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Tecumseh AH520 - User Manual

Tecumseh AH520
68 pages
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This manual covers the following basic type or model
numbers dependent on age of product: AH520, AH600,
AV520, AV600, HSK600, TVS600.
This manual covered many engines under an Old form of
Identification which will need to be reviewed as well.
TYPE / SPECIFICATION NUMBER 638-670 1398-1642 and
Craftsman 200 Series Models.
2-CYCLE
ENGINES
T E C H N I C I A N ' S H A N D B O O K
TECUMSEH

Table of Contents

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Tecumseh AH520 Specifications

General IconGeneral
Fuel TypeGasoline
Compression Ratio8.0:1
CarburetorFloat Type
Governor TypeMechanical
Lubrication SystemSplash
Shaft OrientationHorizontal
RotationCounterclockwise (from PTO side)
Starting SystemRecoil
Max Power3600 RPM
Shaft Size25.4 mm (1 inch)
Engine Type4-stroke, air-cooled, single cylinder
Weight33 kg

Summary

General Information

Engine Identification and Model Interpretation

Describes methods for identifying engines and interpreting model numbers.

Engine Care and Preparation

Short Blocks, Fuel Mix, and Storage

Covers short block identification, fuel/oil mix, and storage.

Engine Maintenance Procedures

Tune-Up and Exhaust Port Cleaning

General steps for tune-up and exhaust port cleaning.

2-Cycle Engine Operation Theory

Piston Port and Reed Ported Operation

Describes piston port and reed ported operating principles.

Engine Terms Glossary

Lists common terms related to 2-cycle engines.

Air Cleaner Service

Air Cleaner Servicing Guidelines

Discusses servicing various air cleaner types.

Carburetor Fundamentals

Carburetor Identification and Types

How to identify carburetors and their basic types.

Carburetor Operation and Service

Engine Operation Stages and Carburetor Service

Describes engine stages and general carburetor service.

Carburetor Component Service

Choke, Fuel Bowl, and Float Service

Service for choke, fuel bowl, and float components.

Float Carburetor Adjustments

Inlet Needle, Seat, and Float Height Settings

Service and adjustments for inlet needle, seat, and float height.

Primer Bulb and Diaphragm Carburetor Service

Primer Bulb and Carburetor Body Cleaning

Installation of primer bulb and cleaning carburetor body.

Diaphragm and Inlet Needle Service

Diaphragm inspection and inlet needle service.

Fuel Inlet and Check Valve Service

Fuel Inlet Fitting and Primer Bulb Operation

Service for fuel inlet fitting and primer bulb operation.

Carburetor Check Valve

Diaphragm carburetor check valve service.

Detailed Carburetor Service Procedures

Throttle Shaft, Main Nozzle, and Float Bowl Service

Service for throttle shaft, main nozzle, and float bowl.

Specialized Carburetor Types

Emissionized and Outboard Carburetors

Service for emissionized and outboard carburetors.

Outboard Control Panel Installation

Outboard Control Panel Installation

Installing the control panel.

Carburetor Adjustments

Idle Speed and Mixture Adjustments

Adjusting idle speed and mixture for different carburetor types.

Carburetor Troubleshooting

Common Carburetor Malfunctions and Checks

Lists malfunctions and checks for float and diaphragm carburetors.

Standard Carburetor Service

Fuel Fitting, Choke Shaft, and Throttle Lever Service

Service for fuel fitting, choke shaft, and throttle lever.

Governors and Linkage

Air Vane Governors and Linkage Installation

Air vane governors and linkage installation.

Starters Overview

Rewind Starters: General Info, Operation, and Service

Covers rewind starter basics, operation, and service.

Rope Service

Rope replacement procedures.

Vertical Pull Starter Types

Horizontal Engagement Type Disassembly

Disassembly and assembly for horizontal engagement type.

Stylized Rewind Starter Service

Stylized Rewind Starter with Plastic Retainer

Disassembly and assembly for stylized rewind starters.

Vertical Pull Starter (Vertical Engagement)

Vertical Pull Starter, Vertical Engagement Type Disassembly

Disassembly and assembly for vertical engagement type.

Rewind Starters Mounted in Housing

Rewind Starter Mounted in Housing Disassembly

Disassembly of rewind starters mounted in housing.

Electric Starters

Electric Starter Components and Drive Assembly Service

Overview of electric starter components and drive assembly service.

Electric Starter Checks and Troubleshooting

Starter Checks, Brush, Field, and Armature Service

Checking starter components and servicing brushes, field, armature.

Troubleshooting Electric Starters

Troubleshooting electric starter issues.

Alternators and Electrical Systems

Alternator System Overview and Checks

Information on alternators and checking the system.

Flywheel Brake System

Inside-Edge Brake System Components and Service

Components and service procedures for the inside-edge brake system.

Inside-Edge Brake System Service Details

Brake Service, Ground Terminal, and Control Cable

Detailed brake service, ignition ground, and control cable.

Starter Interlock Switch Check

Checking the starter interlock switch.

Ignition System Fundamentals

Magneto Ignition Operation and Components

Operation and components of pre-1985 magneto ignition.

Solid State Ignition Systems

Solid State Ignition Overview and Operation

Introduction and operation of solid state ignition systems.

Ignition Service Procedures

Spark Plug and Flywheel Service

Spark plug and flywheel removal/service.

Flywheel Magnet Checks

Checking flywheel magnets.

Flywheel and Ignition Timing

Flywheel Keys, Torque, and Ignition Timing

Flywheel keys, torque, and ignition timing procedures.

Breaker Points and Ignition Coil Service

Breaker points and ignition coil service.

Specific Ignition System Types

Fixed Time, Solid State (CDI), and Other Ignition Systems

Details on fixed time, CDI, and other ignition systems.

Outboard Engine Timing (Standard Ignition)

Outboard Timing (Standard Ignition)

Timing procedures for standard ignition outboards.

Outboard Engine Timing (Solid State)

Outboard Timing (Solid State Ignition)

Timing procedures for solid state ignition outboards.

Cylinders and Internal Components

Piston and Ring Service

Service procedures for pistons and rings.

Connecting Rod and Needle Bearing Service

Connecting Rod and Needle Bearing Service

Service for connecting rods and needle bearings.

Crankshaft, Bearing, and Oil Seal Service

Crankshaft, Bearing, and Oil Seal Service

Service for crankshaft, bearings, and oil seals.

Oil Seal Service Details

Three Piece Seals and Outboard Seal Service

Service for three-piece seals and outboard seals.

Cylinders, Reeds, and Compression Release

Cylinder, Head, Gasket, and Reed Valve Service

Service for cylinder, head, gaskets, and reed valves.

Automatic Compression Release Operation

Operation of compression release mechanisms.

Cylinder Exhaust Ports

Cylinder Exhaust Ports Cleaning

Cleaning cylinder exhaust ports.

Engine Troubleshooting

2-Cycle Engine Troubleshooting Chart and Knocks

Troubleshooting chart and engine knocks.

Engine Performance Troubleshooting

Engine Misses, Lack of Power, and Overheating

Troubleshooting performance issues.

Engine Operation and Vibration Troubleshooting

Engine Surges, Uneven Running, and Vibration

Troubleshooting operational and vibration issues.

Specifications and References

Engine Type Number and Letter Reference

Reference for engine type and letter codes.

Sears Craftsman Cross Reference

Craftsman Model Cross Reference

Cross-reference for Craftsman models.

Table of Specifications

Engine Specifications Data

Technical data for various engine models.

Table of Torque Limits

Torque Specifications for Engine Components

Torque specifications for engine components.

Educational Materials and Tools

Tool Kit 670195 D

Tool Kit Components Illustration

Illustration of the tool kit.

Specialized Tools

Oil Seal Drivers and Indicators

Oil seal drivers and indicators.

Piston Ring Expander and Taper Gap Gauge

Piston ring expander and taper gap gauge.

Vibration Tachometer

Vibration tachometer.

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