TM 9-2815-225-34&P
3-51. AIR COMPRESSOR REPAIR (Contd)
LOCATION/ITEM
ACTION
REMARKS
c. Inspection and Repair (Contd)
40.
Piston pin (31)
Using suitable micrometer,
Discard if not within limits measure
outside diameter.
shown below.
New Minimum .......................................................... 0.6875 in. (17.4625 mm)
New Maximum ........................................................... 0.6876 in. (17.465 mm)
Wear Limit .............................................................. 0.6872 in. (17.4549 mm)
41.
Piston (29)
a. Inspect for scoring, cracks,
Discard if damaged or worn.
wear, and other damage.
b. Using suitable micrometer,
Discard if not within limits
measure outside diameter 1 in.
shown below at 70F (21C).
(25.4 mm) below and at a right
angle to pin bore.
New Minimum .............................................................. 3.619 in. (91.923 mm)
New Maximum ............................................................. 3.620 in. (91.948 mm)
Wear Limit ............................................................... 3.6165 in. (91.8591 mm)
c. Using suitable micrometer,
Discard if not within limits
measure pin bore.
shown below at 70F (21C).
New Minimum .......................................................... 0.6880 in. (17.4752 mm)
New Maximum ......................................................... 0.6885 in. (17.4879 mm)
Wear Limit .............................................................. 0.6890 in. (17.5006 mm)
d. Check ring grooves as follows:
(1) Install new rings (26), (27),
and (28) on piston ring grooves.
(2) Insert a 0.004 in. (0.1016 mm)
feeler gauge between ring and
ring groove.
(3) Compress ring into ring
Discard piston (29) if ring goes
groove.
below piston land surface with
feeler gauge in place.
e. Check piston ring end gap as
follows:
(1) Install new rings (26), (27),
Use piston head to seat rings
and (28) on cylinder bore of
squarely on an unworn portion
housing (37).
of cylinder bore. Repeat this
step until all three rings have
been installed.
(2) Measure piston ring end
Discard any ring with gap not
gap with feeler gauge.
within 0.010-0.020 in.
(0.254-0.508 mm).
3-328
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