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 TM 55-1905-220-14-5
3-96.1. PISTON - MAINTENANCE INSTRUCTIONS (Cont).
LOCATION
ITEM
ACTION
REMARKS
REASSEMBLY (Cont)
CAUTION
When installing the oil control rings, use care to prevent overlapping the ends of
the ring expanders. An overlapped expander will cause the oil ring to protrude
beyond allowable limits and will result in breakage 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 oil consumption.
i.
Oil
Install the upper and
Install by hand.
control
lower halfs.
Do not use tool.
rings (8)
Install the
upper half with
the gap 180
from the gap in
the expander.
Then install
the lower half
with the gap 45
from the gap in
the upper half
of the ring.
Make sure the
scraper edges
are facing down
(toward the
bottom of the
piston).
NOTES
The face of the top half of the upper oil control ring used on 71N engines is chrome-
plated.
The scraping edges of all oil control rings must face downward (toward the bottom of
the piston) for proper oil control.
If there is a noticeable resistance during installation of the piston, check for an
overlapped ring expander.
3-1644
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