Yanmar TNM Series

The register lists here two versions, 3TNM68 and 3TNM72, with 14.7 to 18.2 kW or 20.0 to 24.7 hp at 3,600 rpm; displacement ranges from 784 to 903 cm³, dry weight from 77 to 83 kg. Both are water-cooled, naturally aspirated three-cylinder diesel engines meeting the EU Stage V emission standard.

Water-cooled small diesel engines of the TNM range are used in compact construction machinery such as mini excavators, in agricultural machinery and in stationary installations such as compressors and welding sets, where a more even temperature behaviour and higher continuous output are wanted compared with air-cooled engines; Yanmar supplies such engines as components to numerous makers of construction machinery and equipment worldwide who fit them into their own machines.

When buying used, what counts on these water-cooled three-cylinder engines is the tightness of the cooling system, the condition of the water pump and thermostat, and compression and oil consumption; loss of coolant often points to a leaking head gasket, and milky-coloured oil points to the same fault. Spare parts run through Yanmar's industrial engine distribution.