7-4 100-214-239 Rev. A
Maintenance
Lapping Procedure
5. Holding the part to recondition, place the interface surface on the emery cloth.
Grasp the part at the lower end, with your thumb over the spanner-wrench hole,
and lap the part in a straight line across the emery cloth.
NOTE
i Do not apply downward pressure. The weight of the part alone provides suf-
ficient pressure.
6. Rotate the part 120 degrees (1/3) to the next hole.
7. Stroke the part an equal number of times at each rotation (2 or 3).
8. Pick up the part and lap it once or twice in the same direction.
9. Rotate the part 120 degrees, placing your thumb over the spanner-wrench hole,
and lap the part the same number of times as described above.
10. Rotate the part another 120 degrees to the next spanner-wrench hole, and repeat
the lapping procedure.
Re-examine the mating surface. If necessary, repeat steps 5 through 10 until you remove most
of the contaminant. This should not require more than two to three complete rotations for an
aluminum horn or booster; a titanium component may require more rotations.
7.2.2 Horn Tip Cleaning
Take the following steps to clean the horn’s tip threads:
1. If the horn has a replaceable tip, remove it and clean its threads in alcohol.
2. Swab out the end of the horn threads with a cotton swab and alcohol.
3. Make sure both the horn and the tip are clean and completely dry before you reas-
semble them.
Refer to the Tip installation procedures for information on tightening the Tips. This is found
in
Section 4.4, Assembling the Equipment,
beginning on page 4-9.
4. Use a spanner wrench on the horn and an open-end wrench on the tip to install the
tip using the following torque specifications:
1/4-20 — tighten at 90-inch-lbs/10.16 Newton-meters
3/8-24 — tighten at 180 inch-lbs/20.33 Newton-meters
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