Cylinder Head Assembly: Description and Operation

The SOHC (L24) cylinder head is aluminum and is cast using the lost foam process. The camshaft is located in the cylinder head and driven by a chain off the front crankshaft sprocket. The chain is hydraulic tensioned and has a ratchet mechanism to keep the chain tight. Motion from the camshaft is transmitted to the eight valves by hydraulic lifters and rocker arms. The valve guides are pressed in to the cylinder head and serviceable. Guides, seats and valves are used to service the cylinder head in the event of valve stem or seat wear. Only one size valve seals, seats and valves are released for service. Standard size and 0.025 mm (0.010 inch) oversize outer diameter valve guides are released for service.