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A Yanmar 2GM20 marine diesel engine, installed in a sailboat. The center pulley is the crankshaft, the lower left one the seawater pump, the upper right one the alternator. The Yanmar 2GM20 is a series of inboard marine diesel engines manufactured by the Japanese company Yanmar Co. Ltd. It is used in a wide range of sailboats and motorboats.
For marine application (Yanmar 4LV), the engine generates up to 250 hp (253 PS; 186 kW) at 3800 rpm. ... It has 16 valves and a DOHC (double overhead camshaft) design ...
Leakage in narrow clearance, spool valve. Hydraulic clearance. Flow in narrow clearances are of vital importance in hydraulic system component design. The flow in a narrow circular clearance of a spool valve can be calculated according to the formula below if the height is negligible compared to the width of the clearance, such as most of the clearances in hydraulic pumps, hydraulic motors ...
DOHC 4 valves x cyl. Compression ratio: 16.8:1: Combustion; Turbocharger: Single or two Variable-geometry with intercooler: Fuel system: Common rail direct injection: Fuel type: Diesel: Cooling system: Water-cooled: Output; Power output: 151–272 kW (202–365 hp; 205–370 PS) Torque output: 430–650 N⋅m (317–479 lb⋅ft) Chronology ...
Yanmar Co., Ltd. (ヤンマー株式会社, Yanmā Kabushiki-Gaisha) is a Japanese diesel engine, heavy machinery and agricultural machinery manufacturer founded in Osaka, Japan, in 1912. Yanmar manufactures and sells engines used in a wide range of applications, including seagoing vessels, pleasure boats, construction equipment, agricultural ...
cast aluminium alloy; two valves per cylinder, 10 valves total, hydraulic bucket tappets with automatic valve clearance compensation, timing belt-driven single overhead camshaft (SOHC), swirl-inducing intake ports aspiration cast aluminium alloy intake manifold, cast iron exhaust manifold (water-cooled in marine applications)
A desmodromic valve is a reciprocating engine poppet valve that is positively closed by a cam and leverage system, rather than by a more conventional spring. The valves in a typical four-stroke engine allow the air/fuel mixture into the cylinder at the beginning of the cycle and exhaust spent gases at the end of the cycle. In a conventional ...
The valve timing of a diesel engine also depends on tappet clearance of the inlet and exhaust valves. If tappet clearance is less, then valve will open early and close late. [2] If tappet clearance is more, then valve will open late and close early. Tappet clearance is measured by an instrument called feeler gauge.
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