3TNM68 Yanmar 3TNM68 Specifications & Technical Data (2015—2026)

Durability & Reliability

The TNV/TNM engines now proudly take up the running as Yanmar’s premium small industrial diesel engines. They offer even more enhanced durability due to better block cooling, a stiffer crank and pistons, and finer tolerance in the journal. CAE analysis has brought lower vibrations and higher strength to the mounting structure for even better reliability in heavy-duty jobs.

Easy Maintenance

Daily checks and servicing of filters and other maintenance points are easy, and that goes a long way towards extending an engine’s service life. In the DI engines, the electric fuel feed pump is standard equipment. Air venting from the fuel system is simple, and the engine’s starting performance is superior, too.

Clean Exhaust

Yanmar research has achieved better flow mixing in both the main chamber and the special mouth around the injector. More efficient use of the intake air produces cleaner burn and low exhaust emissions. Instead of the PFR pump, a newly developed in-line pump is used for the smaller TNV/TNM engines. Precise regulatory compliance is assured by the fact that all adjustment is performed at Yanmar’s own FIE factory. The following features are incorporated: Bigger governor force accelerates the response of the fuel control rack. Engine revolution is more constant and matching with a wide range of machinery simpler. Control of the fuel injection timing according to engine load reduces emissions. Cam profiles are matched to nozzle throttle needs for better injection rate control and lower emission.

Direct Injection (DI) Engines

The fluid energy of the air and fuel charge is bigger and the swirl continues in the chamber during combustion, enhancing mixing and reducing exhaust emissions. The modified angle of the fuel injection nozzle reduces uneven atomization of the fuel between injections. Excellent matching of the intake swirl ratio and combustion chamber shape produces uniform fuel mixing in the combustion chamber. Combustion efficiency, starting, noise and exhaust emission performance are all improved. Use of 2 intake and 2 exhaust valves on the 4TNV98 and 4TNV98T earns big improvements in air intake and expulsion. The vertically mounted injection nozzle minimizes spray pattern imbalance.

Powerful & Compact

Powerful and compact 2-pole generator specifications are available with the 3TNM68, 3TNV70, 3TNM72 and 3TNV76 engines. The compactness is achieved by the improved combustion chamber and a better fuel injection system. They supply large capacity, persevering power for every type of machinery, working always with clean and environment-friendly combustion performance.

The Wide Output Lineup of TNV/TNM Power Packs

The TNV/TNM power pack series covers a wide horsepower range. The lineup consists of four engine groups, each with the optimum design for that output range.

Series 1 (3TNV70, 3TNV76)

Uses the newly developed intake port for the Indirect Injection (IDI) combustion chamber. A newly designed inline FO injection pump replaces the conventional PFR system to reduce exhaust gas emissions and enhance reliability.

Series 2 (3TNV88, 4TNV88)

Uses the newly developed high-pressure mono-plunger FO injection pump, which controls the evenness of fuel injection to each cylinder. A finely chosen nozzle installation angle produces better mixing of the fuel and air to achieve more effective, cleaner combustion.

Series 3 (4TNV98, 4TNV98T)

Uses 2 intake and 2 exhaust valves and an upright nozzle to improve intake and exhaust efficiency. These valves greatly boost combustion performance, hugely reducing exhaust emissions while maintaining the dynamic and persevering power of the engine. Uses Electronic Control system and EGR system to reduce NOx emission --- 4TNV98(T)-Z.