Technician a Rotates the Engine by Hand Until All the Cam

Multiple Choice

Technician A rotates the engine by hand until all the cam timing marks align to ensure that the cam timing was set properly. Technician B moves the belt tensioner pulley to remove its tension on the belt before removing the timing belt. Who is correct?

A) A only
B) B only
C) both A and B
D) neither A nor B