Figure 3-16.--Cylinder block and components.
core hole plugs (freeze plugs). These plugs are of two
The water jacket is accessible through holes
types: cup and disc. Figure 3-17 shows typical
machined in the head and block to allow removal of the
installation of these plugs.
material used for the casting of the cylinder block.
These holes are called "core holes" and are sealed by
Figure 3-17.--Core hole plugs installed in cylinder block.