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TM 5-4210-229-14&P
6-6.
CYLINDER HEAD AND VALVES MAINTENANCE (Continued)
b
Valve removal.
Keep valves in order so reinstallation in
original valve guide is assured.
(1) Compress valve springs (3) using a spring
compressor tool.
(2) Remove spring retainer locks (4).
(3) Remove rotators (5) and oil shields (6).
(4) Allow valve (7) and valve seat (8) to drop out of
guide.
NOTE
If valve does not dropout, inspect valve stem
for burrs. If burr exists, remove with a hone to
prevent valve guide damage.
INSPECTION
a.
Cylinder head inspection.
(1) Remove deposits from upper and lower deck of
head. Pay special attention to exhaust valve
ports, valve seats, injection nozzle sleeves and
water directors.
Cleaning solvent (Appendix D, Item 54) is both
toxic and flammable. Keep off skin. Use only in
a well-ventilated area and avoid prolonged
breathing of vapors. Keep away from open
flames.
(a)
Use cleaning solvent (Appendix D, Item
54)and brass wire brush (Appendix D, Item 7)
to clean bores.
Compressed air used for cleaning or drying can
create airborne particles that may enter the eyes.
Pressure shall not exceed 30 psi 206 kPa).
Wearing of goggles is required to avoid injury to
personnel.
(b) Blow out carbon deposits with compressed air
after cleaning.
(2)
Visually inspect head for cracks using spraying
methods. If cracks are found, replace cylinder
head.
6-6
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