While two technicians are examining a piston crown that has vertical cracks through the edges of the piston's combustion chamber bowl, Technician A suggests the piston crown was not getting properly cooled due to low mass airflow in the combustion chamber during the valve overlap period. Technician B suggests the cracks were caused by inadequate cooling by the oil cooler nozzles. Who is correct?
A)Technician A
B)Technician B
C)Both A and B
D)Neither A nor B

Question

Quizplus · Accepted Answer

Technician A is correct because the vertical cracks through the edges of the piston's combustion chamber bowl are most likely caused by insufficient cooling of the piston crown due to low mass airflow in the combustion chamber during the valve overlap period.

While Two Technicians Are Examining a Piston Crown That Has