![]() ![]() Seawater is pumped into the engine through a seawater pump ( impeller type). The 2GM20 series uses either a direct seawater cooling system, or an indirect freshwater cooling system (specified by the suffix letter F i.e. ![]() Cooling seawater enters from the tube on the left. After a few minutes, the hot cooling water alarm will sound if the cooling water does not get through the engine (as when the seawater cock has remained closed -most likely case- or if something is clogging the seawater tubing). The exit of cooling water from the exhaust into the sea (typically at the aft of the boat) should be checked at that time. Upon turning the key and pressing the starting motor switch, the oil pressure alarm will ring for about a second until the engine starts to run. The engine is typically activated by a key and a starting motor switch. 12V, 1 kW), and an alternator to provide electricity and charge onboard batteries (12 V, 55 A). The engine is equipped with a starting motor (D.C. The engine delivers roughly 16 horsepower, for a weight of about 114 kg. The maximum output at the crankshaft is 13.4 kW, at 3600 rpm. The continuous rating output at the crankshaft is 11.8 kW, at 3400 revolutions per minute (rpm). ![]() The compression system uses a proprietary swirl-type pre- combustion chamber. It is built around two cylinders (hence the "2" in 2GM20) of 75 mm in diameter and 72 mm in stroke, adding up to 0.635 litres in displacement: each cylinder is roughly the size and volume of a 300 ml soft-drink can. It is a four-stroke, vertical, water-cooled diesel engine. It is used in a wide range of sailboats and motorboats. The Yanmar 2GM20 is an inboard marine diesel engine manufactured by the Japanese company Yanmar Co. The center pulley is the crankshaft, the lower left one the seawater pump, the upper right one the alternator. A Yanmar 2GM20 marine diesel engine, installed in a sailboat. ![]()
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