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TM 10-4320-351-14
6.4.5 Check Cylinder. (Refer to figure 6-27.)
This procedure applies to either cylinder.
This task consists of:
a. Installation
INITIAL SET-UP:
Tools:
Materials/Parts Required:
Caliper, Vernier
Solvent, Dry Cleaning, SD (P-D-680)
(Appendix B, Section III, Item 3)
(Appendix F, Section II, Item 2)
Honing Kit, Cylinder
(Appendix B, Section III, Item 3)
Chemical and Oil Protective Gloves
(Appendix B, Section III, Item 2)
Goggles (Appendix B, Section III, Item 2)
General Safety Requirements:
Equipment Condition:
Cylinder head and cylinder removed (para. 6.3.11)
WARNING
Dry cleaning solvent is toxic and flammable. Wear
Protective goggles and gloves. Use only in well
Ventilated area. Avoid contact with skin, eyes and
clothes. Do no breathe vapors. Do not use near
open flame.
a.
Check cylinder bore (1) for taper and out-of-round.
(1)
Cylinder bore is checked for taper by measuring at bottom of finned area (2), middle of finned area (3) and
top of finned area (4). Maximum difference between bottom of finned area and top of finned area is 0.002
in. (0.05mm). Measure middle of finned area approximately midway between bottom of finned area and
top of finned area. Measure for out-of-round by measuring diameter of cylinder bore and then measuring
again at 90° from first measurement. The two measurements must be within 0.002 in. (0.05 mm).
b.
Inspect cylinder (5) for a ridge at top of finned area. A pronounced ridge is cause for replacement.
NOTE
Failure to properly hone cylinder can cause early failure and excessive oil
consumption. Crosshatch pattern generally indicates proper honing.
c.
Using a honing unit and 80 to 100 grit honing stones, hone cylinder wall to develop a 90° to 1200 cross hatch
pattern.
6-44
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