Piston ring installation is one of
several critical operations performed during an engine overhaul
or rebuild. When installing the rings on the pistons, damage
can be caused without the operators knowledge that will
cause early engine failure.
It is important to use proper ring
installation tools and to exercise care when opening the ring
to put it on the piston. If the points of the ring are not
kept on line with each other the ring will be bent or otherwise
distorted. In order to perform properly, a compression ring
must seal not only an its O.D. face but on its side faces.
If the ring is bent it offers a leakage path for both blow-by
The photograph shows a ring that was
bent during installation and ran in the engine. Note the disruption
in side wear pattern.