| | the last few years there has been more and more interest in quieter running ... be helpful. This explanation mostly applies to H/D type four lobe cams. Whenever ... the roller follower on a cam lobe passes the maximum lift point ... the forces on the cam drive gear teeth change direction. If more than .002 inches (. ... 005mm) backlash is present between a cam gear and a pinion gear, the ... directional change of force will result in an audible " ... click" as the backlash moves from the back side ... of each gear tooth to the front side. While some positive ... backlash is necessary to prevent localized gear tooth overloads ...
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