TM 9-6115-664-13&P
5-15. CYLINDER, PISTON, AND CRANKSHAFT MAINTENANCE
21.
Measure clearance between wall of piston groove and middle piston ring. Replace ring set if clearance is greater
than 0.031 mm (0.0012 in.).
22.
Measure clearance between wall of piston groove and bottom piston ring (oil control). Replace ring set if clearance
is greater than 0.031 mm (0.0012 in.).
C.
REPAIR.
1.
Replace connecting rod bushing (10) as follows:
a.
Using an arbor press, press bushing from connecting rod.
b.
Ensure that the bore of connecting rod and replacement bushing are clean.
c.
Align replacement bushing with rod bore, ensuring that the oil hole in the bushing is in line with the oil passage in
the top of the connecting rod. Using an arbor press, install the bushing until it is flush with the face of the
connecting rod.
2.
Replace piston ring set as follows:
a.
Using a piston ring expander, remove and discard the piston rings.
NOTE
Ensure that piston rings are installed with markings facing top of piston.
b.
Using a piston ring expander, install the oil control ring in the bottom groove of the piston.
c.
Install the middle ring in the middle groove of the piston. Install the compression ring in the top groove of the
piston.
d.
Stagger the position of the rings so that the ring end gaps are 120 degrees apart.
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