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TM 10-4320-343-14
6.6.5.1 Disassembly.
a.
Remove retaining rings (figure 6-16, 1) and withdraw piston pin (2) .
b.
Remove piston and rings from connecting rod (3) .
c .
Using piston-ring expander, remove trapezoidal ring (4) and two taper piston
r i n g s ( 5 ).
d.
Open and remove oil control ring (6) from piston (7).
6.6.5.2 Repair.
a.
b.
c .
d.
e .
f .
Inspect piston for damage or visible wear, including bosses.
Using
standardmeasuring
tools, refer to table 6-1 and ensure axial piston
ring clearance.
Insert all piston rings one at a time in cylinder and press down with piston
to a distance of 1.18 inches (30 mm) from cylinder head contacting surface.
Refer to table 6-1 and measure gap clearance of piston ring.
Replace defective pistons together with piston pin and rings.
Install expander spring for bevelled scraper ring in bottom groove on
piston (7) .
Using piston-ring expander, perform the following:
( 1 ) I n s t a l l o i l - c o n t r o l r i n g ( 6 ).
(2) Install two taper piston rings (5) with face marked “top” upwards.
(3) Install trapezoidal ring (4) with face marked ‘top” upwards.
g .
Install one retaining ring (1) into boss of piston.
h.
Oil piston pin (2) and piston pin bushing.
i .
Place piston on small end of connecting rod (3) so that exhaust air side of
piston (marked on piston crown) is in same direction as open side of
connecting rod bearing.
j .
Secure opposite end of piston pin (2) in position.
6.6.5.3 Assembly.
a .
Press piston pin (2) into piston bosses and small end of connecting rod (3).
b .
Install second retaining ring (1) to secure piston pin (2).
c .
Inspect cylinder liner as follows:
(1) Using inside micrometer,
gauge cylinder bore at levels 1 to 4 of engine
center line "a" as well as cross-line "b" see figure 6-16.
(2) Readings should be 3.937 inches (100 mm).
If not within plus 0.0079 inch
(0.2 mm) replace parts concerned.
d.
Check that cylinder top and bottom joint faces are flat.
Replace cylinders as
needed.
e .
Using micrometer and an internal
gauge bore of piston pin bushing
0.0035 inch (0.091 mm).
Replace
dial gauge, check diameter of piston pin and
for reading of 0.0015 inch (0.04 mm) and
piston pin bushing if required.
6-35/(6-36 blank)
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