Valve Mechanism; Rocker And Bracket Assembly, Camshaft, Rocker Case And Cylinder Head Gasket - Mitsubishi 6M60-TL Service Manual

STRUCTURE AND OPERATION
2. Rocker and Bracket Assembly, Camshaft, Rocker Case and Cylinder Head Gas-
ket

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.
11-4
• The camshaft is directly supported at
its journals by the rocker case, and is
held in place from above by the rocker
and bracket assembly.
• The camshaft journals are directly
supported by the rocker case and the
rocker and bracket assembly, without
using any camshaft bearings. The
rocker case and brackets have been
machined together, meaning that they
all need to be replaced with a new set
when one of them becomes defective.