TM 10-4320-307-24
3-36 CYLINDER HEAD ASSEMBLY/INSPECT/REPLACE (CONT).
2.
Clean and inspect the cylinder block as follows:
a.
Steam clean cylinder heads and dry with compressed air.
b.
Blow out all capscrew holes, fuel passages. and oil passages.
c.
Use gasket scraper to remove heavy dirt and debris from cylinder head gasket surface, exhaust
manifold gasket surface, and rocker housing gasket surface.
d.
Use razor blade scraper and solvent to remove any remaining material from cylinder head gasket surface,
exhaust manifold gasket surface, and rocker housing gasket surface.
e.
Clean with dry cleaning solvent and dry with compressed air.
f.
Inspect cylinder head for cracks or damage.
NOTE
If a crack in a cylinder head is suspected, notify general support maintenance
for pressure testing and repair.
g.
Inspect valves for indications of leakage or burning.
NOTE
If indications of leakage or burning are found, the valves and the seats must be resurfaced. Notify general support
maintenance for repair.
3.
Clean and inspect cylinder head capscrews as follows:
CAUTION
Do not use caustic or acid solutions to clean the cylinder head capscrews.
a.
Clean the capscrews with dry cleaning solvent.
b.
Clean capscrews thoroughly with wire brush, wire wheel (soft), or non-abrasive bead blast to remove
deposits from shank and threads.
NOTE
Do not reuse a capscrew hat has damaged threads or a reduced diameter from
been stretched.
c.
Inspect cylinder capscrews for the following:
(1)
Damaged threads.
(2)
Reduced diameter (due to capscrew stretching).
(3)
Corrosion or pitting exceeding 0.005 inch (0.12 mm) in depth.
(4)
Corrosion or pitting located within 1/8 inch (3.2 mm) of fillet or threads.
d.
Immediately after cleaning and inspecting. apply a film of clean engine lubricating oil to capscrews that are to
be used again.
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