TM 1-1520-238-23
Change 2
6-183
6.37.
ENGINE NOSE GEARBOX INPUT SEAL ASSEMBLY REMOVAL/INSTALLATION – continued
6.37.4. Cleaning
a. Clean removed and attaching parts or surfaces (para 1.47).
6.37.5. Inspection
a. Check retainer for nicks, gouges, and burrs.
(1) Repair damage 0.030 INCH or less deep by blending. Use depth gage.
b. Check retainer screw thread inserts for damaged threads and looseness (TM 1-1500-204-23).
c. Check retainer and gearbox housing for elongated bolt holes. None allowed.
d. Check retainer and seal assembly for cracks. None allowed.
e. Check retainer and seal assembly for corrosion (para 1.49).
f. Check seal assembly for scratches, nicks, and gouges. Casting defects on non-mating surfaces are
permissible.
g. Check seal assembly carbon seal air gap measurement.
(1) With seal halves together, measure the gap between magnet and seal case. Measure gap four places at
90 degrees. Use gap setting gage.
(2) If less than 0.007 INCH, replace seal.
h. Check seal assembly for wear step on carbon seal mating surface (highly polished surface). None
allowed.
6.37.6. Installation
CAUTION
Do not use paper type material to clean parts.
Work area is to be clean and free from any metal chips to prevent damage to seal.
Retainer surface must be free of preservatives and oils. MIL-L-23699 oil will cause packing lubricant
to break down or packing to twist causing seal to fail.
The seal assembly is a magnetic seal. Hold case firmly to prevent faces from slamming together.
Care must be used when mating seal assembly or damage to mating surfaces may result.
New seal assemblies are to remain in packaging until ready for installation or damage to magnetic
seal will occur.
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