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 TM 55-1905-223-24-1
(23)
Install cup plugs (FIG. 4-4).
(a) Apply cup plug loctite to the outside of the cup plug.
(b) Use expansion plug drivers and driver handle to install cup plugs.
(24)
Pressure test cylinder head.
(a) Attach cylinder head to hydrostatic tester with water test adapter plate FIG. 4-20.
(b) Apply 80 psi (552 kPa) air pressure. Check for cracks in the head and leaks at the cup plugs.
(c) Immerse the cylinder head in water. Apply 80 psi (552 kPa) air pressure. Check for leaks
(bubbles)
in the head and at the cup plugs.
FIGURE 4-20.
Hydrostatic Tester.
(d) If there is evidence of leaks at the cup plugs, remove the plug, clean the bore, and install a new
plug (refer to step b of this procedure).
(e) If there is evidence of leaks in the casting, discard the cylinder head.
NOTE
Check the marking on the center of the valve head to identify
the correct valve. Intake valves have no mark. Exhaust valves
are marked "(E)" or "' (S)".
25 Measure valve depth.
(a) Install valve in valve guide.
(b) Use gauge block to measure the depth of the valve (FIG. 4-21). Verify the valve depth is even
with no more than 0.020 inch (0.51 mm) below the surface of the head. If the valve depth is not
within specifications, replace the valve seat insert (FIG. 4-25).
4-19
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