Keep your industrial or construction equipment running at peak performance with the Yanmar TNM Series (3TNM68 & 3TNM72) Service Repair Manual. This professional-grade technical manual is the definitive resource for mechanics, fleet owners, and DIY enthusiasts who need to perform maintenance, deep-system diagnostics, or complete engine overhauls.

The Yanmar "Minimax" TNM series is legendary for its compact power and reliability. This manual provides the factory-spec data required to ensure these high-efficiency diesel engines stay in top working condition for years to come.



Product Specifications





Engine Series: Yanmar TNM (Minimax)



Models Covered: 3TNM68 and 3TNM72



Engine Type: 3-Cylinder, Liquid-Cooled, 4-Cycle Diesel



Document Type: Service Repair / Workshop Manual



Language: English



Whats Included in This Service Manual?

This manual goes beyond basic oil changes, providing comprehensive, step-by-step instructions for every major engine system:





General Information: Engine identification, general specifications, and specialized tool requirements.



Engine Disassembly & Reassembly: Detailed procedures for the cylinder head, valves, pistons, connecting rods, and crankshaft.



Fuel Injection System: Critical timing data, fuel injection pump removal, and injector nozzle testing/servicing.



Lubrication System: Oil pump inspection, oil pressure testing, and passage cleaning.



Cooling System: Water pump service, thermostat testing, and radiator maintenance.



Electrical System: Starter motor and alternator teardown, wiring diagrams, and sensor testing.



Troubleshooting & Diagnostics: Extensive "Symptom vs. Cause" charts for hard starting, smoke issues, power loss, and unusual noises.



Technical Data: Precise torque specifications, clearance tolerances, and wear limits for all moving parts.



Common Applications

These Yanmar engines are the heartbeat of many popular machines. This manual is essential for owners of:





Mini Excavators (e.g., Wacker Neuson, Takeuchi, Ammann)



Compact Utility Tractors



Generators & Industrial Power Units



Professional Mowers & Turf Equipment



Why You Need This Manual





Avoid Catastrophic Failure: Diesel engines require precise timing and clearances. Following factory specs prevents internal damage during repair.



Professional-Grade Accuracy: Stop guessing. Get the exact torque values for every bolt and the specific fuel injection settings required for Tier 4 compliance/efficiency.



Save on Labor Costs: With clear diagrams and logical instructions, you can perform complex repairs in-house, significantly reducing downtime and service bills.



Historical Maintenance: Use the "Inspection and Measurement" section to document engine wear and plan for future maintenance before a breakdown occurs.



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3TNM72 Technical Manual