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Page Title: PISTONS, PISTON PINS, AND RINGS REPLACEMENT - continued
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TM 10-3930-673-34
3-16. PISTONS, PISTON PINS, AND RINGS REPLACEMENT (CONT)
(6)
Measure and record piston ring gaps
while rings are in cylinders. Gaps
should be as follows:
Piston Ring Gaps
Top ring gap
0.0160 - 0.0275 in.
(0.41 - 0.70 mm)
Intermediate
0.0100 - 0.0215 in.
ring gap
(0.25 - 0.55 mm)
Oil control
0.0100 - 0.0215 in.
ring gap
(0.25 - 0.55 mm)
TR01070
(7)
If gaps are excessive, select next
oversized ring set.
(8)
If gaps are too close, and new piston
sleeves have been installed, bore out
piston sleeves as necessary to allow
gaps to open up to specifications.
(9)
Install oil control ring expander (8)
and piston rings (5, 6, and 7) on
piston (2).
(a)
Place oil control ring expander (8) in
bottom groove of piston (2).
TR01071
(b)
Install oil control ring (7) over
expander (8), with gap at a point
120 from gap in expander.
(c)
Install intermediate ring (6), placing its gap at a point 120 from gap in oil control ring (7).
(d)
Install top ring (5), placing its gap at a point 120 from gap in intermediate ring (6).
NOTE
Follow-on Maintenance: Install pistons and connecting rods (Para 3-17).
END OF TASK
3-110

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