TM 10-4320-309-14
TM 4320-14/1
Figure 5-33. Measuring Point of Piston Pin
g..
Check that the OD of the piston pin is greater than 0.745 inch (18.92 mm). Replace piston pin if OD is
worn beyond the wear limit.
Table 5-1 Piston Ring Wear Limits
Item
Dimension
2nd Ring
Oil Ring
1st Ring
T
B
T
B
T
B
Wear Limit
0.099 inch (2.52 mm)
0.054 inch (1.36 mm)
0.101 inch (2.57 mm)
0.054 inch (1.36 mm)
Not applicable
0.132 inch (3.36 mm)
*Refer to Figure 5-34 for definition of
dimensions T and B.
Figure 5-34. Piston Ring Dimensions
h.
Measure the thickness (dimension B) and the width (dimension T) of each piston ring. Replace piston
ring if it is worn beyond the wear limits shown in Table 5-1
Table 5-2 Maximum Side Clearance
Item
1st Ring
2nd Ring
Oil Ring
Figure 5-35. Piston Ring Side Clearance
i.
Insert each piston ring into the corresponding piston ring groove and measure the side clearance (dis-
tance between piston groove side wall and piston ring). Replace piston ring if side clearance exceeds
the wear limit shown in Table 5-2
Clearance
0.006 inch
(0.15 mm)
0.006 inch
(0.15 mm)
0.066 inch
(0.15 mm)
5-36
