Porsche Diesel Junior F109
Built: 1957–1960 · Series: Junior
More machines from model year 1957
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Porsche Diesel Junior F109 (1957-1960): air-cooled single-cylinder farm tractor with 10.2 kW output and a top speed of 29.9 km/h from the Junior series
Porsche-Diesel was a German manufacturer of air-cooled farm tractors whose range extended from the single-cylinder Junior to larger multi-cylinder models. The Junior F109 was built between 1957 and 1960 and formed the smallest and lightest version of this range.
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The air-cooled single-cylinder engine displaces 822 cm³ and delivers 10.2 kW at 2,250 rpm, equivalent to 14 horsepower. With a weight of 910 kg, a wheelbase of 1,838 mm and a top speed of 29.9 km/h that is high for a small tractor, the Junior was nimble and light yet powerful enough for fieldwork on smaller holdings.
The air-cooled design dispensed with a radiator, water pump and antifreeze, making it low-maintenance and immune to frost damage, though it required unobstructed cooling airflow driven by the flywheel fan. As the smallest model of an engine family built on a modular principle, the Junior shared its base cylinder with larger, multi-cylinder versions from the same maker.
When buying a used Porsche-Diesel Junior, the cooling airflow around the cylinder is the most important thing to check, since blocked or damaged air-guide panels lead to overheating. The condition of the injection pump and starting mechanism also deserve attention, as these parts are frequently worn on vehicles that are today usually more than sixty years old.
Sources: SpecCodex-Register: Kennwerte des Modells Junior F109
Technical data
Engine
| Fuel | dieselcorrect |
|---|---|
| Power | 14 hp (10.2 kW)correct |
| Rated speed | 2,250 rpmcorrect |
| Cylinders | 1correct |
| Displacement | 822 cm³correct |
| Cooling | Lüftkühlungcorrect |
Dimensions and weights
| Length | 2,840 mmcorrect |
|---|---|
| Width | 1,464 mmcorrect |
| Height | 1,536 mmcorrect |
| Wheelbase | 1,838 mmcorrect |
| Ground clearance | 370 mmcorrect |
| Unladen weight | 910 kgcorrect |
Drivetrain and chassis
| Drive | rear-wheel drivecorrect |
|---|---|
| Gearbox | 6/2-Getriebecorrect |
| Front tyres | 4.40-16correct |
| Rear tyres | 8-24correct |
| Top speed | 29.9 km/hcorrect |
Origin and approval
| Construction | frameless unit constructioncorrect |
|---|---|
| Units built | 3,000correct |
Where this model stands
Power-to-weight ratio: 11.2 kW/t (10 kW / 0.9 t)
Power class: Compact (< 40 hp)
Stronger than 3% of the tractors in the register — out of 15,663 models with a stated power figure.
Calculated from the documented figures above — not a rating.
Frequently asked questions
How much power does the Porsche Diesel Junior F109 have?
The Porsche Diesel Junior F109 delivers 14 hp.
How much does the Porsche Diesel Junior F109 weigh?
The unladen weight is 910 kg.
What engine does the Porsche Diesel Junior F109 have?
1 cylinders, 822 cm³ displacement, Diesel.
How fast does the Porsche Diesel Junior F109 go?
Top speed is 29.9 km/h.
What are the dimensions of the Porsche Diesel Junior F109?
2,840 mm × 1,464 mm × 1,536 mm.
When was the Porsche Diesel Junior F109 built?
Production years: 1957–1960.
What to check before buying
- Check the hour meter against the service records — a replaced instrument is the most common gap.
- Compare the data plate and chassis number with the papers.
- Check the weights in the papers against the figures here — attachments change them.
- Check front and rear tyre sizes: mismatched pairs strain the drivetrain.
- Shift the gearbox cold and warm — jumps only show up at temperature.
- Load the hydraulics and watch for sag.
- Ask about parts availability for this build year — 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 20 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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Sources: [1]
Tractor in 3D section
Turn the model, look inside and click an assembly — each one is explained.