COMBUSTOR DRAIN VALVE (Continued)
Inspect surface of valve (5) for nicks, gouges,
scores, scratches and burrs. Particular attention must
be given to sealing surface around counterbore in spring
side of valve.
2. Check for blockage of six holes in valve. Holes
which are blocked, may be cleared by passing a No. 58
drill (0.042 inch) through by hand.
Check for blockage in valve body (2). Clear any
blockage with clean, filtered, dehydrated compressed
4. Check large bore of valve body for surface defects,
especially on sealing surface of projection.
5. Check spring (6) for distortion. Spring must pass
freely over a 0.530 inch dia gage rod and through a
0.600 inch gage tube. Reject spring if distorted.
6. Check compression loading of spring. Load
required to compress spring to 0.250 inch length should
be 4 oz. to 8 oz. Reject spring if not within limits.
Examine spring for uniformity of coil spacing and
insure that surfaces are free from pits, scratches, nicks
and other defects, which may be detrimental to the
fatigue resistance of the spring.
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