The Cylinder Head

Note:  This content is directly from our Road Machines Educational CD, available for purchase and download instantly in our store.

General

The cylinder head (2) is the structure bolted to the top of the cylinder block. The design varies according to engine type. In all cases, it serves as a mount for the valve train, intake manifold and exhaust manifold.

Valve Cover:

The valve cover (1) is designed to protect the valve train components, contain spray from valve lubricant, and prevent toxic gases from escaping into the atmosphere (toxic gases are drawn out of the valve cover and placed back into the combustion cycle.)

Cylinder Head Construction:

The cylinder head (2) is usually made of cast iron or aluminum. It is bolted to the deck (3) of the cylinder block, forming a tight seal for the combustion chamber. Channels (6) allow coolant to carry away heat from areas of high temperature. Mounting points for the spark plug (7) and valve train assembly are integral parts of the cylinder head's design, as are the intake ports (5) and exhaust ports (4).