John Deere Yanmar 3TG66, 3TG72 Gasoline Engines Technical Service Repair Manual CTM12 PDF - Complete Guide

Complete Yanmar 3TG66, 3TG72 Gasoline Engines Technical Service Repair Manual CTM12 PDF

The John Deere Yanmar 3TG66 and 3TG72 Gasoline Engines Technical Service Repair Manual CTM12 PDF offers a comprehensive and detailed guide for maintenance and repair. Designed for professionals, this manual provides step-by-step instructions, technical specifications, and troubleshooting tips to ensure optimal engine performance and longevity. Ideal for technicians and service experts, it covers all essential aspects of these gasoline engines, facilitating accurate diagnostics and efficient repairs.

Applicable Models:
Yanmar 3TG66, 3TG72 Gasoline Engines
Manual Number: CTM12 

Detailed Contents:

Group 05— . . . . . . . . . . . . . . . . . . . . . . . . . .
About This Manual . . . . . . . . . . . . . . . . . . . 05-2
Engine Serial Number Plate . . . . . . . . . . . . . 05-3
Engine Application Chart . . . . . . . . . . . . . . . 05-3
Engine Torque Specifications . . . . . . . . . . . . 05-4
Metric Torque Specifications . . . . . . . . . . . . 05-5
Group 06—Repair Specifications
Engine
3TG72 . . . . . . . . . . . . . . . . . . . . . . . . . 06-1
3TG66 . . . . . . . . . . . . . . . . . . . . . . . . . 06-6
Group 10—Valve Train and Camshaft
Service Equipment and Tools . . . . . . . . . . . . 10-1
Other Materials . . . . . . . . . . . . . . . . . . . . . 10-1
Service Part Kits . . . . . . . . . . . . . . . . . . . . 10-2
Rocker Arm
Remove and Disassemble Cover . . . . . . . . 10-2
Measure and Adjust Valve Clearance . . . . . 10-3
Remove and Disassemble Assembly . . . . . 10-4
Remove and Inspect Pushrods and
Cam Followers . . . . . . . . . . . . . . . . . . 10-7
Install Pushrods and Cam Followers . . . . . . 10-9
Assemble and Install Assembly . . . . . . . . 10-10
Assemble and Install Cover . . . . . . . . . . 10-11
Camshaft
Remove . . . . . . . . . . . . . . . . . . . . . . . 10-12
Disassemble and Inspect . . . . . . . . . . . . 10-14
Assemble . . . . . . . . . . . . . . . . . . . . . . 10-18
Install . . . . . . . . . . . . . . . . . . . . . . . . . 10-18
Group 15—Cylinder Head, Valves, and Manifolds
Essential Tools . . . . . . . . . . . . . . . . . . . . . 15-1
Service Equipment and Tools . . . . . . . . . . . . 15-1
Service Part Kits . . . . . . . . . . . . . . . . . . . . 15-1
Exhaust Manifold
Remove, Repair, and Install . . . . . . . . . . . 15-2
Intake Manifold
Remove, Repair, and Install . . . . . . . . . . . 15-3

Cylinder
Remove . . . . . . . . . . . . . . . . . . . . . . . . 15-4
Disassemble . . . . . . . . . . . . . . . . . . . . . 15-5
Assemble . . . . . . . . . . . . . . . . . . . . . . 15-10
Install . . . . . . . . . . . . . . . . . . . . . . . . . 15-13
Group 20—Flywheel
Service Equipment and Tools . . . . . . . . . . . . 20-1
Flywheel Housing and Flywheel
Remove . . . . . . . . . . . . . . . . . . . . . . . . 20-1
Inspect . . . . . . . . . . . . . . . . . . . . . . . . . 20-3
Install . . . . . . . . . . . . . . . . . . . . . . . . . . 20-3
Group 25—Connecting Rods and Pistons
Service Equipment and Tools . . . . . . . . . . . . 25-1
Other Materials . . . . . . . . . . . . . . . . . . . . . 25-1
Service Part Kits . . . . . . . . . . . . . . . . . . . . 25-1
Connecting Rod
Measure Side Play . . . . . . . . . . . . . . . . . 25-2
Measure Bearing Clearance . . . . . . . . . . . 25-2
Pistons and Connecting Rods
Remove . . . . . . . . . . . . . . . . . . . . . . . . 25-4
Inspect . . . . . . . . . . . . . . . . . . . . . . . . . 25-6
Deglaze Cylinder Bores . . . . . . . . . . . . . 25-13
Assemble . . . . . . . . . . . . . . . . . . . . . . 25-14
Install . . . . . . . . . . . . . . . . . . . . . . . . . 25-16
Group 30—Crankshaft and Main Bearings
Service Equipment and Tools . . . . . . . . . . . . 30-1
Service Part Kits . . . . . . . . . . . . . . . . . . . . 30-1
Other Materials . . . . . . . . . . . . . . . . . . . . . 30-1
Measure Crankshaft End Play . . . . . . . . . . . 30-2
Measure Crankshaft Bearing Clearance . . . . . 30-2
Crankshaft Oil Seal
Remove . . . . . . . . . . . . . . . . . . . . . . . . 30-5
Install . . . . . . . . . . . . . . . . . . . . . . . . . . 30-6
Crankshaft
Remove . . . . . . . . . . . . . . . . . . . . . . . . 30-7
Disassemble and Inspect . . . . . . . . . . . . . 30-9

Crankshaft—Continued
Assemble . . . . . . . . . . . . . . . . . . . . . . 30-12
Install . . . . . . . . . . . . . . . . . . . . . . . . . 30-12
Group 35—Gear Housing
Service Equipment and Tools . . . . . . . . . . . . 35-1
Other Materials . . . . . . . . . . . . . . . . . . . . . 35-1
Timing Gear Cover
Remove . . . . . . . . . . . . . . . . . . . . . . . . 35-2
Install . . . . . . . . . . . . . . . . . . . . . . . . . . 35-3
Timing Gears
Remove and Inspect . . . . . . . . . . . . . . . . 35-4
Install Timing Gears . . . . . . . . . . . . . . . . . . 35-5
Gear Housing
Remove . . . . . . . . . . . . . . . . . . . . . . . . 35-6
Install . . . . . . . . . . . . . . . . . . . . . . . . . . 35-7
Group 40—Lubrication System
Service Equipment and Tools . . . . . . . . . . . . 40-1
Other Materials . . . . . . . . . . . . . . . . . . . . . 40-1
Oil Pump
Remove and Inspect . . . . . . . . . . . . . . . . 40-2
Assemble and Install . . . . . . . . . . . . . . . . 40-3
Oil Pressure Regulating Valve
Remove and Install . . . . . . . . . . . . . . . . . 40-4
Adjust . . . . . . . . . . . . . . . . . . . . . . . . . . 40-5
Group 45—Cooling System
Essential Tools . . . . . . . . . . . . . . . . . . . . . 45-1
Service Equipment and Tools . . . . . . . . . . . . 45-1
Thermostat
Service . . . . . . . . . . . . . . . . . . . . . . . . . 45-2
Water Pump
Remove . . . . . . . . . . . . . . . . . . . . . . . . 45-3
Disassemble . . . . . . . . . . . . . . . . . . . . . 45-3
Assemble . . . . . . . . . . . . . . . . . . . . . . . 45-6
Install . . . . . . . . . . . . . . . . . . . . . . . . . . 45-8
Group 50—Carburetor
Carburetor
Remove and Install . . . . . . . . . . . . . . . . . 50-1
Clean . . . . . . . . . . . . . . . . . . . . . . . . . . 50-4
Assemble . . . . . . . . . . . . . . . . . . . . . . . 50-5
Group 55—Governor
Service Equipment and Tools . . . . . . . . . . . . 55-1
Governor
Remove and Inspect . . . . . . . . . . . . . . . . 55-1
Assemble and Install . . . . . . . . . . . . . . . . 55-5

Group 60—Starter
Service Equipment and Tools . . . . . . . . . . . . 60-1
Starter Specifications . . . . . . . . . . . . . . . . . 60-1
Starter Application Chart . . . . . . . . . . . . . . . 60-1
Bench Test Starter . . . . . . . . . . . . . . . . . . . 60-2
Starter Hitachi 0.8 kW
Disassemble and Service . . . . . . . . . . . . . 60-3
Assemble . . . . . . . . . . . . . . . . . . . . . . . 60-7
Nippon Denso 1.0 kW Starter
Disassemble and Service . . . . . . . . . . . . . 60-8
Assemble . . . . . . . . . . . . . . . . . . . . . . 60-15
Group 65—Alternator
Service Equipment and Tools . . . . . . . . . . . . 65-1
Alternator Specifications . . . . . . . . . . . . . . . 65-1
Service 20 A Kokosan Alternator . . . . . . . . . 65-1
Nippon Denso Alternator
Replace Voltage Regulator . . . . . . . . . . . . 65-4
Disassemble . . . . . . . . . . . . . . . . . . . . . 65-6
Test Rotor . . . . . . . . . . . . . . . . . . . . . . . 65-7
Test Stator and Rectifier . . . . . . . . . . . . . 65-9
Assemble . . . . . . . . . . . . . . . . . . . . . . 65-12
Group 70—Ignition System
Service Ignition Coils . . . . . . . . . . . . . . . . . 70-1
Service Ignition Pulsers . . . . . . . . . . . . . . . . 70-2

Key Features of Our Manuals:

Pages: 172
Downloadable PDF format for easy and secure offline access
Written in clear and simple English for better understanding
Includes detailed diagrams and illustrations for quick reference
Designed for users of all skill levels, from beginner to expert
Access – Download available after purchase
Reliable customer support available 24/7 for any assistance
Compatible with all major devices including Windows, Mac, iOS, and Android

Best For:

Technicians servicing John Deere/Yanmar engines
Small engine repair professionals
Lawn and garden equipment service centers
DIY users working on engine maintenance
Training institutions and vocational schools

Why Choose Us?

Official OEM Yanmar engine service manual
Thorough coverage of all systems and components
High-quality PDF with detailed illustrations
Trusted by professionals and engine specialists
Instant and secure PDF download access

Frequently Asked Questions (FAQs)

Q1: What is the format of this manual?
A: This manual is in PDF format, making it easy to read on phones, tablets, laptops, and desktops. No special software needed.

Q2: Is this the official John Deere manual?
A: Yes, this is the official Technical Service Repair manual published by John Deere under the document number CTM12.

Q3: What’s the difference between an operator’s manual and a service manual?
A: An operator’s manual focuses on daily use, maintenance, safety, and basic troubleshooting. A service manual includes advanced repair procedures and diagnostics.

Q4: Can I print this manual?
A: Yes, the PDF is fully printable. You can print the entire manual or specific pages as needed.

Q5: Does it include wiring diagrams?
A: While this manual includes basic electrical system overviews, detailed wiring diagrams are usually found in the technical or service manual.

Q6: Will this work on my mobile phone?
A: Absolutely! It works on iOS and Android phones as well as tablets and computers.

Final Note:

Get to your Yanmar 3TG66, 3TG72 Gasoline Engines Manual with ease. This digital PDF manual gives you everything you need to run your machine safely and efficiently. Whether you’re managing a small farm or working on landscaping projects, this manual is your daily operations companion.

Buy now and get access – your equipment deserves it.