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Aviation History
1918
1918 - 0075.PDF
JANUARY 17, 1918. bolts clamp each cylinder base flange at four points by the bridge pieces between each pair of cylinders. Below the crank chamber, at the rear end is situated the main oil sump, which contains the oil pump. In the front end of the base chamber casting below the carburettor. Air is led by two ventilating funnels on each side of the crankcase into two oval ports in the base chamber casting, and a number of fins are cast on the under side of the false bottom inside the base chamber for cooling purposes. The air intake to the carburettor is a large passage 4 ins. in diameter, Section thro. Pump *A* Section thro Volvt *X" 146 Fig. 17.—Sectional details of oil pump. false bottom is an auxiliary service oil sump, into which the return oil from the circulation system drains through a wire gauze filter. The central chamber of the base chamber casting between the two sumps is used as an air chamber for the dual purpose of cooling the oil and wanning the air supply to the cast in the left-hand side of the crank chamber and base, as shown in the sectional arrangement drawings of the engine. Cooling fins are also cast on the under side of the sump, and four breathers are fitted into the top half of the crank chamber between the webs of the main-bearing housings. Lubrication. Although the general lubrica- tion system of the 260 h.p. Mercedes engines is arranged on normal principles, it is necessary to deal with the various details of the somewhat complicated con- struction of the plunger type oil Fig. 18.—Sectional perspective view of oil pump. 71 Fig. 19.—Oil pulsationdamper valve.
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