Technician A says that it is necessary to keep flat tappets in order if the old cam and lifters are to be used again. Technician B says that used roller tappets should not be installed on a new camshaft. Who is right?
A)Technician A only
B)Technician B only
C)Both A and B
D)Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct, as flat tappets can develop a wear pattern on the old camshaft that is matched to their shape. Therefore, they should be kept in order and returned to their original location if being reused with the old camshaft. 
Technician B is also correct, as used roller tappets can develop a wear pattern on the old camshaft that is matched to their shape. Therefore, it is recommended that new roller tappets be installed with a new camshaft to ensure proper wear and function.

Technician a Says That It Is Necessary to Keep Flat