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Page Title: INSTALL BACKPLATE (WITH THRUST SPACER), COMPRESSOR WHEEL, AND NUT
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TM 9-2990-206-34&P
ASSEMBLY--Continued.
INSTALL BACKPLATE (WITH THRUST SPACER), COMPRESSOR
WHEEL, AND NUT
TOOLS :
9/16 inch, 1/2 inch drive socket
3/16inch, angular offset box wrench, 12 point
1/2 inch, 1/2 inch drive socket, 12 point
1/2 inch drive, O to 300 pound-inches, torque wrench
INSTALLATION:
1.
Hold thrust spacer (A) in position in back-
plate (B) and install backplate on center
housing (C).  Install four flat washers and
bolts (D) and tighten using 9/16 inch socket
and torque wrench.  Torque tighten to 275
pound-inches (31 N-m).
Place a 13/16 inch angular 12 point box
2.
wrench (E) in vise.  Position wrench
to hold turbine wheel hub.
Place turbine wheel hub in box wrench (E)
3.
and hold in position.  Install compressor
wheel (F) on turbine wheel shaft.  Install
compressor wheel nut (G).
4.
Using torque wrench (H), torque tighten nut
to 137 pound-inches (15.5 N-m) to seat the
compressor wheel against the thrust spacer (A).
5.
Loosen compressor wheel nut two turns. Tighten
nut one turn and note drag torque (torque re-
quired to turn nut before it seats on the com-
presser wheel).  Tighten nut to 45 pound-inches
(5 N-m) above drag torque.
NOTE
A sharp increase in torque will be
noted when the nut bottoms against
the compressor wheel.
Tighten nut to final position by pulling the
6.
O-
wrench through an angle of llO beyond the 45
pound-inches (5 Nom) torque point to attain
proper shaft stretch.
TA097828
3-22

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