Pressure Test

Details how to perform a pressure test for engine airtightness.

6.3 Oil Seals

Describes removing and installing oil seals on the ignition side of the engine.

6.3.1 Ignition side

Describes removing and installing oil seals on the ignition side of the engine.

6.3.2 Clutch side

Details removing and installing oil seals on the clutch side of the engine.

6.4 Shroud

Explains how to remove and install the engine shroud.

6.5 Engine

Covers removing the engine, checking sealing faces, and general engine removal steps.

6.6 Cylinder / Crankshaft

Details removing the engine pan, crankshaft, and installing new oil seals.

6.7 Bearings / Crankshaft

Explains removing and installing crankshaft, ball bearings, and oil seals.

6.8 Piston

Covers removing and installing the piston, including piston pins and rings.

6.9 Piston Rings

Details inspecting and installing piston rings, ensuring correct groove and orientation.

7. Ignition System

7.1 Ignition Timing

States that ignition timing is fixed and not adjustable during repair.

7.2 Preseparator

Describes how to remove and check the preseparator.

7.3 Install new ignition module

Provides steps for removing the old ignition module and installing a new one.

7.4 Testing the Ignition Module

Explains how to test the ignition module using a ZAT tester for spark output.

7.5 Spark Plug Boot / Ignition Lead

Covers removing and installing the spark plug boot and ignition lead as a unit.

7.6 Flywheel

Details removing and installing the flywheel, including checking for damage.

7.7 Short Circuit Wire

Explains testing the short circuit wire for continuity and breaks.

7.7.1 Testing

Explains testing the short circuit wire for continuity and breaks.

7.7.2 Removing and Installing

Provides steps for removing and installing the short circuit wire and ground wire.

7.7.3 Ground Wire

Describes testing and installing the ground wire, similar to the short circuit wire.

7.7.4 Contact Spring

Details how to install and check the contact spring's seating and operation.

7.8 Ignition System Troubleshooting

Provides a flowchart for diagnosing ignition system problems.

8. Rewind Starter

8.1 General

Discusses stiffness and slow rewinding of the starter rope due to dirt or temperature.

8.2 Fan housing

Explains how to remove and install the fan housing and segment.

8.3 Pawls

Details removing and installing pawls and spring clips, including models with ErgoStart.

8.4 ErgoStart

Covers removing, installing, and checking the ErgoStart mechanism and its components.

8.5 Rope Rotor

Explains how to relieve spring tension, remove, and install the rope rotor.

8.6 Starter Rope / Grip

Details removing and installing the starter rope and grip.

8.7 Tensioning the Rewind Spring

Describes how to tension the rewind spring after rope installation.

8.8 Replacing the Rewind Spring

Provides instructions for replacing the rewind spring, including safety precautions.

9. Servicing the AV System

9.1 AV Spring on Oil Tank

Details removing and installing AV springs located on the oil tank underside.

9.2 AV Spring on Fuel Tank

Explains removing and installing AV springs located on the fuel tank.

9.3 AV Spring on Handlebar

Covers removing and installing AV springs located between the handle frame and cylinder.

9.3.1 Stop Buffers

Details removing and installing stop buffers between engine and tank housings.

9.3.2 Buffers on Filter Base

Explains removing and installing buffers located on the filter base.

9.4 Handlebar

Details removing and installing the handlebar.

10. Control Levers

10.1 Master Control Lever

Covers removing and installing the Master Control Lever.

10.1.1 Removing and Installing

Provides steps for removing and installing the Master Control Lever.

10.2 Throttle Trigger/Lockout Lever

Details removing and installing the throttle trigger and lockout lever.

10.3 Throttle Trigger/Lockout Lever – QuickStop Super

Covers removal/installation of trigger/lever for QuickStop Super models.

10.3.1 Switch Lever QuickStop Super

Details removing and installing the switch lever for QuickStop Super models.

10.3.2 Lockout Lever – QuickStop Super

Explains removing and installing the lockout lever for QuickStop Super models.

10.3.3 Choke Rod

Details removing and installing the choke rod.

10.3.4 Throttle Rod

Explains removing and installing the throttle rod.

11. Chain Lubrication

11.1 Pickup Body

Discusses impurity buildup in the pickup body filter and its effect on oil supply.

11.2 Oil Suction Hose

Covers removing and installing the oil suction hose and pickup body.

11.3 Oil Pump

Details removing and installing the oil pump, including worm and drive spring.

11.4 Valve

Explains the function of the valve and how to replace it if faulty.

12. Fuel System

12.1 Air Filter

Discusses the impact of dirty air filters on engine performance and how to check/clean.

12.2 Baffle

Details removing and replacing the baffle.

12.3 Filter Base

Explains removing and installing the filter base.

12.4 Air Guide Shroud

Covers removing and installing the air guide shroud.

12.4.1 Air Guide Shroud – Models with Manual Fuel Pump

Specific instructions for air guide shroud on models with a manual fuel pump.

12.5 Carburetor

Details removing and installing the carburetor.

12.5.1 Leakage Test

Explains how to test the carburetor for leaks using a pump.

12.6 Servicing the Carburetor

Details removing and installing the metering diaphragm and gasket.

12.6.1 Metering Diaphragm

Details removing and installing the metering diaphragm and gasket.

12.6.2 Inlet Needle

Covers removing and installing the inlet needle and control lever.

12.6.3 Pump Diaphragm

Explains removing and installing the pump diaphragm and gasket.

12.6.4 Lever on Throttle Shaft

Details removing and installing the lever on the throttle shaft.

12.6.5 Adjusting Screws

Explains how to adjust the high, low, and idle speed screws on the carburetor.

12.7 Adjusting the Carburetor

Outlines the procedure for the basic setting of the carburetor after component replacement.

12.7.1 Basic Setting

Outlines the procedure for the basic setting of the carburetor after component replacement.

12.7.2 Standard setting

Describes the standard setting procedure for the carburetor, including engine idle adjustment.

12.8 Carburetor Carrier

Details removing and installing the carburetor carrier.

12.9 Intake Manifold

Explains how to remove, inspect, and install the intake manifold.

12.10 Tank Vent

Describes testing the tank vent function using pressure and vacuum tests.

12.10.1 Testing

Describes testing the tank vent function using pressure and vacuum tests.

12.10.2 Removing and Installing

Provides steps for removing and installing the tank vent and cover.

12.11 Fuel Intake

Discusses fuel starvation due to clogged pickup body filter and its removal.

12.11.1 Pickup Body

Discusses fuel starvation due to clogged pickup body filter and its removal.

12.11.2 Fuel Hose

Details removing and installing fuel hoses, including connectors and grommets.

12.11.3 Fuel Hoses – Manual Fuel Pump

Specific instructions for fuel hoses on models with a manual fuel pump.

12.11.4 Manual Fuel Pump

Covers removing and installing the manual fuel pump.

12.11.5 Tank Housing

Details removing and installing the tank housing, including AV springs and stop buffers.

13. Special Servicing Tools

13. Special Servicing Tools

Lists special tools required for servicing, with part numbers and applications.

14. Servicing Aids

14. Servicing Aids

Lists various servicing aids like greases, lubricants, and sealants.

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