When the engine has to be bled because air has penetrated into the pipes (usually after running out of diesel), it will usually be necessary to bleed the diesel filter: the top vent is unscrewed so as to let excess air escape, while diesel fuel is pumped into the fuel filter with the manual fuel lift pump (just behind the yellow dipstick). Water inside diesel fuel can lead to rusting of the internals of the engine, as well as lubrification problems. The filter allows to retain dust particules and separate water from diesel (as water is heavier than diesel, it will settled at the bottom of the filter), just before the diesel fuel enters the highly sensitive high-pressure fuel pump. The seawater pump is rotated by a short belt linked to the crankshaft.Īn inline fuel filter is easily accessible from the front part of the engine.
The impeller of the seawater can suffer from wear and tear, especially when run dry for some period of time, in which case it has to be replaced to avoid loss in the flow of cooling seawater, a potential source of engine overheating. The engines equiped with a freshwater cooling system have an additional heat exchanger, where heat transfer occurs between the seawater and internal freshwater. In the engines equiped with a seawater cooling system, seawater is used to cool the internals of the engine directly.
Seawater is pumped into the engine through a seawater pump ( impeller type).
#Yanmar 2gm cooling pump series#
The 2GM20 series uses either a seawater cooling system, or a freshwater cooling system (specified by the letter F). After a few minutes, the hot cooling water alarm will again 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 hot cooling water alarm and 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, 1kW), 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 20 horsepowers (hence the "20" in 2GM20), for a weight of about 114 kg. The maximum output at crankshaft is 13.4 kW, and 3600 rpm. The continuous rating output at the crankshaft is 11.8 kW, and 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 75mm in length and 72mm in stroke, adding up to 0.635 liters in displacement: each cylinder is roughly the size and volume of a 300ml 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.
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