Cylinder Head Assembly: Description and Operation

The cylinder head is made of a cast aluminum alloy and has four in-line combustion chambers. Each combustion chamber has two intake valves and two exhaust valves.

A fuel injector is positioned near each set of intake valves. During each intake stroke of the engine, a fuel injector sprays or atomizes fuel into a fine mist. This mist mixes with air drawn in through the intake manifold as the piston reaches the bottom of the cylinder during the intake stroke.

The valve train is driven by a single overhead camshaft. The camshaft has sixteen cam lobes. Each cam lobe operates an intake or exhaust valve through a rocker arm. Valve lash can be adjusted by turning the adjusting screw on the rocker arm after loosening the locknut. This will increase or decrease clearance between rocker arm and valve stem.