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TM 5-4320-304-14
TM 08922A-14/1
5-11. lNSPECT/REPLACE CYLINDER (Continued)
Measure cylinder bore at levels 1 to 4 of
engine centerline axis A and crossline axis B.
A normal or new bore diameter should be
2.8740 to 2.8774 inches (73.00 to 73.01
mm). If wear limits for a normal bore cyl-
inder have been reached or exceeded, re-
place cylinder and piston. If measurements
on axis A and axis B are different, cylinder
is out-of-round or has high spots. Replace
cylinder and piston.
4
5
Check that the top and bottom joint faces
If damaged, replace
are smooth and flat.
cylinder and piston.
REPAIR:
1
Remove slight ridges, score marks, and glaze with a hone equipped with 20-grit stones. Work hone
up and down rapidly the full length of the cylinder bore several times in a criss-cross pattern.
Criss-cross pattern produces hone marks on a 45-degree axis, which aids piston movement and
helps prevent formation of ridges.
Dry cleaning solvent P-D-680 (safety or Stoddard’s Solvent)
is potentially dangerous. Avoid repeated and prolonged
breathing of vapors and skin contact with the liquid. Do
not use near open flame, arcing equipment, or other ignition
sources. Always wear eye protection and protective cloth-
ing. The flash point of P-D-680 is 100° to 138° F (38° to
59°C).
Death or serious injury could occur if compressed air is
directed against the skin. Do not use compressed air for
cleaning or drying unless the pressure is/has been reduced
to 30 psi (2.06 bar) or less. When working with com-
pressed air, always use chip guards, eye protection, and
other personal protective equipment.
2
Clean cylinder with dry cleaning solvent and dry with compressed air. Remove any burrs.
3
Recheck cylinder bore and out-of-round on repaired cylinder as described above. Replace if out
of tolerance.
5-37
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