MTD 78 Series Manuals

MTD 78 Series Manuals

Manuals and User Guides for MTD 78 Series. We have 1 MTD 78 Series manual available for free PDF download: Shop Manual

MTD 78 Series Shop Manual

MTD 78 Series Shop Manual (136 pages)

277/357/420cc horizontal Shaft Engines

Brand: MTD | Category: Engine | Size: 5.28 MB

Table of Contents

Table of Contents
3
Chapter 1: Introduction

7
- Professional Service Manual Intent
  7
- Safety
  7
- Fasteners
  9
- Assembly Instructions
  9
- Model and Serial Number
  10
- Maintenance
  11
- Air Filter (Summer Engines)
  12
- Oil Type and Capacity
  13
- Changing the Oil
  14
- Fuel
  15
- Fuel Filters
  15
- Valve Lash
  17
- Cleaning the Engine
  19
- General Torque Specifications
  20
- Maintenance Chart
  20
- Frequently Used Specifications
  21
Chapter 2: Basic Troubleshooting

23
- Definitions
  23
- Introduction
  23
- Steps to Troubleshooting
  23
- Define the Problem
  23
- Identify Factors that Could Cause the Problem
  24
- Repairing the Problem
  29
- Prime Test
  30
- Leak-Down Test
  30
- Compression Test
  32
- PCV Testing
  33
Chapter 3: Air Intake Systems

35
Chapter 4: The Fuel System and Governor

43
- Inspecting the Fuel
  43
- Test Fuel for Alcohol
  44
- Fuel Tank Vent
  45
- The Fuel Filter
  46
- Inspect the Fuel Lines
  46
- The Fuel Tank
  47
- Evaporative (EVAP) Emissions System
  48
- Troubleshooting the EVAP System
  50
- Charcoal Canister
  52
- Roll over Valve
  53
- Choke
  54
- Primers (Snow Engines)
  56
- Carburetors
  57
- Inspecting the Carburetor
  57
- Disassembly and Rebuilding of the Carburetor
  58
- Fuel Shut-Off Valve
  62
- Governor
  64
- Governor Arm
  64
- Governor Shaft
  65
- Governor Cup and the Governor Gear
  66
- Governor Adjustment
  67
Chapter 5: Lubrication

69
- Oil Type and Quantity
  69
- Oil Dip Stick
  70
- Dip Stick Tube Removal
  71
- Lubrication System
  72
- Positive Crankcase Ventilation Valve
  73
Chapter 6: Starter and Charging Systems

75
- Recoil Starter Removal
  75
- Starter Cup
  76
- Starter Rope
  77
- Starter Pulley and Recoil Spring
  79
- Electric Starter
  81
- Charging System
  83
- Charging System Testing
  84
- Stator
  85
- Rotor
  85
Chapter 7: Ignition System

87
- Troubleshooting the Ignition System
  87
- Stop Switch
  88
- Remote (Ignition) Stop Switch (Snow Engines)
  89
- Test for Ignition that Won't Turn off
  90
- The Module
  91
- Module Removal
  92
- Installing the Module and Setting the Air Gap
  93
- Flywheel
  94
- About the Spark Plug
  95
- Cleaning the Spark Plug
  95
- Inspection of the Spark Plug
  95
- Spark Plug Removal
  95
Chapter 8: Exhaust

97
Chapter 9: Cylinder Head

103
- Cylinder Head Removal
  103
- Cylinder Head Installation
  106
- Valves
  107
Chapter 10: Crankshaft, Piston and Connecting Rod

111
- Crankshaft Inspection
  114
- Piston Inspection
  115
- Connecting Rod Inspection
  117
- Cylinder Inspection
  117
- Balance Shaft (483 & 490)
  118
- Reassembly
  119
- Engine Specifications Chart
  121
- Engine Torque Values Chart
  125
Chapter 11: Failure Analysis

127
- Abrasive Ingestion
  127
- Insufficient Lubrication
  130
- Engine Overspeed
  131
- Overheated
  132
- Mechanical Breakage/ Wear
  133
- Detonation/Preignition
  133

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