ARMY TM 9-2815-254-24
AIR FORCE TO 38G1-94-2
3-28.2. Disassembly.
a
Clamp piston connecting rod (14, FIGURE 3-77) in a softjawed vise.
Do not attempt to use some other tool to remove piston rings. Piston
ring stretching will result in reduced piston ring tension.
b.
Use a piston ring expander to remove four piston rings (11) from piston (5).
c.
Remove two retainer rings (12) from piston pin (13).
N O T E
If piston and piston pin are to be reused, tag each piston and pin with
cylinder number from which it was removed.
d.
Using a hammer and a brass bar, tap piston pin (13) from piston (5)
e.
Remove deflector (15) from crankshaft.
f.
Using gear puller, remove crankshaft gear (16) from crankshaft. Remove key (17).
3-28.3. Inspect and Measure
3-28.3.1.
Piston and Connecting Rod.
a.
Check piston ring and piston ring groove clearance as follows:
(1) Using a feeler gage, measure the clearance between piston ring and piston ring groove at several points
around the piston, refer to FIGURE 3-80.
(2) Standard clearance for the three compression rings is 0.0017 to 0.0027 in. (0.045 to 0.070 mm). Standard
clearance for the oil ring is 0.0008 to 0.0021 in. (0.020 to 0.055 mm). The limit for clearance is 0.0059
in. (0.15 mm)
(3) If clearance exceeds limit, replace piston rings.
3-131
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