Verbal' 'Notes et croquis à l'intention des mécaniciens de marine : un manuel d'exercice du génie, destiné à l'utilisation d'officiers du génie naval et mercantile de toutes qualités, et les étudiants, et est spécialement préparé pour l'utilisation d'officiers du génie de la préparation pour les examens de compétence à la maison ou à l'étranger . ou course du cycle. Soupape d'admission de carburant et Cam.-comme l'indique l'illustration,lorsque le nez de la came est en contact avec le levier du robinet Combusiion 62 moteurs internes ce dernier est forcé outweirds, et la vanne est ouverte à l'encontre de l'un ressort qui conserve normalement

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"Verbal" notes and sketches for marine engineers : a manual of marine engineering practice, intended for the use of naval and mercantile engineer officers of all grades, and students, and is specially compiled for the use of engineer officers preparing for examinations of competency at home or abroad . or power stroke ofthe cycle. Fuel Inlet Valve and Cam.—As will be seen from the illustration, when the nose of the cam comes in contact with the valve lever Internal Combusiion Engines 62 the latter is forced outweirds, and the valve is opened against thepressure of a spring which normally keeps the valve tight in its seat.The starting handle when horizontal causes the starting valve leverto come in contact with the nose of its cam as the cam shaftrotates, while the fuel-valve lever is held clear of its cam at the sametime. With the starting handle in the vertical position the startingalve lever is clear of its cam while the fuel-valve lever then comesinto operation. The actual opening allowed the fuel valve is verysmall, as the limited opening area increases the spraying action ofthe oil injection. The air admission valve, exhaust valve, and startingvalve all open downwards or into the cylinder but the fuel valveopens upwards or out of the cylinder, as shown by the varioussketches.. thus No. 27.—Air Inlet Valve, Lever, and Cam.In the four-cycle type the cylinder cover contains four valves, Air Inlet Valve. Fuel Valve. Exhaust Valve. Starting Valve (air blast). In the two-cycle type scavenge valves, one or two in number, take the place of the air inlet valve and act similarly, with thedifference that the air is in this case under pressure when admittedto the cylinder, and is intended to scavenge the cylinder of theexhaust gases before compression of the pure air. 624 Verbal Notes and Sketches DIESEL ENGINE NOTES AND SKETCHES.Action of 4-Stroke Diesel Engine. 1. Down-Stroke.—AtmospbcMJc air at engine-room temperature is drawn into the cylinder through the suction

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