TM 9-4120-385-14
H. REPAIR OF DAMAGED MACHINED AND POLISHED SURFACES.
Smooth rough spots, scores, burrs, galling, and gouges from damaged machined
1.
and polished surfaces.
The finish of the repaired part should approximate that of the original finish.
2.
In performing any of these operations, critical dimensions must not be altered.
3.
I. REMOVAL OF RUST OR CORROSION.
Completely remove corrosion from all surfaces of the part.
1.
To remove rust or corrosion, use wire brush, abrasive cloth, sand blast, vapor
2.
blast equipment, or rust remover except on highly polished surfaces.
On highly polished surfaces, buffing or the use or crocus cloth is recommended.
3.
J. TUBES AND FITTINGS.
Check tubes and fittings for cracks or splits.
1.
Check tubing for kinks.
2.
Replace damaged tubing with tubing of the same size.
3.
4.
Tubing should be bent accurately and to the correct radius using a bending tool.
Tubes should have a uniform bend without wrinkles or kinks.
5.
The flattening effect in tube bends should not exceed 10 percent of the normal
6.
tube O. D.
Tubes should be bent to correct alignment with the fitting. Incorrect alignment
7.
places the tube under mechanical stress.
Use a flaring tool to flare tubing used with flare nuts.
8.
All tubing and fittings must be completely clean on the inside prior to
9.
installation.
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