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LIFTER AND CAM LOBE

LIFTER AND CAM LOBE. Lifter face has Convex Shape Cam Lobe has taper of .0007” to .002” Lifter must spin to Dissipate Load Lifter’s convex shape prevents Edge Loading Page 193. LIFTER AND CAM LOBE. Cam and Lifters become wear mated in first few minutes

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LIFTER AND CAM LOBE

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  1. LIFTER AND CAM LOBE • Lifter face has Convex Shape • Cam Lobe has taper of .0007” to .002” • Lifter must spin to Dissipate Load • Lifter’s convex shape prevents Edge Loading • Page 193

  2. LIFTER AND CAM LOBE • Cam and Lifters become wear mated in first few minutes • If cam is replaced replace lifters also • Used lifters will rapidly wear out a new cam

  3. LIFTER AND CAM LOBE • Lubrication and Break-in • Cam is lubed by crank spray • First 1/2 Hour is Critical • Must use (EP) Extreme Pressure Lubricant

  4. LIFTER AND CAM LOBE • Minumum RPM 1500 for 15 Minutes • Some OHV have oil passage in cam • Oil holes on each Lobe, if plugged instant cam failure. • Oil changes are importiant to cam life. • Page 194 Figure 8.21

  5. CAM LOBE SHAPE • Base circle • Lobe • Opening and Closing Flank • Opening and Closing Ramp • Page 194 Figure 8.22

  6. CAM LOBE SHAPE • Lift • Duration • Overlap • Page 195

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