TM 5-3805-261-34
ENGINE MAINTENANCE. (cont)
13-8.
Piston and Connecting Rod. (Sheet 7 of 12)
INSPECTION (cont)
5.
Using feeler gage, measure
clearance between pin (7) and
bearing (9). Clearance between
new parts should be .0003 to
.0013 inch. Maximum clearance
permissible for worn parts should
not exceed .002 inch.
6.
Inspect top ring and second ring
piston grooves for burrs and
wear. Oil holes should be open.
7.
Using piston ring groove gage
(Figure 13-45), measure side
clearances. Put pin end of
number 2 gage in ring groove at
four places around the piston.
Check both grooves. Piston is
reusable if there is clearance
between flat edge of gage and
piston. Both grooves must be
good to reuse piston. Replace
piston if flat edge of groove
gage is in contact with piston at
any test point.
8.
Using a micrometer, measure
outside diameter of pin (7,
Figure 13-44). Correct dimension
is 1.6998 inches. Replace if
reading is not correct.
9.
Inspect retaining rings (6).
Replace if damaged or if
resiliency is lost.
10. Remove and inspect nuts (1) and
bolts (10). Replace if cracked,
broken, distorted or threads
damaged.
Go to Sheet 8
13-46
Figure 13-44.
Figure 13-45.
