Yanmar 3TNM74F
Series: 3TNM Series
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Yanmar 3TNM74F – compact three-cylinder diesel engine of the 3TNM series from Japan: 993 cm³ displacement, water-cooled, 17.8 kW/23.9 hp at 3,600 rpm, EPA Final Tier 4, 88 kg dry weight
Yanmar is a Japanese engine manufacturer based in Osaka, known besides farm machinery chiefly for compact diesel industrial engines in the small to mid power range. The 3TNM74F belongs to the 3TNM series, a range of small three-cylinder diesel engines that Yanmar supplies for installation in other manufacturers' machinery and equipment rather than fitting into its own end products.
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The engine is a water-cooled three-cylinder unit of 993 cm³ displacement, built from a bore and stroke of 74 to 77 mm – the stroke slightly exceeds the bore, making it a mildly long-stroke design. Without turbocharging it delivers 17.8 kW or 23.9 hp at 3,600 rpm, and at dimensions of 450 x 416 x 506 mm it weighs only 88 kg dry.
Engines of this size and weight are built for compactness rather than high output per litre, and are found in mini excavators, small compressors, pumps and generator sets, where installation space and weight are more tightly constrained than in agricultural applications. Certification to EPA Final Tier 4 places it in the United States in the strictest emissions tier for nonroad diesel engines of this power class, achieved without exhaust aftertreatment such as a particulate filter.
When buying a small, high-revving diesel engine like this used, the main checks are smooth running at rated speed, the condition of the injection pump and the tightness of the cooling system, since the compact design leaves little margin against overheating. Anyone buying the engine removed from another machine should additionally check for damaged mounting flanges and a complete set of intake, exhaust and cooling lines, since Yanmar itself does not supply it as a finished end product.
Sources: SpecCodex-Register: Kennwerte des Modells Yanmar 3TNM74F
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 23.9 hp (17.8 kW)correct |
| Cylinders | 3correct |
| Cooling | water-cooledcorrect |
Dimensions and weights
| Dry weight | 88 kgcorrect |
|---|
Other data
| Aspiration | naturally aspiratedcorrect |
|---|---|
| Bore × stroke | 74x77correct |
| Dimensions | 450x416x506correct |
| Displacement | 993 lcorrect |
| Emission stage | EPA Final Tier 4correct |
| Speed | 3,600 rpmcorrect |
Frequently asked questions
How much power does the Yanmar 3TNM74F have?
The Yanmar 3TNM74F delivers 23.9 hp.
What engine does the Yanmar 3TNM74F 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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Diesel engine in 3D section
Turn the model, look inside and click an assembly — each one is explained.