Cylinder Head Assembly: Description and Operation

Hydraulic roller valve tappets, providing automatic lash adjustment, ride on camshaft lobes and transfer up and down motion to the rocker arms through push rods.
- The rocker arms are pedestal-mounted and pivot on rocker arm seats bolted to the cylinder heads.
- The valves are arranged alternately: intake valve/exhaust valve.
- Flexible fuel vehicles are equipped with unique exhaust seat inserts.