11-4
2. Rocker and Shaft, Camshaft, Rocker Case and Cylinder Head Gasket
• The camshaft journals are directly
supported by the rocker case and the
camshaft cap, without using any cam-
shaft bearings. The rocker case and
camshaft caps have been machined
together, meaning that they all need to
be replaced for a new set when one of
them becomes defective.
3. Valve Mechanism
• Each valve has a valve stem seal, which regulates the flow of lubricating oil to the contact surface between the
valve and the valve guide.
• The valve springs have a variable pitch to prevent abnormal vibration at high engine speed. The exhaust valves
use a double spring, with the inner and outer springs coiled in different directions to prevent them from jamming
each other.
STRUCTURE AND OPERATION
To Next Page
Loading...
