TM 5-1940-277-34
PISTON AND CONNECTING ROD ASSEMBLY INSPECTION AND REPAIR INSTRUCTIONS
(Continued)
LOCATION
ITEM
ACTION
REMARKS
8.
Rings (9) and (10)
New rings
a.
Check each
Rings must be
ring for
checked in
specified
cylinder they
gap by:
will be used in.
Pushing ring
into bore to
lower portion.
Using piston
head (11) to
make sure ring
is square with
wall.
Using feeler
gage (15),
measure gap.
Checking against
specifications
below.
SPECIFICATION: PISTON RING GAP
Upper Compression
0.016 to 0.031 in. (0.406 to 0.787 mm)
Intermediate
0.012 to 0.029 in. (0.305 to 0.737 mm)
Lower
0.012 to 0.029 in. (0.305 to 0.737 mm)
Oil Control
0.012 to 0.029 in. (0.305 to 0.737 mm)
b.
Check ring
Use feeler
to groove
gage (15).
clearance.
SPECIFICATION: RING TO GROOVE CLEARANCE
Upper Compression
0.0025 to 0.0040 in (00.063 to 0.102 mm)
Intermediate
0.0027 to 0.0042 in (00.069 to 0.107 mm)
Lower
0.0027 to 0.0042 in (00.069 to 0.107 mm)
Oil Control
0.0025 to 0.0040 in (00.064 to 0.102 mm)
3-25
