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TM 5-4320-305-24
3-19.
REPLACE CYLINDER HEAD ASSEMBLY, ROCKER ARMS, PUSHRODS, AND TAPPETS (Continued)
7
Remove lead wire (1) and measure thickness with
micrometer (9) at thinnest point (10). Thickness
should be 0.0394 to 0.0472 inch (1.0 to 1.2 mm). The
measured thickness or piston top clearance should be
compared to the specified limits. If measurement is
outside limits, piston top clearance may be adjusted
using the following procedure. If measurement is
within limits, proceed to INSTALLATION.
ADJUSTMENT:
1
Piston top clearance may be increased or decreased
by adding or removing shims (1). Shims are available
in two thickness’: 0.0079 inch (0.2 mm) or 0.0197
inch (0.5 mm).
2
If piston top clearance is below 0.0394 inch (1.0 mm),
remove cylinder (2) and add appropriate number of
shims (1). Use thicker shims rather than thinner
shims whenever possible.
3
If piston top clearance is greater than 0.0472 inch (1.2
mm), lift cylinder (2) up and remove appropriate
number of shims (1) with side-cutting pliers.
3-106
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