Figure 3-32.Types of piston rings.
The four-ring piston has three compression rings
The four-ring piston has two compression rings
from the top, followed by one oil control ring.
from the top, followed by two oil control rings.
Commonly used on diesel engines because they
The bottom oil control ring may be located above
are more prone to blow-by. This is due to the
much higher pressures generated during the
or below the piston pin. This is not very common
in current engine design.
Figure 3-33.Configurations of piston rings.