TM 9-6115-664-13&P
5-9. CYLINDER HEAD MAINTENANCE
B. INSPECTION.
WARNING
Cleaning
solvent,
PD-680,
is
potentially dangerous to personnel
and
property.
Skin
and
eye
protection
is
required.
Good
ventilation
is
required.
Avoid
repeated
and
pro-longed
skin
contact. Do not use near open flame
or excessive heat. Flash point is 200°
F (93.3° C).
1. Prior to inspecting, clean all parts in cleaning solvent
and allow to dry thoroughly.
2. Using a caliper, measure the ID of the rocker arm
bore (dimension A). ID shall not exceed 14.050 mm
(0.5536 in.). Replace rocker arm if worn beyond
limit.
3. Measure the OD of the rocker arm bolt (dimension
B). OD shall not be less than 13.955 mm (0.5498
in.). Replace rocker arm bolt if worn beyond limit.
4. Measure the ID of the rocker bolt bore in the cylinder
head (dimension C). ID shall not exceed 14.060 mm
(0.5540 in.). Replace cylinder head if worn beyond
limit.
5 Inspect rocker arms for cracks or scoring of the bore
surface. Inspect rocker arm bolt for scoring or other
damage. Replace damaged components.
6. Inspect push rods for straightness. Inspect for
scoring or other damaged. Replace damaged push
rods.
7. Inspect valve springs for cracks, broken sections, or
deformation. Replace if damaged or deformed.
Figure 5-3. Cylinder Head
(Sheet 3 of 7)
5-26
