3to 11hp 4-cycle l-head engines - Small Engine Suppliers

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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 iii
CHAPTER 1 GENERAL INFORMATION ENGINE IDENTIFICATION Tecumseh engine model, specification, and serial numbers or (date of manufacture, DOM) are stamped into the blower housing or located on a decal on the engine in locations as illustrated (diag. 1 & 2). COVER BEZEL NOTE: On some LEV engines, a cover bezel must be removed to provide access to the identification decal (diag. 1). The engine identification decal also provides the applicable warranty code and oil recommendations (diag. 3). Emissionized engines that meet the California Air Resource Board (C.A.R.B.) or the Environmental Protection Agency (E.P.A.) standards will include additional required engine information on the engine decal (diag. 3). MODEL AND D.O.M. NUMBER DECAL LOCATED UNDER COVER (IF SO EQUIPPED) PRESS IN AND LIFT HERE TO RELEASE COVER ˙ INTERPRETATION OF MODEL NUMBER 1 The first letter designation in a model number indicates basic type of engine. V LAV VM - Vertical Shaft - Lightweight Aluminum Vertical - Vertical Medium Frame TVM - Tecumseh Vertical (Medium Frame) VH TVS TNT ECV - Vertical Heavy Duty (Cast Iron) - Tecumseh Vertical Styled - Toro N’ Tecumseh - Exclusive Craftsman Vertical TVXL - Tecumseh Vertical Extra Life LEV H HS HM - Low Emissions Vertical - Horizontal Shaft - Horizontal Small Frame - Horizontal Medium Frame HHM - Horizontal Heavy Duty (Cast Iron) Medium Frame HH - Horizontal Heavy Duty (Cast Iron) ECH - Exclusive Craftsman Horizontal HSK - Horizontal Snow King HS50 67355H SER 4091D 2 1
Page 1 and 2: TECUMSEH T E C H N I C I A N ' S H
Page 3: GOVERNOR GEAR AND SHAFT SERVICE....
Page 7 and 8: ENGINE OIL Use a clean, high qualit
Page 9 and 10: GENERAL INFORMATION CHAPTER 2 AIR C
Page 11 and 12: CHAPTER 3 CARBURETORS AND FUEL SYST
Page 13 and 14: IMPULSE FUEL PUMPS Impulse fuel pum
Page 15 and 16: CARBURETOR IDENTIFICATION Tecumseh
Page 17 and 18: ENGINE TROUBLESHOOTING Engine Will
Page 19 and 20: TESTING 1. After repeated efforts t
Page 21 and 22: DISASSEMBLY PROCEDURE NOTE: Engines
Page 23 and 24: Diaphragm Carburetors 1. Remove the
Page 25 and 26: ASSEMBLY Welch Plugs To install a n
Page 27 and 28: 4. Install the hinge pin from the o
Page 29 and 30: Throttle Lever Remove the throttle
Page 31 and 32: ENGINE OVERSPEEDING 1. If the engin
Page 33 and 34: SPEED CONTROLS AND LINKAGE Many dif
Page 35 and 36: HORIZONTAL SHAFT ENGINES IDLE SPEED
Page 37 and 38: VERTICAL SHAFT ENGINES HIGH SPEED A
Page 39 and 40: GENERAL INFORMATION CHAPTER 5 REWIN
Page 41 and 42: CAUTION: THIS REWIND SPRING IS NOT
Page 43 and 44: 2. Place the pulley assembly into t
Page 45 and 46: at the outer edge against the gear
Page 47 and 48: CONVERTING ALTERNATING CURRENT TO D
Page 49 and 50: BASIC CHECKS Before going into exte
Page 51 and 52: TROUBLESHOOTING ELECTRICAL CHARGING
Page 53 and 54: 18 Watt A.C. Lighting Alternator Mo
Page 55 and 56:
NOTE: ON OLDER POINT IGNITION SYSTE
Page 57 and 58:
5 Amp Alternator System Regulator-R
Page 59 and 60:
7 Amp Alternator System Regulator-
Page 61 and 62:
SERVICE This section covers the ser
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CHAPTER 7 FLYWHEEL BRAKE SYSTEMS GE
Page 65 and 66:
SERVICE If the brake system fails t
Page 67 and 68:
CHAPTER 8 IGNITION GENERAL INFORMAT
Page 69 and 70:
The condenser acts as an electrical
Page 71 and 72:
TESTING PROCEDURE 1. Check for spar
Page 73 and 74:
Begin the procedure by replacing th
Page 75 and 76:
Other Solid State Systems The follo
Page 77 and 78:
LUBRICATION SYSTEMS The lubrication
Page 79 and 80:
ENGINE OPERATION PROBLEMS ENGINE KN
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TESTING ENGINE KNOCKS 1. Check the
Page 83 and 84:
5. Check the engine valve lash. Res
Page 85 and 86:
CYLINDERS Visually check the cylind
Page 87 and 88:
Use a ring expander to remove and r
Page 89 and 90:
VALVES The valves should be checked
Page 91 and 92:
Late production top mounted breathe
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COUNTERBALANCE SERVICE To correctly
Page 95 and 96:
FOUR CYCLE TORQUE SPECIFICATIONS Th
Page 97 and 98:
ENGINE SPECIFICATIONS STANDARD POIN
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ENGINE SPECIFICATIONS STANDARD POIN
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SOLID STATE AND EXTERNAL IGNITION A
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SOLID STATE AND EXTERNAL IGNITION A
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SOLID STATE AND EXTERNAL IGNITION (
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OIL SEAL DRIVER FLYWHEEL KNOCK-OFF
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DECIMAL/FRACTION CONVERSIONS .016 =
Page 111 and 112:
SEARS CRAFTSMAN CROSS REFERENCE CHA
Page 113 and 114:
Page 115 and 116:
Page 117 and 118:
Page 119 and 120:
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3to 11hp 4-cycle l-head engines - Small Engine Suppliers

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