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MTD 78 Series User Manual

MTD 78 Series
136 pages
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Professional Shop Manual
78/83/90 Series Horizontal Shaft Engines
(277/357/420 cc Engines)
NOTE: These materials are for use by trained technicians who are experienced in the service and repair of outdoor power
equipment of the kind described in this publication, and are not intended for use by untrained or inexperienced individuals.
These materials are intended to provide supplemental information to assist the trained technician. Untrained or inexperi-
enced individuals should seek the assistance of an experienced and trained professional. Read, understand, and follow all
instructions and use common sense when working on power equipment. This includes the contents of the product’s Oper-
ators Manual, supplied with the equipment. No liability can be accepted for any inaccuracies or omission in this publication,
although care has been taken to make it as complete and accurate as possible at the time of publication. However, due to
the variety of outdoor power equipment and continuing product changes that occur over time, updates will be made to these
instructions from time to time. Therefore, it may be necessary to obtain the latest materials before servicing or repairing a
product. The company reserves the right to make changes at any time to this publication without prior notice and without
incurring an obligation to make such changes to previously published versions. Instructions, photographs and illustrations
used in this publication are for reference use only and may not depict actual model and component parts.
© Copyright 2010 MTD Products Inc. All Rights Reserved

Table of Contents

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MTD 78 Series Specifications

General IconGeneral
BrandMTD
Model78 Series
CategoryEngine
LanguageEnglish

Summary

Chapter 1: Introduction

Safety Precautions

Essential safety guidelines and precautions for operating and servicing engines.

Chapter 2: Basic Troubleshooting

Troubleshooting Methodology

Outlines a systematic approach to diagnosing and resolving engine issues.

Problem Identification and Causes

Covers defining the issue and identifying potential causes for engine malfunctions.

Diagnostic Tests and Procedures

Details specific tests like prime, leak-down, compression, and PCV to pinpoint problems.

Chapter 3: Air Intake Systems

Chapter 4: Fuel System and Governor

Chapter 6: Starter and Charging Systems

Charging System Testing

Provides procedures for testing the charging system's voltage output.

Chapter 7: Ignition System

Ignition System Troubleshooting

Steps for diagnosing ignition system faults and ensuring proper spark.

Chapter 9: Cylinder Head

Valve Train Service

Procedures for inspecting, servicing, and testing engine valves.

Chapter 10: Crankshaft, Piston, and Connecting Rod

Internal Component Inspection and Service

Covers inspection and service of crankshaft, piston, rod, cylinder, and balance shaft.

Chapter 11: Failure Analysis

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