Exam 32: Camshafts and Valve Trains

Variable cam timing technology is used on the exhaust cam only.

On a vehicle with cylinder deactivation, the valves are kept closed by deactivating the ________.

Two technicians are discussing an engine with an interference design. Technician A says if a valve remains open when its cylinder reaches TDC, the piston may strike the valve. Technician B says if a valve remains open when its cylinder reaches TDC, valvetrain damage can result. Which technician is correct?

Camshafts turn at which of these?

Hydraulic lifters or hydraulic lash adjusters (HLA) may not bleed down properly and could cause an engine miss if ________.

Technician A says that silent chains are quieter than roller chains and do not stretch with use. Technician B says that on overhead valve engines, the camshaft is usually placed in the block above the crankshaft. Who is right?

Many technicians always use new pushrods because ________.