TM 5-4320-300-14
6-10. PISTONS AND CONNECTING RODS (CONT)
Location/Item
Action
Remarks
Ring
Minimum
Maximum
Limits
inch
(mm)
inch
(mm)
inch
(mm)
Compression:
No. 1 (Top)
0.020
(0.508)
0.046
(1.168)
0.060
(1.524)
No. 2
0.020
(0.508)
0.036
(0.914)
0.060
(1.524)
Oil control (all)
0.010
(0.254)
0.025
(0.635)
0.044
(1.118)
23. Piston ring
Check side clearance of
side clear-
piston rings in grooves.
ance
Compare dimensions to
the chart below.
Ring
Minimum
Maximum
Limits
inch
(mm)
inch
(mm)
inch
(mm)
Compression:
No. 1 (Top)
0.003
(0.0762)
0.006
(0.1524)
0.010
(0.254)
No. 2
0.007
(0.1778)
0.010
(0.254)
0.014
(0.3556)
No. 3 and 4
0.005
(0.127)
0.008
(0.2032)
0.013
(0.3302)
Oil control (all)
0.0015
(0.0381)
0.0055
(0.1397)
0.008
(0.2032)
REPAIR
24. Piston
Replace piston if tin plate or ring grooves are
excessively worn or damaged, ring lands are
damaged, piston is heavily scored or cracked,
or piston shows signs of excessive overheating.
25. Cylinder
If worn or damaged, repair or replace in
liner
accordance with paragraph 6-8.
6-85
