Engine Repair Work Example 9

WorkKey Level: 4
NATEF Automotive Tasks: I.B.14

The amount of wear that has taken place on a camshaft may be determined by taking two measurements of a cam lobe.  One measurement dimension A, is across the cam lobe and the other, dimension B, is across the base circle (see figure below).  The lobe lift is determined by subtracting the B measurement from the A measurement.

The cam lobe dimension A is 35.90 mm and dimension B is 29.25 mm.  What is the lobe lift?

Solution:

The lobe lift is the difference between the cam lobe dimension A and dimension B.
35.90 mm – 29.25 mm = 6.65 mm