Tecumseh HHM80 Technician's Handbook

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IDENTIFICATION OF TECUMSEH IGNITION SYSTEMS ...........................................................................64
COMPONENTS............................................................................................................................................64
IGNITION TROUBLESHOOTING ................................................................................................................66
TESTING PROCEDURE ..............................................................................................................................67
SERVICE .....................................................................................................................................................68
SPARK PLUG SERVICE..............................................................................................................................68
CONDITIONS CAUSING FREQUENT SPARK PLUG FOULING ................................................................68
IGNITION TIMING PROCEDURE ................................................................................................................ 68
SERVICE TIPS............................................................................................................................................. 71
CHAPTER 9 INTERNAL ENGINE AND CYLINDER ...................................................................................72
GENERAL INFORMATION ..........................................................................................................................72
OPERATION ................................................................................................................................................72
4-CYCLE ENGINE THEORY .......................................................................................................................72
LUBRICATION SYSTEMS ...........................................................................................................................73
COUNTERBALANCE SYSTEMS .................................................................................................................73
COMPONENTS............................................................................................................................................74
ENGINE OPERATION PROBLEMS............................................................................................................. 75
TESTING......................................................................................................................................................77
ENGINE KNOCKS .......................................................................................................................................77
ENGINE OVERHEATS ................................................................................................................................77
SURGES OR RUNS UNEVENLY ................................................................................................................ 77
ENGINE MISFIRES......................................................................................................................................77
ENGINE VIBRATES EXCESSIVELY ...........................................................................................................78
BREATHER PASSING OIL ..........................................................................................................................78
EXCESSIVE OIL CONSUMPTION ..............................................................................................................78
LACKS POWER ...........................................................................................................................................78
SERVICE .....................................................................................................................................................79
DISASSEMBLY PROCEDURE ....................................................................................................................79
CYLINDERS.................................................................................................................................................81
CYLINDER HEADS ......................................................................................................................................82
PISTONS, RINGS AND CONNECTING RODS ...........................................................................................82
CRANKSHAFTS AND CAMSHAFTS ...........................................................................................................84
VALVES .......................................................................................................................................................85
CRANKCASE BREATHERS ........................................................................................................................86
CYLINDER COVER, OIL SEAL, AND BEARING SERVICE ........................................................................87
CRANKSHAFT BEARING SERVICE ...........................................................................................................88
COUNTERBALANCE SERVICE ..................................................................................................................89
FLYWHEEL SERVICE .................................................................................................................................89
CHAPTER 10 ENGINE SPECIFICATIONS .................................................................................................90
FOUR CYCLE TORQUE SPECIFICATIONS ...............................................................................................91
ENGINE SPECIFICATIONS STANDARD POINT IGNITION .......................................................................93
SOLID STATE AND EXTERNAL IGNITION................................................................................................. 97
CHAPTER 11 EDUCATION MATERIALS AND TOOLS ...........................................................................102
DECIMAL / FRACTION CONVERSIONS...................................................................................................105
SEARS CRAFTSMAN CROSS REFERENCE SUPPLEMENT INCLUDED IN BACK OF BOOK

Tecumseh HHM80 Specifications

General

Brand	Tecumseh
Model	HHM80
Category	Engine
Language	English