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TM 5-4320-305-24
4-9. REPLACE/REPAIR CYLINDER ASSEMBLY (Continued)
REPAIR:
1 Remove slight ridges, score marks, and glaze on cylinder bore with a hone equipped with 120-grit
stones. Work hone up and down rapidly the full length of the cylinder bore several times in a
criss-cross pattern.
NOTE
Criss-cross pattern produces hone marks on a 45 degree
axis, which aids piston movement and helps prevent
formation of ridges.
WARNING
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
clothing. 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 (2.11 kgcm2) or less. When working with
compressed air always use chip guards, eye protection, and
other personal protective equipment.
2 Reclean each repaired cylinder with dry cleaning solvent and dry with compressed air. Remove any
burrs.
ADJUSTMENT:
1 Recheck cylinder bore and out-of-round on repaired cylinder as described in CLEANING/INSPECTION
step 4. Replace if necessary.
CAUTION
Piston and cylinder damage may result if pistons
are not returned to their original cylinders. Observe
matchmarks so that mixups do not occur.
2 Insert each piston (1) in its respective cylinder (2) or replacement
and measure the piston skirt-to-cylinder clearance (3) with a
feeler gage. If clearance is not within 0.0032 to 0.0166 inch
(0.81 to 0.422 mm), replace piston.
3 Install cylinder (new or replacement) in proper bore of crankcase
and measure cylinder bore and out-of-round with a bore gage at
the locations described in CLEANING/INSPECTION step 5.
Rehone or replace as needed.
4-68
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