PISTON AND PISTON RINGS
OIL CONTROL RINGS
Install the oil control rings as follows:
Install the ring expanders in the oil control ring grooves in the piston.
When installing the oil control rings, use care to prevent over- lapping the ends of
the ring expanders. An overlapped ex- pander will cause the oil ring to protrude
beyond allowable limits and will result in break- age when the piston is inserted in
the ring compressor during installation in the cylinder liner. Do not cut or grind the
ends of the expanders to prevent overlapping. Cutting or grinding the ends will
decrease the expanding force on the oil control rings and result in high- lubricating
The scraper edges of all oil control rings must face downward (toward the bottom
of the piston) for proper oil control.
Install the upper and lower halves of both oil control rings (naturally aspirated and turbocharged
engines) as outlined above.
If there is a noticeable resistance during installation of the piston, check for an
overlapped ring expander.