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W12 by Wahl: single-cylinder engine rated at 8.8 kW (12 hp) with combined water-air cooling, built between 1953 and 1958.
The Wahl W12 belongs to the class of simple single-cylinder tractors of the 1950s, of the kind smaller manufacturers built for affordable basic mechanisation of small farms.
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The W12 is powered by a single-cylinder engine of 850 cm³ displacement, delivering 8.8 kW (12 hp) at 2,000 rpm. At an unladen weight of 935 kg, a height of 1,290 mm, a length of 2,420 mm and a top speed of 22.8 km/h, the tractor is a very light, compact small tractor with combined water and air cooling.
Single-cylinder tractors of this power class were simply built and easy to maintain, with correspondingly limited pulling power for light field work and driving small implements. The combination of water and air cooling was a pragmatic solution typical of this transitional period.
On a used W12, it is worth checking the single-cylinder engine's compression and the functioning of both cooling systems, since combined cooling is harder to diagnose when faulty than a simple solution. The availability of parts for this rare engine should also be established beforehand. A test drive and a check of every lever and control also belong to a thorough inspection. The overall condition of the paint and sheet metal also gives clues about how the machine was stored over the years. Complete documentation of earlier repairs further helps in judging the machine's true condition.
Sources: SpecCodex-Register: Kennwerte des Modells W12
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