TM 55284025423
1119 INSPECT ENGINE HOT END (AVIM) (Continued)
1119
d. Add 11/2 pints of nitric acid (E38) to sodium
dichromate and water solution. Stir solution
with wooden stirring rod (Appendix E).
5.
Brush seven coats of solution on bare
magnesium surface (3). Make sure solution
stays on surface for 2 to 5 minutes. Use acid
swabbing brush (E2).
Wipe bare magnesium surface (3). Use
6.
clean lintfree cloth (E26).
6.1. Rinse treated area thoroughly with cold
water.
7.
Dry bare magnesium surfaces (3) from 10
to 15 minutes. Use guntype heater.
8.
Place masking tape (E35) (4) around dam
aged area (2).
8.1. Using an acid swabbing brush (E2) apply
clear synthetic sealant (E12) to affected
area. Smoothly blend sealant with original
coating.
NOTE
A 250 watt reflector heat lamp placed 2 to
4 inches from surface will cure sealant in
approximately 3 hours provided the sur-
face temperature reaches 120_F (49_C)
by the end of cure cycle.
Brush on engine gray enamel (E22) over
9.
damaged area (2). Use acid swabbing brush
(E2).
Let area air dry for a minimum of 4 hours.
10.
11. Remove masking tape (E35) (4).
INSPECT
FOLLOWON MAINTENANCE:
None
END OF TASK
Change 11 1645
