"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 . >-n i; f ^ ^ o o oj i- r 2 \. o 4-1 u 0) •a G G a (ij oU 6 o So ?M c o UJ •ao 1 i; « 4i OT M 4J U) CO Q .2 o 1 Z 1 Internal Combustion Engines 629 Wear of Valves.—The exhaust valves usually show signs ofwear first, as the intense heat of the gases produce pitting on thefaces. As leak} valves
"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 . >-n i; f ^ ^ o o oj i- r 2 \. o 4-1 u 0) •a G G a (ij oU 6 o So ?M c o UJ •ao 1 i; « 4i OT M 4J U) CO Q .2 o 1 Z 1 Internal Combustion Engines 629 Wear of Valves.—The exhaust valves usually show signs ofwear first, as the intense heat of the gases produce pitting on thefaces. As leak} valves mean loss of compression, and thereforereduced power, these valves require regular o\erhaul and fuel valve also tends to wear away at the spra\-er end, andtherefore requires to be examined and ground in at regular intervals,as any difference in setting due to pitting, etc., ma} seriousl} upsetthe timing of the oil injection, and throw the c}iinder out of j^owerbalance with the other c}-linders of the engine. Premature ignitionma} also take place. If dirt enters with the fuel oil, choking up ofthe pulveriser may also happen, resulting in falling off of power. Fuel Valve Lift.—The lift of this valve seldom exceeds ^V in.,and the period that the valve remains open is usual!}- about yV of thedown stroke. A
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Keywords: ., bookcentury1900, bookdecade1910, bookidverbalnotess, bookyear1917
