TECUMSEH 2 CYCLE EngineS TECHNICIANS HandBOOK Manual

This manual covers a wide range of basic type or model numbers, including AH520, AH600, AV520, AV600, HSK600, TVS600, and more. It also includes engines under an old form of identification such as TYPE / SPECIFICATION NUMBER 638-670 1398-1642 and Craftsman 200 Series Models. The manual provides comprehensive information on engine identification, model interpretation, engine care, storage, tune-up procedures, exhaust port cleaning, cycle theory of operation, piston port style, reed ported style with loop scavenging, lubrication, air cleaners, carburetors, governors, linkage, and more. It consists of 68 pages in PDF format.

• PRIMER BULB (DIAPHRAGM CARBURETOR) 11
• CARBURETOR CHECK VALVE 11
• CARBURETOR SERVICE PROCEDURE 12
• EMISSIONIZED DIAPHRAGM CARBURETION 13
• OUTBOARD CARBURETORS 13
• OUTBOARD CONTROL PANEL 14
• CARBURETOR ADJUSTMENTS 15
• IDLE SPEED ADJUSTMENT 15
• FLOAT TYPE-FIXED MAIN, IDLE ADJUST 15
• DIAPHRAGM - SINGLE AND DUAL ADJUSTMENT 15
• TROUBLESHOOTING CARBURETION 16
• FLOAT CARBURETOR CHECKS 16
• CHECKS FOR DIAPHRAGM 16
• STANDARD SERVICE CARBURETORS 17
• FUEL FITTING 17
• INLET FUEL FITTING 17
• CHOKE SHAFT 17
• THROTTLE LEVER 17
• IDLE SPEED ADJUSTMENT SCREW 17
• GOVERNORS AND LINKAGE 18
• AIR VANE GOVERNORS 18
• OPERATION 18
• LINKAGE INSTALLATION 18
• REWIND STARTERS, ELECTRIC STARTERS AND ALTERNATORS 20
• REWIND STARTERS 20
• COMPONENTS 20
• ROPE SERVICE 20
• STYLIZED REWIND STARTER 21
• VERTICAL PULL STARTER HORIZONTAL ENGAGEMENT TYPE 22
• STYLIZED REWIND STARTER WITH PLASTIC RETAINER 23
• VERTICAL PULL STARTER, VERTICAL ENGAGEMENT TYPE 24
• REWIND STARTER MOUNTED IN HOUSING 25
• ELECTRIC STARTERS 26
• DRIVE ASSEMBLY SERVICE 26
• STARTER CHECKING AND SERVICE 27
• CHECK FIELD 27
• ARMATURE CHECK 27
• TROUBLESHOOTING STARTERS 27
• ALTERNATORS 28
• CHECKING THE SYSTEM 28
• FLYWHEEL (INSIDE-EDGE) BRAKE SYSTEM 29
• INSIDE EDGE SYSTEM 29
• COMPONENTS 29
• SERVICE 29
• CONTROL CABLE 30
• GENERAL INFORMATION 1
• ENGINE IDENTIFICATION 1
• INTERPRETATION OF MODEL NUMBER 1
• ENGINE CARE 2
• SHORT BLOCKS 2
• STORAGE: 2
• TUNE-UP PROCEDURE 3
• EXHAUST PORT CLEANING 3
• 2-CYCLE THEORY OF OPERATION 4
• OPERATION OF PISTON PORT STYLE 4
• OPERATION OF REED PORTED STYLE WITH LOOP SCAVENGING 4
• TERMS 4
• EXHAUST OR SCAVENGE PHASE 4
• PORTS 4
• EXHAUST PORTS 4
• THIRD PORT 4
• REED VALVE 4
• LUBRICATION 4
• AIR CLEANERS, CARBURETORS, GOVERNORS AND LINKAGE 5
• AIR CLEANERS 5
• POLYURETHANE-TYPE AIR CLEANER 5
• KLEEN-AIRE® SYSTEM 5
• PAPER-TYPE AIR CLEANER SERVICE 5
• GENERAL CARBURETOR INFORMATION 6
• CARBURETOR IDENTIFICATION 6
• FLOAT-TYPE CARBURETORS 6
• DIAPHRAGM (PRESSURE DIFFERENTIAL) CARBURETORS 6
• OPERATION 7
• CARBURETOR SERVICE 7
• THROTTLE 7
• CHOKE 8
• ADJUSTING SCREWS 8
• FUEL BOWL RETAINING NUT 8
• CARBURETOR VENTING 8
• HIGH TILT FLOAT STYLE 8
• FUEL BOWL 8
• FLOAT 8
• INLET NEEDLE AND SEAT (FLOAT CARBURETORS) 9
• NEEDLE AND SEAT OPO-OFF TEST 9
• FLOAT HEIGHT SETTINGS 9
• PRIMER BULB 10
• CLEANING CARBURETOR BODY 10
• DIAPHRAGMS 10
• INLET NEEDLE AND SEAT 11
• FUEL INLET FITTING 11
• IGNITION 31
• IGNITION OPERATION (Pre- 1985 Production) 31
• MAGNETO IGNITION 31
• CONTACT POINTS 31
• CONDENSER 31
• OPERATION OF THE TECUMSEH MAGNETO IGNITION 31
• SOLID STATE IGNITION (1985 to Present 32
• SOLID STATE IGNITION OPERATION 32
• IGNITION SERVICE 33
• SPARK PLUG SERVICE 33
• FLYWHEEL REMOVAL AND SERVICE 33
• FLYWHEEL MAGNETS 33
• FLYWHEEL KEYS 34
• ADAPTER KEY TO FLYWHEEL ASSEMBLY 34
• FLYWHEEL SLEEVE 34
• FLYWHEEL TORQUE 34
• REPLACING MAGNETO BREAKER POINTS 34
• CONDENSER CHECK
• IGNITION COIL 34
• IGNITION TIMING 34
• FIXED TIME SPEED (EXTERNAL COIL) 36
• SOLID STATE (CDI) 36
• OTHER IGNITION SYSTEMS 36
• OUTBOARD TIMING 38
• OUTBOARD TIMING (STANDARD IGNITION) 38
• OUTBOARD TIMING (SOLID STATE) 39
• CYLINDERS & INTERNAL COMPONENTS 41
• PISTON & RING SERVICE 41
• CONNECTING ROD SERVICE 42
• NEEDLE BEARINGS 42
• CRANKSHAFT, BEARING AND OIL SEAL SERVICE 43
• NEEDLE BEARINGS
• OIL SEALS 43
• ONE PIECE SEALS 43
• THREE PIECE SEALS 44
• OUTBOARD SEAL SERVICE 44
• CYLINDERS, REEDS & COMPRESSION RELEASE 45
• CYLINDER & HEAD SERVICE 45
• GASKETS 45
• REED VALVES 45
• AUTOMATIC COMPRESSION RELEASE (DOUBLE REED TYPE) 45
• AUTOMATIC COMPRESSION RELEASE (SINGLE REED TYPE 45
• CYLINDER EXHAUST PORTS 46
• TROUBLESHOOTING 47
• ENGINE FAILS TO START OR STARTS WITH DIFFICULTY 47
• ENGINE KNOCKS 47
• ENGINE MISSES UNDER LOAD 48
• ENGINE LACKS POWER 48
• ENGINE OVERHEATS 48
• ENGINE SURGES OR RUNS UNEVENLY 49
• ENGINE VIBRATES EXCESSIVELY 49
• SPECIFICATIONS 50
• ENGINE TYPE NUMBER AND LETTER REFERENCE 50
• SEARS CRAFTSMAN CROSS REFERENCE 51
• TABLE OF SPECIFICATIONS 52 - 61
• TABLE OF TORQUE LIMITS 62
• EDUCATIONAL MATERIALS AND TOOLS 63
• AVAILABLE TECHNICIAN'S HANDBOOKS 63
• AVAILABLE FOREIGN TECHNICIAN'S HANDBOOKS 63
• TOOL KIT 670195D 64
• TOOLS 65

This manual provides all the necessary information for professional mechanics and DIY enthusiasts, and it is available in PDF format.