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3.17.12 PISTON: APPLICATION OF
PISTON RINGS AND OIL-
SCRAPER RINGS
Oil the ring seats abundantly and apply the
central oil-scraper ring in the lower seat of the
piston
1
paying close attention that the two
ends face one another but do NOT overlap.
The two ends must be aligned in axis with the
pin bolt.
Apply the two lower
2
and upper oil-scraper
rings
3
and then the compression ring
4
.
The two oil-scraper rings must be placed so
that their openings face the higher segment of
the skirt and at 180° between them. Assembly
of the compression ring
4
must be done kee-
ping the reference (letter or number) facing
upwards and the opening must face the some
way as the opening of the lower oil-scraper
ring
2
.
1
4
3
1
2
Application of central oil-
scraper band.
Detail of positioning of two edges.
Application of piston rings.