Part of the Yanmar Repair Manuals.
From the cylinder head torque sequence to the trochoid oil pump, this 280-page Yanmar factory service manual takes the 3TNM68 and 3TNM72 industrial diesels apart system by system: engine internals, fuel system, cooling, lubrication, starter motor, alternator, wiring, and a dedicated troubleshooting chapter.
Every rebuild stalls at the same place, and it is never the wrenching. It is the one number you do not have: a bearing clearance, a valve gap, an injection pressure, a bolt torque. The Engine chapter carries cylinder head, camshaft, timing gear train, crankshaft and piston specifications, so the measuring happens at the bench instead of in a forum thread.
Delivered as a PDF (17.69 MB, English, 2008, publication 0BTNM-G00100) with 336 bookmarks for jumping straight to a section. Download it after checkout and print only the pages that go to the bench.
What's Inside This Yanmar 3TNM68, 3TNM72 Manual
| System | Pages | Key Topics |
|---|---|---|
| Yanmar Warranties | 9-16 | Yanmar Limited Warranty, Emission System Warranty, Yanmar Co., Ltd. Limited Emission Control System Warranty - Usa Only |
| Safety | 17-36 | |
| General Service Information | 37-64 | Component Identification, Location of Labels, EPA / Carb Emission Control Regulations - Usa Only, Emission Control Labels, The 97/68/EC Directive Certified Engines, Engine Family |
| Periodic Maintenance | 65-102 | Introduction, Precautions, Periodic Maintenance Schedule, Periodic Maintenance Procedures |
| Engine | 103-162 | Before You Begin Servicing, Introduction, Cylinder Head Specifications, Camshaft and Timing Gear Train Specifications, Crankshaft and Pistons Specifications |
| Fuel System | 163-190 | Before You Begin Servicing, Introduction, Fuel System Specifications, Special Service Tools, Measuring Instruments, Fuel System Diagram, Fuel System Components |
| Cooling System | 191-200 | Before You Begin Servicing, Introduction, Cooling System Diagram, Engine Coolant Pump Components, Engine Coolant System Check, Engine Coolant Pump |
| Lubrication System | 201-210 | Before You Begin Servicing, Introduction, Oil Pump Service Information, Lubrication System Diagram, Trochoid Oil Pump |
| Starter Motor | 211-230 | Before You Begin Servicing, Introduction, Starter Motor Information, Starter Motor Specifications, Starter Motor Troubleshooting, Starter Motor Components |
| Alternator | 231-252 | Before You Begin Servicing, Introduction, Standard and Optional Dynamo Information, Standard and Optional Alternator Information, Alternator Specifications, Dynamo Specifications |
| Electric Wiring | 253-260 | Electric Wiring Precautions, Electric Wire Resistance, Battery Cable Resistance, Electrical Wire Sizes - Voltage Drop, Conversion of Awg to European Standards |
| Troubleshooting | 261-279 | Special Service Tools, Troubleshooting by Measuring Compression Pressure, Quick Reference Table for Troubleshooting |
