Searching for the exact rebuild procedures for your 2008 Yanmar industrial engine? This 280-page Yanmar 3tnm68, 3tnm72 service manual pdf (OEM #0BTNM-G00100) breaks down every internal component, fuel system, and electrical circuit for the 3TNM68 and 3TNM72 powerplants. You get full electrical wiring diagrams, complete troubleshooting charts based on compression pressure readings, and detailed exploded views for the entire cylinder head assembly. Open to the periodic maintenance schedules to find exact service intervals for cooling, lubrication, and fuel injection systems. Replace the engine oil filter after the initial 50 hours, then lock down the 3TNM72 cylinder head bolts to exactly 40-43 ft-lb (53.9-57.9 N-m) during reassembly. Guessing at internal clearances destroys motors. Grab this bookmarked digital file, pull it up on your shop tablet, and get the engine running right.
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 |
Yanmar 3TNM68, 3TNM72 Common Problems This Manual Covers
Yanmar 3TNM68 and 3TNM72 engine hard starts after sitting or will not start in cold weather p. 169
Inspect the fuel lines for air leaks and replace the fuel filter if it exceeds the replacement interval on page 81 of every 500 hours. Torque the fuel injectors to 36.1 - 39.1 ft·lb (49 - 53 N·m; 5.0 - 5.4 kgf·m) as shown on page 169.
Manual Section: Fuel System TroubleshootingEngine overheats under heavy load and pushes coolant out of the radiator overflow p. 59
Test the thermostat opening temperature in a water bath. Replace the unit if it fails to open between 157 - 163°F (70 - 73°C) according to the specifications on page 59. Check the radiator core for heavy blockages and verify the fan belt tension is tight.
Manual Section: Engine Cooling System TroubleshootingStarter motor cranks slowly or engages intermittently during early morning cold weather operation p. 257
Measure the battery cable resistance using a digital multimeter. Clean or replace cables if total resistance is not less than 0.002 Ω as specified on page 257 for systems with a starter motor under 2.68 hp (2 kW). Inspect battery terminals for heavy corrosion.
Manual Section: Starter Motor Electrical System TroubleshootingEngine loses power under heavy load and blows excessive black exhaust smoke continuously p. 36
Check the air filter element for heavy debris. Measure the intake system and clean components if the maximum air intake restriction exceeds 0.90 psi (6.23 kPa; 635 mmAq) as detailed on page 36. Verify the fuel injection pressure is within the correct operating range.
Manual Section: Air/Exhaust Gas System TroubleshootingFrequently Asked Questions
How do I reset the throttle or speed control?
The manual advises against attempting to adjust the low or high idle speed limit screw yourself, as this may impair the safety and performance of the machine and shorten its life. If adjustment is required, you should contact your authorized Yanmar industrial engine dealer or distributor.
Document Quality
This document is a scanned PDF with an OCR layer, allowing you to search and copy the full text. Text quality is crisp and easy to read on all pages. Diagrams and illustrations are raster images, but their labels are clear and legible. Page condition is clean with minimal scan artifacts, and several pages are explicitly marked as intentionally blank.
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