TM 9-2320-289-34
3-13.
PISTON, CONNECTING ROD, AND CNNECTING ROD BEARING REMOVAL AND
REPAIR (Con’t).
10.
If clearance in step 9 exceeds specifications, refer to Table 3-1:
Table 3-1. Piston Diameters
Piston Type
New Pisto n Diameter
Standard . . . . . . . . . . . . . . . . . . . . . . . .3.9729 -3.9754 in.
(100,911-100.976 mm)
1st Oversize .. . . . .. . . . ... . ..0034-4.0039 in.
(101 ,687-101.700 mm)
2nd Oversize . . . . . . . . . . . . . . . . . . . . 4.0039-4.0044 in. (101.700-101.713 mm)
If a piston (8) type shown in Table 3-1 will allow cylinder bore (18) clearance of
0.0035-0.0045 in.
(0.089-0.1 14 mm)
for 6 front pistons and 0.004-0.0050 in.
(O. 112-0,127 mm) for 2 rear pistons, use that size piston for installation. It maybe necessary to
machine cylinder bore to obtain proper clearance for larger size piston.
NOTE
• If it was determined in steps 9 and 10 that a “standard” piston will be
used, perform steps 11-14. If an “oversize” piston will be used, use
appropriate oversize piston rings for installation.
• If cylinders are found to exceed specifications, It may be necessary to
machine cylinder bore to obtain proper clearance for larger size piston.
11.
Place upper compression ring (12) into cylinder bore (18) and press down about 0.25 in,
(6.5 mm) into cylinder bore. Ensure that upper compression ring is square to wall of cylinder
bore. Using feeler gage (19), measure gap between ends of upper compression ring.
C h a n g e 2 3 - 4 1
