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The Mamod SP5 is the updated SP series version of the twin cylinder SE3. Apart from the updated SP styling, the main differences are the reversing mechanism, a larger flywheel and the base mounted cast chimney, common to most of the SP series. This model was introduced in 1979. A substantially modified version, commonly known as the Mk2, was introduced around 2000.
It has two single acting oscillating cylinders. The engine has a reversing lever which shifts both cylinders together to align with forward and reverse ports. A pulley is mounted on the crankshaft adjacent to the flywheel. On the boiler are a safety valve and a whistle. The chimney, mounted on the base instead of the boiler, has the exhaust steam fed to it, via a pair of pipes from the cylinders, but not the burner exhaust. The burner is a plain tablet type tray incorporating a guard. The steam feed has no superheating. The horizontal brass boiler rests on the firebox, held in place by the shaped ends of the firebox. The Base is a pressed steel example with an area of Meccano-standard holes to one side. The engine components are mounted on a shallow plinth. The boiler dimensions are 1.75" diam. x 6" long and the cylinders 5/16" diam. x 5/8" stroke. The colour scheme is typical of the SP series with a red base, blue engine frames, silver plinth and black firebox. The flywheel spokes are also red. The boiler and the cylinders are unpainted brass.
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