Exam 18: Engine Upper End

While discussing intake seals, Technician A says that a faulty intake valve seal will allow oil to be pulled into the cylinder from the low pressure created during the intake stroke. Technician B says that a leaking intake seal can cause carbon buildup on the valve stem, which interferes with engine breathing. Who is correct?

On overhead cam engines, the part that rides on the cam lobe is called a(n) ____________________.

The intake valve is usually 35%-40% smaller than the exhaust valve.

Integral valve seats on cast iron heads manufactured mostly after 1970 were induction hardened to reduce valve seat wear.

Camshafts on many OHC engines are driven by a cogged belt drive, called a(n) ____________________.