Yanmar TN-S Series
1 model in this series
Yanmar 4TN98S – water-cooled four-cylinder diesel engine of the TN-S series with 3,319 cm³ displacement, 36.3 kW/49.4 hp at 2,100 rpm, long-stroke design, certified to Indian CEV and Bharat Stage III/IIIA norms
In the TN-S series, Yanmar supplies mid-size industrial diesel engines certified chiefly for the Indian market; the 4TN98S carries the local CEV emission approval and Bharat Stage III, or Bharat Stage IIIA for tractors.
Read on 3 more paragraphs
The engine is a naturally aspirated, water-cooled four-cylinder unit of 3,319 cm³ displacement with a bore of 98 mm and a stroke of 110 mm – the stroke clearly exceeds the bore, making it a long-stroke design, as is typical of low-speed farm-machinery engines. It delivers 36.3 kW or 49.4 hp at 2,100 rpm, weighs 235 kg dry and measures 740 x 495 x 750 mm.
Certification to CEV (Central/Construction Equipment Vehicles) and Bharat Stage III, or Stage IIIA for tractors, places the engine within India's own emission rules for nonroad and agricultural engines, which apply independently of the European Stage and American Tier norms. The low rated speed of 2,100 rpm combined with relatively large displacement is typical of engines built for pulling power and durability rather than high revs, as needed in tractors and stationary farm machinery.
When buying a naturally aspirated four-cylinder of this size used, the first checks are the condition of the injection pump, compression and oil consumption, since non-turbocharged engines tend to show wear through falling compression rather than lost boost pressure. The radiator, water pump and cylinder head gasket should be checked for leaks, and with an engine certified for the Indian market it is worth checking the availability of local spare parts outside its home region.
Sources: SpecCodex-Register: Kennwerte des Modells Yanmar 4TN98S
Models
Diesel engine in 3D section
Turn the model, look inside and click an assembly — each one is explained.
