INSTALL BACKPLATE (WITH THRUST SPACER), COMPRESSOR WHEEL, AND NUT

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:

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

wrench (E) in vise. Position wrench

to hold turbine wheel hub.

Place turbine wheel hub in box wrench (E)

and hold in position. Install compressor

wheel (F) on turbine wheel shaft. Install

compressor wheel nut (G).

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).

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

O-

wrench through an angle of llO beyond the 45

pound-inches (5 Nom) torque point to attain

proper shaft stretch.

TA097828

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