Yanmar 3TNM72
Series: TNM Series
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Yanmar TNM Series – water-cooled small diesel engines of the register: 3TNM68 and 3TNM72, three-cylinder units from Yanmar's TN engine family for construction machinery and agricultural equipment
The Yanmar TNM Series brings together on this collective page two water-cooled small diesel engines: 3TNM68 and 3TNM72. Yanmar was founded in 1912 in Osaka and is one of the most long-established Japanese engine makers; in the type designation of the TN engine family, the leading digit denotes the number of cylinders, so both engines listed here are three-cylinder units from a family Yanmar offers in numerous versions for a wide range of drive tasks.
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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.
Sources: SpecCodex register, model data: Yanmar TNM Series, Yanmar (manufacturer)
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 24.7 hp (18.2 kW)correct |
| Cylinders | 3correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Dry weight | 83 kgcorrect |
|---|
Other data
| Aspiration | naturally aspiratedcorrect |
|---|---|
| Bore × stroke | 72x74correct |
| Dimensions | 450x416x506correct |
| Displacement | 903 lcorrect |
| Emission stage | EU Stage Vcorrect |
| Speed | 3,600 rpmcorrect |
Frequently asked questions
How much power does the Yanmar 3TNM72 have?
The Yanmar 3TNM72 delivers 24.7 hp.
What engine does the Yanmar 3TNM72 have?
3 cylinders, Diesel.
What to check before buying
- Match the data plate against the order: frame size, mounting and rating have to agree.
- For used units, ask about winding condition and bearing play.
- Ask about parts availability for this series — the running costs hang on it.
A general list for this type of machine — no substitute for an inspection or an appraiser.
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This page carries 12 individual figures for this model. They come from 1 recorded source; every figure can be traced there. What we cannot document is not here — we leave gaps open rather than estimate them.
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Other models in this series
Sources: [1]
Diesel engine in 3D section
Turn the model, look inside and click an assembly — each one is explained.