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“Preliminary examination of the engine revealed that the crankcase was breached over the No. 6 cylinder barrel,” the report said.

Chenoweth states that on later engines an oil-control ring was added on the bottom of the piston, necessitating a considerable increase in the length of the cylinder barrel.

The design of the cylinder barrel presented fairly simple problems involving not much more than those of keeping the sections as thin as possible and devising means of fastening it and of keeping the water jacket tight.

The cylinder barrel would be brought in at its head end to form a portion of the cylinder head and then extended along its axis in the form of a fairly large boss, a mating boss being provided on one side of the valve box.

This can be seen in Figure 6, where the circular flange on the valve box contacts both the crankcase and the cylinder barrel.