Figure 1.23: Common types of oil control rings
All oil rings are slotted and have scraping edges designed to scrape the surplus oil from the cylinder walls. The oil between scrapers passes through slots in the ring on through slots or drilled holes in the bottom of the ring groove. From there the oil drips down into the crankcase area (Figure 1.24).
Figure 1.24: Action of oil ring as it travels down cylinder well
1.3.2.6. Crankshaft As combustion pressure is applied to the piston, it moves up and down inside the cylinder. This up-and-down motion or reciprocating motion is changed to rotary motion by means of the crankshaft and connecting rods. In other words, the downward power thrusts when act on the pistons are converted to engine torque by the crankshaft. 21