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TM 5-4320-306-24
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
thicknesses 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
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