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Mamod SP3 Meccano steam engine


When Mamod stopped making the Meccano engine for Meccano (to be sold under the Meccano name) they renumbered it SP3, updating it with a solid fuel burner, water sight glass and whistle. They also changed the colour to metallic silver-grey.

The boiler is a fairly standard Mamod one. It has a chrome plated cover extending right over the top of the boiler, as on the MEC1. The boiler is 1 3/4" dia x 4 1/2" long. It has a standard Mamod 1/4" safety valve, a water level sight glass and a whistle, but no steam dome.

The engine is a single cylinder, single acting oscillating cylinder type with a reversing lever which operates by shifting the trunnion. The crank shaft and flywheel are almost standard Mamod except that the shaft diameter is Meccano standard 5/32". The crankshaft was fitted with a Meccano standard gear wheel and chain sprocket, but they are missing from this example. There is a pulley turned into the boss of the flywheel.

The whole thing is riveted together, which would make restoration a bind. Fortunately, it is in reasonably good condition so I've left it as is.

Make Model Made Description Cylinders Cylinder Type
Mamod SP3 1979-84 Engine for Meccano 1 Single acting reversible
Bore mm Stroke mm Valve Type Boiler Type Fuel Mechanical Condition
8 20 Oscillating Cylinder (reversible) Horizontal Solid fuel tablets Good
Cosmetic Condition Paintwork Packaging Purchased Purchase cost Additional cost
Fair Original but damaged
27/8/2012 30