. Automotive industries . gear on the crank-shaft is of the helical type and has thirty-two teeth of10 diam. pitch, with a 22 deg. 30 min. angle of helix. Thetiming gear, which is mounted on the camshaft, has six-ty-four teeth. The crankcase is made of aluminum, its sides extend-ing down 41/4 in. below the center line of the sides are ribbed and form a bridgework. Thecylinder blocks are bolted to the crankcase by ten 7 16-in. studs each. The camshaft bearings are located di-rectly above the crankshaft bearings. A cast oil pas-sage 34 in. in diameter extends the whole length of
. Automotive industries . gear on the crank-shaft is of the helical type and has thirty-two teeth of10 diam. pitch, with a 22 deg. 30 min. angle of helix. Thetiming gear, which is mounted on the camshaft, has six-ty-four teeth. The crankcase is made of aluminum, its sides extend-ing down 41/4 in. below the center line of the sides are ribbed and form a bridgework. Thecylinder blocks are bolted to the crankcase by ten 7 16-in. studs each. The camshaft bearings are located di-rectly above the crankshaft bearings. A cast oil pas-sage 34 in. in diameter extends the whole length of thecrankcase, its function being that of an oil cooler. Themain bearings are supported by box section ribs andthe caps are bolted to the bearings by means of four7 16-in. studs. The oil pan is also of aluminum. The two water pumps are carried on the front gearcover and they are so located as to line up with the par-ticular block which they supply. They are driven atcrankshaft speed and their impellers are of the inclosed. Longitudinal section through engine and clutch March 21,, 1921 AUTOMOTIVE INDUSTRIES THE AUTOMOBILE 645 vane type which eliminate wall friction in the pumps. Oiling is by pressure feed. The oil is first strainedthrough a large, fine-mesh screen into the oil pan; fromthere it passes through the oil pump which is located inthe base of the oil pan toward the rear, and is then de-livered through a pipe in the bell housing to the top mainoil-way cast in the crankcase. Here some of the oilbranches off to the rear main bearing, while the mainstream passes along the top of the crankcase and thendown a drilled hole to the front main bearing. Here itenters the hollow crankshaft and flows along the centerof the shaft and up through the web to No. 1 it is carried through an arc-shaped pipe con-centric with the crank axis to No. 2 bearing. At No. 2bearing the smaller stream which comes in at the rearbearing is met. At the rear bearing there is a reliefvalve
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectaeronautics, bookyear
