![yanmar 2gm cooling system yanmar 2gm cooling system](https://www.agrilineproducts.com/media/catalog/product/cache/43965a316edb1fabf9e12fb5538f98e8/8/0/80391_1.jpg)
In colder waters, boats are far less likely to meet such problems. In extremes, it is possible for the rubber exhaust hose to catch fire, the plastic silencer to melt and the head-gasket to fail. Their tentacles can be sucked into water intakes. The impeller of the seawater pump 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.Ī particularly difficult problem in tropical waters is jellyfish. The engines equipped with a fresh water cooling system have an additional heat exchanger, where heat transfer occurs between the seawater and internal freshwater. In the engines equipped with a direct 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 system series#
The 2GM20 series uses either a direct seawater cooling system, or an indirect freshwater cooling system (specified by the suffix letter F i.e.
![yanmar 2gm cooling system yanmar 2gm cooling system](https://www.maritimusboote.de/WebRoot/Store7/Shops/289397/4F5E/2872/1037/8CA6/B643/C0A8/28BE/13DA/MaritimusZweikreiskuelungYanmar2GM20_m.jpg)
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. Any slight wear on that plate reduces the pumping capacity so the temperature alarm can come on when the engine is warm at low revs.It is a four-stroke, vertical, water-cooled diesel engine. I did resurface the removeable plate in the water pump as it gets scoured with the muddy East Coast water (cost a drink for the lathe operator).
![yanmar 2gm cooling system yanmar 2gm cooling system](https://saltwaterdiesels.com/wp-content/uploads/2020/03/2GM-Anode-locations.png)
I had a 1994 Yanmar 2GM20 until last year, when I sold the boat, and it had no problems of any kind. Good luck, I know how exciting it is getting a new boat but it is worth checking out the engine properly. Maybe it will help you to avoid a similar senario. If you look at Slowboat posting on East Coast forum link follows It is an old engine (original Merc.) and has performed for 18 months with no problem including North Sea crossing. Engineer insisted that ther most reliable test was to launch the boat and it was then run up and down the river for an hour with it being run flat out for a time against the tide. Mate bought a Westerly Discus recently and had a local (Ipswich) engineer to look at the engine. If the yard have serviced the engine I would want someone else to advise me on it's condition.