Stihl 064

STIHL 064, 066 1
SERVICE MANUAL
064 and 066
Chain Saws
As the design concept of these two models is
almost identical, the descriptions and
servicing procedures generally apply to both.
Differences are described in detail.
You should make use of the illustrated parts
lists while carrying out repair work. They
show the installed positions of the individual
components and assemblies. Microfilmed
parts list are always more up to date than
printed lists.
A fault on the machine may have several
causes. Consult the "troubleshooting charts"
when tracing faults.
Refer to the "Technical Information Bulletins"
for engineering changes which have been
introduced since publication of this service
manual.
Service manuals and technical information
bulletins describing engineering changes are
intended exclusively for the use of STIHL
servicing dealers and staff and must not be
passed on to third parties.
Chain saw on assembly stand
Servicing and repairs are made
considerably easier if the saw is mounted
on assembly stand 5910 850 3100 or 5910
890 3100. This enables the saw to be
swivelled to the best position for the
ongoing repair and thus leaves both hands
free.
The saw is can be quickly secured to the
stand by means of the two bar mounting
studs and nuts.
The STIHL Special Tools manual lists all
special servicing tools currently available
from STIHL.
Always use original STIHL replacement
parts.
Original STIHL parts can be identified by
the STIHl part number, the logo
and the STIHL parts symbol. (
The symbol may appear alone on small
parts.
©
1992
A
n
d
reas
Stihl
.
W
a
ibli
ngen

Stihl 064 Specifications

General

Brand	Stihl
Model	064
Category	Chainsaw
Language	English

Summary

1. SPECIFICATIONS

1.1 Engine

Engine specifications including displacement, bore, stroke, power output, and torque.

1.2 Fuel System

Details on carburetor settings, leakage tests, fuel capacity, and mixture.

1.3 Ignition System

Information on ignition type, air gap, timing, spark plug specifications, and LED function.

1.4 Cutting Attachment

Specifications for guide bars and bar lengths.

1.5 Tightening Torques

Table listing fasteners, thread sizes, torque values, and remarks.

1.6 Special Accessories

List of optional accessories available for users and service.

2. TROUBLESHOOTING CHARTS

2.1 Clutch, Chain Drive, Chain Brake and Chain Tensioner

Troubleshooting guide for clutch, chain drive, brake, and tensioner issues.

2.2 Engine

Troubleshooting common engine faults like starting, stalling, and power loss.

2.3 Ignition System

Diagnostic flowchart for ignition system faults.

2.4 Rewind Starter

Troubleshooting common issues with the rewind starter mechanism.

2.5 Chain Lubrication

Troubleshooting guide for chain lubrication system faults.

2.6 Fuel System

Troubleshooting common fuel system problems like carburetor flooding and poor acceleration.

3. CLUTCH, CHAIN DRIVE, CHAIN BRAKE AND CHAIN TENSIONER

3.1 Clutch DrumChain Sprocket

Steps for removing and installing the clutch drum and chain sprocket.

3.2 Clutch

Steps for removing and disassembling the clutch assembly.

3.3 Chain Brake

Detailed steps for disassembling the chain brake mechanism.

3.3.1 Disassembly

Detailed steps for disassembling the chain brake mechanism.

3.3.2 Assembly

Steps for reassembling the chain brake components.

3.4 Chain Tensioner

Procedures for removing and installing the chain tensioner.

3.5 Bar mounting studs

Instructions for removing and installing bar mounting studs.

4. ENGINE

4.1 Removing and Refitting Exhaust Muffler

Step-by-step guide for removing and installing the exhaust muffler.

4.2 Exposing the Cylinder

Steps to remove components to expose the cylinder.

4.3 Cylinder and Piston

Detailed procedure for removing the cylinder and piston assembly.

4.3.1 Removal

Detailed procedure for removing the cylinder and piston assembly.

4.3.2 Installation

Steps for installing the piston and cylinder assembly.

4.4 Piston Rings

Instructions on removing and installing piston rings.

4.5 Crankcase

Information related to the crankcase.

4.5.1 Removing the Crankshaft

Detailed steps for removing the crankshaft from the crankcase.

4.5.2 Installing the Crankshaft

Steps for installing the crankshaft into the crankcase.

4.6 Leakage Testing the Crankcase

Steps to prepare for crankcase leakage testing.

4.6.1 Preparations

Steps to prepare for crankcase leakage testing.

4.6.2 Pressure Test

Procedure for performing a pressure test on the crankcase.

4.6.3 Vacuum Test

Procedure for performing a vacuum test on the crankcase.

4.7 Replacing the Oil Seals

Instructions for replacing oil seals in the crankcase.

5. IGNITION SYSTEM

5.1 Repairing Component Parts

Overview of ignition system components and their repair.

5.1.1 Spark Plug

Information on spark plug checking, cleaning, and gap adjustment.

5.1.2 Ignition LeadSpark Plug Terminal

Procedures for removing and installing ignition leads and terminals.

5.1.3 Short Circuit WireGround Wire

Steps for replacing the short circuit and ground wires.

5.1.4 Stop Contact

Information on checking and servicing the stop contact system.

5.1.5 Flywheel

Procedures for removing and installing the flywheel.

5.1.6 Ignition Module

Information on ignition modules, their function, and replacement.

5.1.6.1 Ignition Timing

Details on ignition timing specifications and adjustability.

5.1.6.2 Removing and Installing

Steps for removing and installing the ignition module.

5.1.7 LED (066 only)

Instructions related to the LED for carburetor adjustment.

6. REWIND STARTER

6.1 Routine Maintenance

General maintenance tips for the rewind starter.

6.2 Rope RotorPawls

Procedures for removing and installing the rope rotor and pawls.

6.3 Replacing the Starter Rope

Step-by-step guide for replacing the starter rope.

6.4 Replacing the Rewind Spring

Instructions for replacing the rewind spring.

6.5 Tensioning the Rewind Spring

Steps for properly tensioning the rewind spring.

6.6 Replacing Starter Rope Guide Bush

Procedure for replacing the starter rope guide bush.

7. AV HANDLE SYSTEM

7.1 Repair

Instructions for removing and installing annular buffers and plugs.

8. MASTER CONTROL

8.1 Construction and Function

Explanation of the Master Control lever's construction and operation.

8.2 Throttle TriggerInterlock Lever

Steps for removing and installing the throttle trigger and interlock lever.

8.3 Switch Shaft

Procedures for removing and installing the switch shaft.

9. ELECTRIC HANDLE HEATING SYSTEM

9.1 Troubleshooting

Troubleshooting guide for the electric handle heating system.

9.1.1 Troubleshooting Chart

Diagnostic chart for faults in the heating system.

9.1.2 Test Connections and Test Values

Table of test connections and expected resistance values.

9.2 Switch

Steps for removing and installing the switch.

9.3 Heating Element in Rear Handle

Procedure for replacing the heating element in the rear handle.

9.4 Heating Element in Front Handle

Information on the front handle heating element and its replacement.

9.5 Generator

Instructions for removing and installing the generator.

10. CHAIN LUBRICATION

10.1 Pickup Body

Procedures for removing, cleaning, and installing the pickup body.

10.2 Suction Hose

Steps for removing and installing the suction hose.

10.3 Vent Valve

Procedure for removing and installing the vent valve.

10.4 Removal and Installation of Oil Pump

Detailed steps for removing and installing the oil pump.

10.5 Servicing the Oil Pump

Instructions for servicing and assembling the oil pump.

11. FUEL SYSTEM

11.1 Air Filter

Steps for removing, cleaning, and installing the air filter elements.

11.2 Construction and Operation of Carburetor with Compensator

Explanation of the carburetor's construction and how the compensator works.

11.3 Leakage Testing the Carburetor

Procedure for testing the carburetor for leaks.

11.4 Removal and Installation of Carburetor

Step-by-step guide for removing and installing the carburetor.

11.5 Servicing the Carburetor

Instructions for servicing carburetor components like diaphragms and strainers.

11.6 Carburetor Adjustment (Analog Ignition)

Guide for adjusting the carburetor settings for analog ignition systems.

11.7 Carburetor Adjustment (Digital Ignition)

Guide for adjusting carburetor settings for digital ignition systems.

11.8 Tank Vent

Instructions for checking and cleaning the tank vent.

11.9 Fuel Filter and Fuel Hose

Procedures for cleaning the fuel tank and replacing the pickup body and hose.

11.10 Tank Housing

Steps for removing and installing the tank housing and related components.

11.11 Carburetor Box

Procedures for removing and installing the carburetor box.

12. Special Servicing Tools and Aids

12.1 Special Servicing Tools

List of special tools and their part numbers and applications.

12.2 Servicing Aids

List of servicing aids like greases, threadlockers, and cleaners.