TM 9-2815-225-34&P
3-39. PISTON, CONNECTING ROD, AND BEARING REPAIR (Contd)
LOCATION/ITEM
ACTION
REMARKS
c. Inspection (Contd)
12. Two rod screws (8)
a. Inspect for distorted threads.
Discard if threads are distorted.
b. Using suitable micrometer,
Discard if less than wear limit
measure smallest diameter.
shown below:
Thread O.D. Wear Limit ............ 0.540 in. Pilot O.D. Wear Limit ........ 0.6242 in.
.................................................. (13.72 mm) .................................(15.855 mm)
(Refer to
New Minimum ............................ 0.541 in ........................................... 0.6245 in.
item 8 in
.................................................. (13.74 mm) .................................(15.862 mm)
figure.)
New Maximum .......................... 0.545 in ........................................... 0.6250 in.
.................................................. (13.84 mm) .................................(15.875 mm)
13. Connecting rod (5)
Using suitable micrometer,
Discard connecting rod assembly
measure pilot bore of holes
(4) if pilot bore is more than
for rod screws (8).
0.6252 in. (15.880 mm).
NOTE
See Appendix F for screw pilot outside diameter.
14. Connecting rod cap (7)
Using suitable micrometer,
Discard connecting rod assembly
measure pilot bore of holes
(4) if pilot bore is more than
for rod screws (8).
0.6252 in. (15.880 mm).
15. Two connecting rod
a. Inspect for cracking and
Remove and discard if cracked or
dowels (6)
bending.
bent. Install new connecting rod
dowels (6) if needed.
b. Using suitable micrometer,
Remove and discard if less than
measure diameter.
0.3127 in. (7.943 mm). Install new
connecting rod dowels (6)
if needed.
c. Using suitable micrometer,
Remove and discard if not within
measure protrusion.
limits shown below. Install new
connecting rod dowels (6) if
needed.
New Minimum ................................................................ 0.220 in. (5.588 mm)
New Maximum .................................................................. 0.250 in. (6.35 mm)
16. Connecting rod (5)
Using suitable micrometer,
Discard connecting rod assembly
measure diameter of dowel
(4) if not within limits shown
holes (11).
below:
New Minimum .............................................................. 0.3128 in. (7.946 mm)
New Maximum ............................................................... 0.3133 in. (7.957 am)
17. Rod bushing (9)
a. Inspect for nicks, gouges, and
Remove and discard if nicked,
scoring.
gouged or scored. Install new rod
bushing (9) if needed.
b. Using suitable micrometer,
Remove and discard if less than
measure inside diameter.
wear limit shown below. Install
new rod bushing (9) if needed.
Wear Limit ................................................................. 2.0022 in. (50.856 mm)
New Minimum ............................................................ 2.0010 in. (50.825 mm)
New Maximum ............................................................ 2.0015 in. (50.838 mm)
18. Connecting rod (5)
a. Assemble.
Ensure connecting rod dowels
and connecting rod cap (7)
(6) fit into dowel holes (11) in
connecting rod (5).
b. Secure with two rod
Alternately tighten screws (8)
stews (8).
In order aid sequence shown in
illustration.
3-182
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