Part of the Yanmar Repair Manuals.
Slide a feeler gauge under a TNE rocker arm with the locknut backed off and you are one wrong number away from a burned valve. Yanmar publication AOA5063-2 T 9701 is the factory service manual that carries those numbers for the TNE series industrial diesels: 2TNE68, 3TNE68, 3TNE74, 3TNE78A, 3TNE82A, 3TNE82, 3TNE84, 3TNE88, 4TNE82, 4TNE84, 4TNE88, and the turbocharged 3TNE84T and 4TNE84T.
Across 136 pages it works through compression-based troubleshooting, valve clearance adjustment, injection timing and nozzle pressure checks, then measuring procedures with service data for the cylinder head, block, pistons, connecting rods, camshaft, and crankshaft. The YPFR and YPES fuel injection pumps, the governor, and the turbocharger with its waste gate get their own disassembly and inspection sections.
Guess at a clearance and you pay for it with a second teardown. Measure against the service data in this PDF and the engine goes back together once.
Complete the set for your TNE Series
- Parts Catalog: Yanmar 3TNE68, Y00V3629 Engine Parts Catalog
- Parts Catalog: Yanmar 4TNE88 Small Vertical Engine Parts Catalog
- Parts Catalog: Yanmar 4TNE88 Parts Catalog
What's Inside This Manual
| System | Pages | Key Topics |
|---|---|---|
| Specifications and Performance | 7-19 | 2TNE68, 3TNE68, 3TNE74, 3TNE78A, 3TNE82A, 3TNE82, 3TNE84, 3TNE88 |
| Cross Sectional Views | 20-21 | 2-1 Special Swirl Pre-Combustion Chamber System, 2-2 Direct Injection System |
| Cooling Water,Lubricating Oil and Fuel Oil | 22-24 | 3-1 Cooling Water, 3-2 Lubricating Oil, 3-3 Fuel Oil |
| Troubleshooting | 25-27 | 4-1 Trouble Causes and Remedies, 4-2 Trouble Diagnousis Through Measurement of Compression Pressure |
| Special Service Tools and Measuring Instruments | 28-32 | 5-1 Special Service Tools, 5-2 Measuring Instruments |
| Measurement,Inspection and Adjustment | 33-47 | 6-1 Measuring the Compression Pressure, 6-2 Adjusting the Valve Head Clearance, 6-3 Checking the V-Belt Tension |
| Measuring Procedures,Service Data and Corrective Action | 48-74 | Cylinder Head, Cylinder Block, Valve Rocker Arm, Piston, Piston Ring, Connecting Rod, Camshaft, Crankshaft |
| Disassembly and Reassembly | 75-83 | 8-1 Disassembly, 8-2 Precautions Before and During Reassembly |
| Service Data | 84-89 | Cylinder Head, Cylinder Block, Valve Rocker Arm, Piston, Piston Ring, Connecting Rod, Camshaft, Crankshaft |
| Tightening Torque | 90 | 10-1 Main Bolt/Nut, 10-2 Standard Bolt and Nut |
| Fuel Injection Pump for Indirect Injection System | 91-95 | 11-1 Exploded views(YPFR Type), 11-2 Disassembly, 11-3 Inspection, 11-4 Reassembly |
| Fuel Injection Pump for Direct Injection System | 96-108 | 12-1 Exploded Views(YPES Type), 12-2 Special Service Tools for Disassembly and Reassembly, 12-3 Disassembly, 12-4 Inspection, 12-5 Reassembly |
| Governor | 109-120 | 13-1 Exploded Views of Governor for Indirect Injection System, 13-2 Exploded Views of Governor for Direct Injection System, 13-3 Disassembly, 13-4 Inspection, 13-5 Reassembly |
| Turbocharger | 121-126 | 14-1 Specifications, 14-2 Construction, 14-3 Waste Gate Valve Adjusting Method, 14-4 Exploded View of Turbocharger(w/Waste Gate), 14-5 Tightening Torque, 14-6 Service Standards |
| Service Information for Carb Ulg Regulation | 127-133 | 15-1 Emission Control Labels, 15-2 Limiting the High Idle and Low Idle Adjustment Screw, 15-3 Limiting the Fuel Volume Limiter Screw |
| Attached Drawing 1. Exploded Views of Engine Components | 134 | Exhaust Manifold, High-Pressure Fuel Pipe, Fuel Injection Nozzle, Cylinder Head Assembly, Piston, Connecting Rod |
| Attached Drawing 2. Exploded Views of Engine Components | 135-136 | Fuel Injection Pump, Camshaft Assembly, Crankshaft V-Pulley, Gear Case, Crankshaft, Main Bearing Cap |
Quick Reference Specifications
| Specification | Value | Page |
|---|---|---|
| All Models | ||
| Cylinder head gasket replacement | Replace the gasket. | p. 27 |
| Nozzle gasket replacement | Replace the gasket. | p. 27 |
| Intake/exhaust valve head clearance (Adjustment) | 0.15 - 0.25 mm | p. 35 |
| 2TNE68 | ||
| Fuel injection timing (FID, b.T.D.C.) | 14±1 deg (VM), 16±1 deg (CH, VH) | p. 7 |
| Engine Displacement | 0.523 L | p. 7 |
| 3TNE68 | ||
| Fuel injection timing (FID, b.T.D.C.) | 14±1 deg (VM), 16±1 deg (CH, VH) | p. 8 |
| 2/3TNE68 | ||
| Valve sinking depth (Intake valve) Standard | 0.3-0.5 mm | p. 48 |
| 2TNE68, 3TNE68, 3TNE74 | ||
| Compression Ratio (Indirect Injection) | 23.0 | p. 7 |
| 3TNE78A, 3TNE82A, 3TNE82, 3TNE84, 3TNE88, 4TNE82, 4TNE84, 4TNE88, 3TNE84T, 4TNE84T | ||
| Compression Ratio (Direct Injection) | 18.0 | p. 10 |
| Fuel Injection Timing (Direct Injection, CL) | 10±1 deg | p. 10 |
| 2TNE68 (VM/CH), 3TNE68 (VM/CH), 3TNE74 (VM/CH) | ||
| Fuel Injection Timing (Indirect Injection, VM/CH) | 14±1 deg | p. 7 |
| 2TNE68 (VM/CH) | ||
| Lubricating Oil Capacity (Max/Effective) | 1.6/0.6 L | p. 7 |
