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Tecumseh V-Twins TECUMSEH V-TWIN ENGINE TABLE OF CONTENTS CHAPTER 1. GENERAL INFORMATION CHAPTER 2. AIR CLEANERS CHAPTER 3. CARBURETORS AND FUEL SYSTEMS CHAPTER 4. GOVERNORS AND LINKAGE CHAPTER 5. ELECTRICAL SYSTEMS CHAPTER 6. IGNITION CHAPTER 7. INTERNAL ENGINE AND DISASSEMBLY CHAPTER 8. ENGINE ASSEMBLY CHAPTER 9. TROUBLESHOOTING AND TESTING CHAPTER 10. ENGINE SPECIFICATIONS Copyright © 2000 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. i TABLE OF CONTENTS (by subject) GENERAL INFORMATION Page Engine Identification ................................................................................................ 1-1 Interpretation of Engine Identification ...................................................................... 1-1 Short Blocks ............................................................................................................ 1-2 Fuels ........................................................................................................................ 1-2 Engine Oil ................................................................................................................ 1-3 Basic Tune-Up Procedure ....................................................................................... 1-4 Storage .................................................................................................................... 1-4 AIR CLEANERS General Information ................................................................................................. 2-1 Operation ................................................................................................................. 2-1 Components ............................................................................................................ 2-1 Troubleshooting and Testing.................................................................................... 2-1 Service..................................................................................................................... 2-2 CARBURETORS AND FUEL SYSTEMS General Information ................................................................................................. 3-1 Float Style Carburetors............................................................................................ 3-1 Operational Circuits Series 7 Carburetor................................................................. 3-1 Testing ..................................................................................................................... 3-3 Carburetor Disassembly Procedure ........................................................................ 3-5 Inspection ................................................................................................................ 3-7 Carburetor Re-Assembly ......................................................................................... 3-7 Throttle Shaft and Plate ................................................................................... 3-7 Choke Shaft and Plate..................................................................................... 3-8 Fuel Bowl Assembly ........................................................................................ 3-8 Impulse Fuel Pumps ................................................................................................ 3-9 Impulse Fuel Pump Service........................................................................... 3-10 GOVERNORS AND LINKAGE General Information ................................................................................................. 4-1 Operation ................................................................................................................. 4-1 Troubleshooting ....................................................................................................... 4-1 Engine Speed Adjustments ..................................................................................... 4-1 Engine Overspeed ........................................................................................... 4-2 Engine Surging ................................................................................................ 4-2 Governor Service Static Adjustment - Governor .......................................................................... 4-2 Governor Gear and Shaft Service ................................................................... 4-3 Governor Shaft Replacement .......................................................................... 4-3 ii TABLE OF CONTENTS (continued) Page Speed Controls and Linkage ................................................................................... 4-3 Synchronizing the Carburetors ................................................................................ 4-4 Choke Synchronization ............................................................................................ 4-5 ELECTRICAL SYSTEMS General Information ................................................................................................. 5-1 Operation ................................................................................................................. 5-1 Converting Alternating Current to Direct Current ..................................................... 5-2 Components Battery ............................................................................................................ 5-2 Wiring.............................................................................................................. 5-2 Condition......................................................................................................... 5-2 Wire Gauge ..................................................................................................... 5-2 Electrical Terms ....................................................................................................... 5-3 Basic Checks ........................................................................................................... 5-3 Charging Circuit ....................................................................................................... 5-4 3 Amp D.C. 5 Amp A.C. Alternator ......................................................................... 5-4 Diode Replacement ........................................................................................ 5-4 Checking the System ...................................................................................... 5-5 16 Amp Alternator System with External Regulator................................................. 5-5 Troubleshooting Electrical Charging Circuit Flow Chart .......................................... 5-6 Voltage Regulators .................................................................................................. 5-7 Fuel Shut-Down Solenoids ...................................................................................... 5-7 Low Oil Pressure Sensor Testing............................................................................. 5-7 Starting Circuit ......................................................................................................... 5-8 Testing Procedure Starting Circuit .................................................................. 5-8 Troubleshooting Electrical Starter Circuit Flow Chart ..................................... 5-9 Electric Starter Service .......................................................................................... 5-10 12 Volt Electric Starter .................................................................................. 5-10 Inspection and Repair ................................................................................... 5-11 Brush Holder ................................................................................................. 5-12 Brush Replacement ...................................................................................... 5-12 IGNITION General Information ................................................................................................. 6-1 Operation Solid State Ignition System (CDI) ............................................................................ 6-1 Components .................................................................................................... 6-1 Testing Procedure............................................................................................ 6-2 Service Spark Plug Service .......................................................................................... 6-3 Conditions Causing Frequent Spark Plug Fouling ........................................... 6-3 Ignition Timing ......................................................................................................... 6-3 Service Tips ............................................................................................................. 6-4 iii TABLE OF CONTENTS (continued) Page INTERNAL ENGINE AND DISASSEMBLY General Information ................................................................................................. 7-1 Lubrication Systems ................................................................................................ 7-1 Disassembly Procedure ........................................................................................... 7-1 Disassembly of Cylinder
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