Lesson 1/Learning Event 1
A metal or a metal-asbestos gasket is used between the head and the block to prevent the leakage of coolant
and cylinder pressure. Holes are cut in the gasket that align with the cylinders, bolt holes, and coolant passages.
I- and F-head engine cylinder heads have valves and valve operating mechanisms mounted on them. These
heads also have passages so lubricating oil can flow between the crankcase and the valve mechanism. A rocker
armor valve cover is bolted to the top of the cylinder head. This prevents the leakage of oil and keeps dirt out
of the valve mechanism.