TNV Series 13.3-83.8hp

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THE TNV SERIES ADDS A WHOLE RANGE OF “GOODIES” THAT MAKE THIS ENGINE A MECHANICAL “WORK OF ART”.

The new TNV Series engines delivers a host of new features to bring the acclaimed ‘clean and silent’ TNE Series to a whole new performance level. Meaning Total New Value, the Yanmar TNV Series offers a range of new engine improvements to make these popular work horses even more efficient, more quiet and more refined than ever.

The smaller Indirect Injection (IDI) engines have been made more efficient with Yanmar Researchers improving engine combustion by altering flow mixing of air and fuel while a new, more compact in-line fuel injection pump has been developed for the TNV Series for faster fuel control and lower emissions.

The larger Direct Injection (DI) engines have also seen a makeover. Uneven atomisation of fuel in the combustion chamber has been reduced by changing the angle of the injector nozzle. A greater swirl effect in the combustion chamber has been achieved to increase the fluid energy of the air and fuel charge plus a new MP fuel injection pump delivers high injection pressure and more even injection between the cylinders. Uniform atomisation is further enhanced with a more perforated fuel injection nozzle and engine noise is minimised with an optimised cylinder block and muffler design.

TNE is now the new TNV delivering Total New Value for Yanmar diesel owners.

Emission Reduction – A Cleaner Engine

IDI ENGINE

Combustion Chamber

By investigating flow characteristics using experimental and numerical analysis methods, Yanmar research has achieved improved flowmixing in both the main chamber and the special mouth surrounding the injector. More efficient use of the incoming air charge results in cleaner burn and lower exhaust emissions.

FUEL INJECTION EQUIPMENT MECHANICAL PUMP

Instead of a PFR pump, a newly developed in-line pump has been used for the smaller TNV engines. Adjustments are made solely in the Yanmar`s own FIE factory ensuring precise compliance with regulations. Also the following features are incorporated: to conventional chambers.

  • Increased force is applied by the governor to quicken the fuel controlling rack response time.
  • Engine revs are more constant.
  • Emissions have been reduced by controlling fuel injection timing according to engine load.
  • Cam profiles are matched to nozzle throttle needs, which give a better-controlled injection rate.
  • Emissions are reduced.
DI ENGINE
  • Water Cooled by Radiator
  • Vertical Multi Cylinder
  • Most models Direct Injection (lower HP models IDI)

NOZZLE INSTALLATION ANGLE

The installation angle of the fuel injection nozzle is greater than that of conventional engines, so that uneven atomization of fuel between injections can be reduced. Excellent matching between intake swirl ratio and the shape of the combustion chamber results in uniform mixing of fuel in the combustion chamber. Therefore, performance including combustion efficiency, start ability, noise, and exhaust emission has been improved.

COMBUSTION CHAMBER

Fluid energy of the air and fuel charge is increased. The swirl effect produced in the chamber continues while combustion occurs, aiding mixing and results in lower exhaust emissions compared to conventional chambers.

FUEL INJECTION EQUIPMENT

A new MP pump has been developed especially for the TNV engine series. Our aim was to make improvements over a wide range of areas to even further reduce emissions. Features are:

  • High injection pressure
  • Use of a mono plunger reduces uneven injection between the cylinders.
  • Timing Control Device system optimizes injection to take into account speeds, loads and the startup phase.
  • New mechanical governor helps to maintain cleaner exhausts.
  • Minimal variation from chosen revs at low speed using constant pressure valve.

FUEL INJECTION NOZZLE

Multiple numbers of very small holes are used to achieve uniform atomization.

  • holes are not simply drilled, their inside edges are carefully rounded to promote even flow and direction of spray, also to reduce resistance.
  • Low sack nozzle profile improves combustion. Double corn shape protects from cavitations.

Noise Level reduction

CYLINDER BLOCK NOISE REDUCTION

Yanmar’s original CAE techniques have optimized the stiffness, minimized transformation, and reduced radiant noise.

MUFFLER NOISE REDUCTION

Original CAE technique is used to design a muffler with optimized volumes and sound isolation materials.

For more information, please go to the specific engine model.

MODEL Max Output Bore x Stroke (mm) Displacement (litres) Dry Weight(kg)
2TNV70 13.3mhp @ 3600rpm 70 x 74 0.570 73
3TNV70 20.8mhp @ 3600rpm 70 x 74 0.854 87
3TNV76 24.4 mhp @ 3200rpm 76 x 82 1.116 94
3TNV82A 29.4mhp @ 3000rpm 82 x 84 1.331 111
3TNV84T 39.0mhp @ 2800rpm 84 x 90 1.496 150
3TNV88 26.3mhp @ 3000rpm 88 x 90 1.642 138
4TNV84T 55.2mhp @ 3000rpm 84 x 90 1.995 165
4TNV88 46.9mhp @ 3000rpm 88 x 90 2.190 160
4TNV98 68.5mhp @ 2500rpm 98 x 110 3.319 235 (SAE#4)
4TNV98T 83.8mhp @ 2500rpm 98 x 110 3.319 245

TNV Series 13.3-83.8hp product range