EasyManua.ls Logo

Tecumseh HM70 User Manual

Tecumseh HM70
124 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Page #1 background imageLoading...
Page #1 background image
This manual covers engine models:
ECV100 - 120, H22 - 80, HH40 - 70, HHM80, HM70 - 100,
HMSK70 - 110, HMXL70, HS40 - 50, HSK30 - 70, HSSK40 - 50,
HT30 - 35, HXL35, LAV30 - 50, LEV80 - 120, TNT100 - 120,
TVM125 - 220, TVXL170 - 220, TVS75 - 120, TVXL105 - 115,
V40 - 80, VH40 - 70, V60 - 70, VM70 - 100
Model numbers are located on the engine shroud.
3 TO 11 HP
4-CYCLE
L-HEAD
ENGINES
T E C H N I C I A N ' S H A N D B O O K
TECUMSEH

Table of Contents

Question and Answer IconNeed help?

Do you have a question about the Tecumseh HM70 and is the answer not in the manual?

Tecumseh HM70 Specifications

General IconGeneral
Fuel TypeGasoline
Power Output7 hp (5.2 kW) @ 3600 rpm
Ignition SystemMagneto
Starting SystemRecoil starter
Engine Type4-stroke, air-cooled, single cylinder

Summary

Chapter 1 General Information

Engine Identification and Model Number Interpretation

Details on identifying engine models, serial numbers, and interpreting model number designations.

Engine Components and Fluids

Information on short blocks, fuel recommendations, and engine oil types and capacities.

Maintenance Procedures

Guidance on engine tune-up procedures, proper storage, and oil change intervals.

Chapter 2 Air Cleaners

Air Cleaner Overview

Explains the function, operation, and components of air cleaning systems for engines.

Air Cleaner Troubleshooting and Service

Covers troubleshooting common air cleaner issues and service procedures for filter elements.

Filter Element Types

Details on servicing polyurethane-type and paper-type air filter elements.

Chapter 3 Carburetors and Fuel Systems

Carburetor and Fuel System Overview

Introduces float and diaphragm carburetors, their operation, and fuel system components.

Carburetor Types and Identification

Describes various carburetor series (1, 3, 4, 6, 8, 9, 10) and identification methods.

Carburetor Service and Adjustments

Covers testing, pre-sets, final adjustments, and disassembly procedures for carburetors.

Chapter 4 Governors and Linkage

Governor System Overview

Explains governor function, operation, internal components, and troubleshooting basics.

Governor Adjustment and Service

Details on engine overspeeding, surging, governor adjustment, and gear/shaft service.

Speed Controls and Linkage

Covers different types of speed controls, linkage adjustments, and RPM settings.

Chapter 5 Rewind Starters

Rewind Starter Overview and Components

Information on rewind starter general information, operation, and components.

Rewind Starter Service and Repair

Covers rope service, retainer replacement, and disassembly/assembly procedures.

Chapter 6 Electrical Systems

Electrical System Overview

Details on battery, starting circuit, charging circuit, and basic electrical system operation.

Starting Circuit and Electric Starters

Explains the operation and service procedures for electric starting circuits and starters.

Charging Circuit Systems

Covers charging systems, AC to DC conversion, rectifiers, and specific alternator system checks.

Electrical Components and Checks

Information on batteries, wiring, electrical terms, and basic system checks.

Voltage Regulators and Shutdowns

Details on voltage regulator function and low oil shutdown switch operation.

Chapter 7 Flywheel Brake Systems

Flywheel Brake System Overview

Explains flywheel brake systems, their operation, and components for safety compliance.

Flywheel Brake Service and Troubleshooting

Covers service procedures for flywheel removal, brake components, and related switches.

Chapter 8 Ignition

Ignition System Overview

Introduces solid state (CDI) and magneto ignition systems, their general information, and operation.

Ignition System Identification and Components

Details on identifying ignition systems and lists components for magneto ignition systems.

Ignition Testing and Service

Covers testing procedures, spark plug service, and ignition timing for various systems.

Chapter 9 Internal Engine and Cylinder

Engine Theory and Systems Overview

Explains 4-cycle engine theory, lubrication, and counterbalance systems.

Engine Components

Details major internal engine components like cylinder block, crankshaft, valves, and flywheel.

Engine Operation Problems

Lists common engine operation issues including knocks, overheating, misfires, and power loss.

Engine Service Procedures

Covers engine disassembly procedures and general testing for various operational problems.

Cylinder and Head Service

Procedures for checking, measuring, and re-sizing cylinders and servicing cylinder heads.

Piston, Rings, and Connecting Rod Service

Details on checking piston, rings, and connecting rod assembly for wear and proper installation.

Crankshafts and Camshafts Service

Guidelines for inspecting crankshafts and camshafts for wear and proper timing alignment.

Valves and Valve Seats Service

Procedures for valve clearance, seating, grinding, and valve seat reconditioning.

Cylinder Cover, Oil Seal, and Bearing Service

Covers service for cylinder covers, oil seals, and crankshaft bearing maintenance.

Counterbalance and Flywheel Service

Details on the counterbalance system alignment and flywheel service procedures.

Chapter 10 Engine Specifications

Four Cycle Torque Specifications

Provides torque specifications for various engine components across different engine models.

Chapter 11 Educational Materials and Tools

Technical Manuals and Videos

Lists available technician handbooks, foreign language manuals, and video training programs.

Special Booklets and Guides

Details special booklets for failure analysis, carburetor, ignition, and quick reference guides.

Service Tools

Lists specialized tools for engine service, including drivers, pullers, and gauges.

Sears Craftsman Cross Reference Charts