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Craftsman 143.991200 Specifications Page 3

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ii
TESTING PROCEDURE ................................................. 40
STARTING CIRCUIT ....................................................... 40
CHARGING CIRCUIT ...................................................... 40
350 MILLIAMP CHARGING SYSTEM ............................ 40
18 WATT A.C. LIGHTING ALTERNATOR....................... 41
35 WATT A.C. .................................................................. 41
2.5 AMP D.C., 35 WATT LIGHTING ............................... 41
3 AMP DC ALTERNATOR SYSTEM - DIODE IN
HARNESS SLEEVE ..................................................... 42
5 AMP D.C. ALTERNATOR SYSTEM
REGULATOR-RECTIFIER UNDER BLOWER
HOUSING ..................................................................... 43
3 AMP D.C. 5 AMP A.C. ALTERNATOR ......................... 43
MODELS OVM/OVXL/OHV12.5 ..................................... 44
MODELS OHV 13.5 - 17 (3/5 AMP SPLIT)..................... 44
MODELS OVM/OVXL/OHV12.5
(RED BETWEEN ENGINE AND DIODE) .................... 44
MODELS OHV 13.5 - 17
(RED BETWEEN ENGINE AND DIODE) .................... 45
7 AMP D.C. ALTERNATOR SYSTEM
REGULATOR-RECTIFIER UNDER ENGINE
HOUSING ..................................................................... 45
10 AMP A.C. ALTERNATOR ........................................... 46
16 AMP ALTERNATOR SYSTEM WITH EXTERNAL
REGULATOR ................................................................ 46
VOLTAGE REGULATORS .............................................. 46
FUEL SHUT-DOWN SOLENOIDS .................................. 46
LOW OIL SHUTDOWN SWITCHES ............................... 47
LOW OIL PRESSURE SENSOR .................................... 47
LOW OIL SENSOR.......................................................... 47
ELECTRIC STARTER SERVICE .................................... 48
12 VOLT OR 120 VOLT ELECTRIC STARTERS ........... 48
INSPECTION AND REPAIR ............................................ 49
BRUSH CARD REPLACEMENT..................................... 49
CHAPTER 7 FLYWHEEL BRAKE SYSTEMS ............... 50
GENERAL INFORMATION ............................................. 50
OPERATION .................................................................... 50
COMPONENTS ............................................................... 51
SERVICE ......................................................................... 51
BRAKE BRACKET ASSEMBLY ...................................... 52
IGNITION GROUNDOUT TERMINAL............................. 52
STARTER INTERLOCK SWITCH ................................... 52
CONTROL CABLE .......................................................... 52
BRAKE BRACKET REPLACEMENT .............................. 52
CHAPTER 8 IGNITION ................................................... 53
GENERAL INFORMATION ............................................. 53
OPERATION .................................................................... 53
SOLID STATE IGNITION SYSTEM (CDI) ....................... 53
COMPONENTS ............................................................... 53
TESTING PROCEDURE ................................................. 54
FOUR CYCLE IGNITION TROUBLESHOOTING........... 55
SERVICE ......................................................................... 56
SPARK PLUG SERVICE ................................................. 56
CONDITIONS CAUSING FREQUENT SPARK
PLUG FOULING ........................................................... 56
IGNITION TIMING CHECK ............................................. 57
SERVICE TIPS ................................................................ 57
Page
CHAPTER 9 INTERNAL ENGINE AND CYLINDER ..... 58
GENERAL INFORMATION ............................................. 58
OPERATION .................................................................... 58
4-CYCLE ENGINE THEORY .......................................... 58
LUBRICATION SYSTEMS .............................................. 59
COUNTERBALANCE SYSTEMS ................................... 59
COMPONENTS ............................................................... 60
ENGINE OPERATION PROBLEMS ............................... 61
ENGINE OPERATION PROBLEMS ............................... 62
TESTING ......................................................................... 63
ENGINE KNOCKS ........................................................... 63
ENGINE OVERHEATS .................................................... 63
SURGES OR RUNS UNEVENLY ................................... 63
ENGINE MISFIRES ......................................................... 63
ENGINE VIBRATES EXCESSIVELY .............................. 64
BREATHER PASSING OIL ............................................. 64
EXCESSIVE OIL CONSUMPTION ................................. 64
LACKS POWER .............................................................. 65
SERVICE ......................................................................... 65
DISASSEMBLY PROCEDURE ....................................... 65
CYLINDERS .................................................................... 68
CYLINDER HEAD AND VALVE TRAIN SERVICE ......... 69
VALVES, SPRINGS, AND PUSH RODS ........................ 69
PISTONS, RINGS, AND CONNECTING RODS ............. 70
PISTON ........................................................................... 70
PISTON RINGS ............................................................... 70
PISTON RING ORIENTATION ....................................... 70
CONNECTING RODS ..................................................... 71
CRANKSHAFTS AND CAMSHAFTS .............................. 71
CAMSHAFTS................................................................... 71
VALVE SEATS ................................................................. 72
VALVE LIFTERS .............................................................. 73
VALVE GUIDES ............................................................... 73
VALVE GUIDE REMOVAL (OVM, OHM, OHSK110
& 120, OVXL ONLY) .................................................... 73
VALVE GUIDE INSTALLATION (OVM, OHM,
OHSK110 & 120, OVXL ONLY) ................................... 73
CRANKCASE BREATHERS ........................................... 74
TOP MOUNTED BREATHER ......................................... 74
SIDE MOUNTED BREATHER ........................................ 74
CYLINDER COVER, OIL SEAL, AND BEARING
SERVICE ...................................................................... 75
CYLINDER COVER ........................................................ 75
OIL SEAL SERVICE ........................................................ 75
CRANKSHAFT BEARING SERVICE .............................. 75
BALL BEARING SERVICE.............................................. 75
SERVICE BUSHING ....................................................... 76
BUSHING SIZE CHART.................................................. 76
ENGINE ASSEMBLY ...................................................... 76
CHAPTER 10 .................................................................. 82
ENGINE SPECIFICATIONS AND SEARS
CRAFTSMAN CROSS-REFERENCE ......................... 82
OVERHEAD VALVE SEARS CRAFTSMAN
CROSS REFERENCE ................................................. 82
ENGINE SPECIFICATIONS............................................ 83
OVERHEAD VALVE TORQUE SPECIFICATIONS ........ 85
OVERHEAD VALVE TORQUE SPECIFICATIONS ........ 86
CHAPTER 11 EDUCATIONAL MATERIALS
AND TOOLS ............................................................... 87
Page
Copyright © 1994 by Tecumseh Products Company
All rights reserved. No part of this book may be reproduced or transmitted, in any form or by any
means, electronic or mechanical, including photocopying, recording or by any information storage
and retrieval system, without permission in writing from Tecumseh Products Company Training
Department Manager.
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