TM 55-2840-241-23
CHAPTER 8
ASSEMBLY OF SUBASSEMBLIES
8-1. Scope.
This chapter presents step-by-step procedures for
reassembly of component parts into major functional
assemblies from the level of disassembly permitted by
the Maintenance Allocation Chart.
Use only chrome plated steel or unplated
steel tools for the assembly procedures
described in this manual. The use of cad-
mium or zinc plated tools is not permitted
since these platings are prone to chipping
and flaking. Should these chips enter the
engine, they may contaminate the lubrica-
tion system, ultimately clogging the filters
or produce intergranular attack on nickel
or titanium base alloys at elevated tem-
peratures.
8-2. Compressor Case Half Installation.
The compressor case halves are a
matched set and shall not be intermixed. If
the removed case half cannot be repaired
to a serviceable condition, replace both
case halves. Remove only one case half at a
time. Do not remove both case halves at the
same time. Misalignment of the com-
pressor could result if both case halves
were removed simultaneously.
a. Position the compressor case half in place on the
compressor.
b. Install eight bolts (1, figure 6-1) and nuts (7) in
each horizontal splitline. Bolts at positions two and
seven are pilot bolts. Tighten nuts on the pilot bolts to
10-15 in. lb. plus locknut drag; then tighten the
remaining nuts.
NOTE
To determine locknut drag, run the nut up snug;
then back off one-half turn. The torque required to
first turn the loosened nut is locknut drag.
c. Install the eight case-to-front diffuser bolts (4)
and nuts (6). Tighten the nuts to 10-15 in. lb. plus
locknut drag.
d. Install nameplate (8) (if applicable) and the five
case-to-front support bolts (5) and nuts (3). Tighten the
nuts to 10-15 in. lb. plus locknut drag.
Do not attempt to rotate the compressor
using a speed wrench at the tachometer
drive pad. Side loads on the speed wrench
could crack the tachometer drive shaft.
e. Turn the compressor rotor using the 6799790
engine turning adapter (figure 2-1) at the starter gen-
erator pad (figure 7-4). The rotor and gear train should
turn freely with no evidence of interference or blade tip
rub (evidenced by feel or noise).
f. Install the compressor bleed valve. (Refer to par-
agraph 5-33.)
g. Install anti-icing air tubes (23, 26, figure 5-13.)
Tighten the coupling nuts to 150-200 in. lb.
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