![]() Unusually, the seawater cooling pump was driven by a single vee-belt from the crankshaft and, although electric starting was standard, it was possible to start the 2GM by hand using a handle that slotted onto the forward end of the camshaft. As the 2GM was designed from the start as a marine engine, it had thermostat-controlled raw (salt) water cooling, which, according to Yanmar agent Richard Minard was very reliable due to its inherent simplicity. Released in the late 70s, the Yanmar 2GM was the forerunner of the 2GM20 and developed 13hp (based on 1.0hp equaling 746W) at 3300rpm with a maximum continuous rating of 11.8hp at 3200rpm.ĭisplacing 586cc, this twin-cylinder indirect injection diesel with pushrod OHV operation had a 'square' bore/stroke design of 72mm and, complete with mechanical gearbox, weighed 100kg. ![]()
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