Belt Drive Sprockets are designed for all load drive applications. These are linked by a continuous neoprene belt. The belt has square shaped internal teeth. This drive configuration is limited to overhead camshaft engines. The camshaft and the crankshaft are always remain in the relative position to each other. A spring between the plunger and the lifter body pushes the plunger upto eliminate the clearance. The lifter's oil feed hole moves away from the oil feed in the lifter bore. Then no new oil can enter the lifter and the preassure on the plunger pushes it down in the lifter. A noise will be heared from the engine if a hydraliuc lifter is not able to leak down.