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chain driven camshafts cam lobe cam chain slipper pivot bolt camshaft driven gear chain slipper drive gear SOHC single over head cam the drive gear is always 1/2 the diameter and 1/2 the number of teeth of the camshaft driven gear because the camshaft must turn at 1/2 the speed of the crankshaft cam chain tensioner a spring loaded one way plunger pushes against the chain slipper the plunger is free to move outward under spring pressure but cannot return unless the cap is removed and the mechanism is released the purpose of the cam chain tensioner is to keep the chain taught and adjust as the chain wears slightly and stretches over time plunger camshaft rocker arm valve clearance adjuster SOHC user rocker arms to activate the valves