TM 5-4320-302-14
6-8. CYLINDER HEAD ASSEMBLY,R OCKER ARMS, AND TAPPETS (CONT)
Location/Item
Action
Remarks
12.
Crankshaft
Rotate two complete revolutions of 360 degrees.
13.
Cylinder head
Remove waisted bolts and washers. Mark and re-
move cylinder head(s) and intermediate rings.
14.
Lead wire
Remove and measure thickness with micrometer
at thinnest point. Thickness should be 0.0394 to
0.0472 inch (1.0 to 1.2 mm). The measured
thickness or piston top clearance should be com-
pared to the specified limits. If measurement is
outside limits, piston to clearance may be ad-
justed using the following procedure. If measure-
ment is within limits, proceed to assembly.
THICKNESS (PISTON TOP CLEARANCE) SHOULD
BE 0.0394 to 0.0472 INCH (1.0 to 1.2 mm).
ADJUSTMENT
15.
Cylinder
a.
Piston top clearance may be increased or de-
shims
creased by adding or removing shims. Shims
are available in two thicknesses: 0.0079 inch
(0.2 mm) or 0.0197 inch (0.5 mm).
b.
If piston top clearance is below 0.0394 inch
(1.0 mm), remove cylinder and add appropri-
ate number of shims. Use thicker shims rather
than thinner shims whenever possible.
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