TM 5-1940-322-24
0163 00
CYLINDER BLOCK MAINTENANCE (Contd)
CLEANING AND INSPECTION
1.
For general cleaning and inspection instruction, refer to WP 0013 00.
WARNING
Skysol 100 solvent is combustible; DO NOT use or store near
heat, sparks, flame, or other ignition sources. Use mechanical
ventilation whenever product is used in a confined space, heated
above ambient temperatures, or agitated. Keep container sealed
when not in use.
Contact with Skysol 100 may cause skin irritation. Use chemical-
resistant gloves. In case of skin contact, remove any contaminated
clothing and wash skin thoroughly with soap and water. Wash
contaminated clothing before reuse. Eye contact may cause
irritation, tearing, or blurring of vision. Use face shield or goggles
when eye contact may occur. In case of eye contact, flush eyes with
large amounts of water for at least 15 minutes or until irritation
subsides. Inhalation may cause irritation to upper respiratory
passages. DO NOT have food or drink in the vicinity. Failure to
comply may result in injury to personnel.
2.
Clean cylinder block (1) using wire brush and Skysol 100, dry with clean cloth, and apply light coat of
oil to all unpainted surfaces.
WARNING
Compressed air source must not exceed 30 psi (207 kPa). Wear
eyeshields when cleaning with compressed air. Failure to wear
eyeshields may result in injury to personnel.
3.
Clean all oil passages in cylinder block (1) using wire brush and Skysol 100. Blow out oil passages
with compressed air.
4.
Clean all expansion plug openings and threaded holes with Skysol 100.
5.
Inspect cylinder block (1) for cracks or damage. Replace cylinder block (1) if cracked or damaged.
6.
Measure overall flatness of cylinder block deck surface with straightedge and feeler gauge from end-
to-end and side-to-side. Flatness must not exceed 0.003 in. (0.075 mm). If deck surface is not within
limits, cylinder block deck surface must be ground/milled or cylinder block (1) replaced.
7.
Inspect cylinder block deck for any localized dips or imperfections. Cylinder block deck must be
milled/ground if dips or imperfections are present.
NOTE
Perform steps 8, 9, and 10 to check cylinder block bores. If bores are
not within limits, cylinder block can be bored out for oversize
service pistons or service cylinder liners using standard pistons.
8.
Using dial bore gauge kit, measure cylinder bore diameter at 1 in. (25.4 mm) and 6.7 in. (170.7 mm)
from top of cylinder block deck.
9.
Bore I.D. maximum is 4.0203 in. (102.116 mm).
10.
Bore out-of-round maximum is 0.0014 in. (0.035 mm).
11.
Bore taper maximum is 0.003 in. (0.076 mm).
12.
If not installed, install all crankshaft main bearing caps (2) and tighten mounting bolts (3) before
measuring main bearing bores. Maximum main bearing bore measurement is 3.272 in. (83.106 mm).
If bore is not within limits, cylinder block (1) and main bearing caps (2) must be machine line bored
for oversize bearings or cylinder block (1) must be replaced.
0163 00-4
