Yanmar TNE Series Engine Service Repair Manual

Applicable Engine Model:
2TNE: 2TNE68
3TNE: 3TNE68, 3TNE74, 3TNE78A, 3TNE82A, 3TNE82, 3TNE84, 3TNE84T, 3TNE88
4TNE: 4TNE82, 4TNE84, 4TNE88, 4TNE84T
1. Specifications and Performance ………………………………………………………………. 1-1
1-1 2TNE68……………………………………………………………………………………………….. 1-1
1-2 3TNE68 ……………………………………………………………………………………………….. 1-2
1-3 3TNE74 ……………………………………………………………………………………………….. 1-3
1-4 3TNE78A ……………………………………………………………………………………………. 1-4
1-5 3TNE82A …………………………………………………………………………………………….. 1-5
1-6 3TNE82 ……………………………………………………………………………………………….. 1-6
1-7 3TNE84……………………………………………………………………………………………….. 1-7
1-8 3TNE88 ……………………………………………………………………………………………….. 1-8
1-9 4TNE82……………………………………………………………………………………………….. 1-9
1-10 4TNE84……………………………………………………………………………………………….. 1-10
1-11 4TNE88……………………………………………………………………………………………….. 1-11
1-12 3TNE84T……………………………………………………………………………………………… 1-12
1-13 4TNE84T……………………………………………………………………………………………… 1-13
2. Cross Sectional Views………………………………………………………………………………… 2-1
2-1 Special Swirl Pre-combustion Chamber System …………………………………………. 2-1
2-2 Direct Injection System …………………………………………………………………………… 2-2
3. Cooling Water, Lubricating Oil and Fuel Oil ………………………………………………… 3-1
3-1 Cooling water……………………………………………………………………………………….. 3-1
3-2 lubricating oil …………………………………. ……………………………………………………. 3-1
3-3 Fuel oil ……………………………………………………………………………………………………… 3-3
4. Troubleshooting……………………………………………………………………………………………… 4-1
4-1 Trouble causes and remedies…………………………………………………………………. 4-1
4-2 Trouble diagnosis through measurement of compression pressure……………… 4-3
5. Special Service Tools and Measuring Instruments…………………………………………… 5-1
5-1 Special service tools ……………………………………………………………………………….. 5-1
5-2 Measuring instruments…………………………………………………………………………… 5-3
6. Measurement, Inspection and Adjustment …………………………………………………. 6-1
6-1 Measuring the compression pressure ……………………………………………………… 6-1
6-2 Adjusting the valve head clearance ……………………………………………………… 6-3
6-3 Checking the V-belt tension ……………………………………………………… 6-4
6-4 Measuring and checking the injection pressure and spray patterns
of the fuel injection valve………………………………………………………………………… 6-4
6-5 Checking and adjusting the fuel injection timing………………………………………… 6-8
6-6 Adjusting the no-load maximum (or minimum) revolutions……………………….. 6-10
6-7 Checking the cooling water system and radiator for water leakage ……………… 6-10
6-8 Checking the battery …………………………………………………………………………….. 6-11
6-9 Checking sensors …………………………………………………………………………………. 6-13
6-10 Checking the oil cooler………………………………………………………………………… 6-14
6-11 Checking the piston cooling nozzle ……………………………………………………….. 6-15

Before starting service and maintenance of TNE engine, you are requested to read this Service Manual carefully to your full understanding and to take careful note that the standard TNE engine may differ in the structure and applicable specification from that loaded on each of individual driven machines (such as the generator, pump, compressor, and combine, etc.).