"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
"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 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 starting\alve 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 thus No. 27.—Air Inlet Valve, Lever, and 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 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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