TM 5-2420-230-24-2
Piston Rings (001-047)
B3.9 and B5.9 Series Engines
Page 1-88
Section 1 - Cylinder Block - Group 01
Position each ring in the cylinder 89 mm [3.5 in] below the
top deck (A), and use a piston to square it with the bore.
Use a feeler gauge to measure the gap.
Ring Gap
mm
in
Top
0.40
MIN
0.0157
0.70
MAX
0.0275
Intermediate
0.25
MIN
0.0100
0.55
MAX
0.0216
Oil Control
0.25
MIN
0.0100
0.55
MAX
0.0216
Identify the ring sets for installation in the cylinder where
the end gap was measured.
Install (001-047-026)
CAUTION
If a ring expander tool is being used, be careful not to
over expand the ring.
The top surface of the top and intermediate rings are iden-
tified as illustrated.
The oil control ring can be assembled with either side up.
L-766