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 TM 10-3930-660-24-2
PISTONS, PISTON PINS AND RINGS MAINTENANCE - CONTINUED
0276 00
INSTALLATION
1.
Install retaining ring (5) into groove on side of piston (3) marked front.
2.
Lubricate piston pin (2) and pin bore (13) with clean lubricating oil.
5
13
1
3
2
409-949
409-988
3.
Position word "FRONT" on top of piston (3) and number on connecting rod (4) as shown, and then install piston pin (2).
4.
Install second retaining ring (1).
5.
Place each new piston ring (6 thru 8), individually, into cylinders to a depth of 3.5 in. (88.9 mm) and square ring in bore
using piston as shown.
3
6,7,8
409-989
4
409-969
6.
Measure and record new piston ring gaps while rings are in cylinders. Gaps should be as follows:
a.
Top ring gap - 0.0160 to 0.0275 in. (0.4064 mm to 0.6985 mm).
b.
Intermediate ring gap - 0.0100 to 0.0215 in. (0.254 to 0.5461 mm).
c.
Oil control ring gap - 0.0100 to 0.0215 in. (0.254 to 0.5461 mm).
7.
If gaps are excessive, select next oversized piston 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 specification.
0276 00-4
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