TM 5-3810-300-24-&P-3
1.6
Piston and Piston Rings
expander are overlapped and corrective action
the bottom of the piston).
can be taken before ring breakage occurs.
NOTE: The scraping edges of all oil control
2. To install the one-piece ring (turbocharged engines),
rings must face downward (toward the
position it over the upper ring groove, using tool J 8128,
bottom of the piston) for proper oil control.
with the gap 180 from the gap in the expander and the
scraper edge facing down. Press the ring against the
3. Install the upper and lower halves of both oil control
gap side of the expander to prevent the ends of the
rings (non-turbocharged engines) as outlined above.
expander from overlapping, then align the ring with the
groove and release the tension on the tool, permitting the
NOTE: The face of the top half of the upper
ring to slip in position.
oil control ring used on 71N engines is
chrome-plated.
Install the upper and lower halves of the lower oil control
ring by hand. Install the upper half with the gap 180
If there is a noticeable resistance during installation of
from the gap in the expander. Then install the lower half
the piston, check for an overlapped ring expander.
with the gap 45 from the gap in the upper half of the ring.
Make sure the scraper edges are facing down (toward
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