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 TM 55-1905-221-14-3
6-27.1.
PISTON - MAINTENANCE INSTRUCTION ( Continued)
LOCATION/ITEM
ACTION
REMARKS
REASSEMBLY (Cont)
taken at room tempera-
ture (70 or [21 C]).
F
The taper and out-of-
round measured from a
point 1.88 inch (4.78
cm) from the top of
the piston to the
bottom of the piston
must not exceed .0005
inch (0.0013 cm).
Refer to table below
for piston diameter
specifications.
ENGINE PARTS
MINIMUM
MAXIMUM
LIMITS
(Standard Size, New)
(inches)
(cm)
(inches)
(cm)
(inches)
(cm)
Piston:
Height (centerline of
bushing to top) .............
3.5430
8.9992
3.5480
9.0119
Diameter (above compres-
sion rings) ................... .
4.2225
10.7252
4.2255
10.7328
Diameter (at skirt) ...............
4.2428
10.7767
4.2450
10.7823
Clearance--piston skirt-
to-liner ... ......................
.0045
.0114
.0083
.0211
.0120
.0305
Out-of-round .......................
.0005
.0013
Taper ................................ ..
.0005
.0013
Compression rings:
Gap (top-fire ring) ..............
0230
.0584
.0380
.0965
.0600
.1524
Gap (No. 2, 3 and 4) .........
.0180
.0457
.0430
.1092
.0600
.1524
Clearance--ring-to-groove:
No. 1 (top-fire
ring) ...................... .
.0040
.0102
.0060
.0152
.0180
.0457
No. 2 .... .................... ..
.0100
.0254
.0130
.0330
.0220
.0559
No. 3 and 4 .................
.0040
.0102
.0070
.0178
.0130
.0330
Oil control rings:
Gap .. ................................ .
.0080
.0203
.0230
.0584
.0430
.1092
Clearance ..........................
.0015
.0038
.0055
.0140
.0080
.0203
6-429
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