Table 2-1. Troubleshooting-continued - TM-9-2990-206-34-P0019

TM 9-2990-206-34&P

Table 2-1. Troubleshooting - Continued.

PROBLEM

PROBABLE CAUSE

CORRECTIVE ACTION

7. Compressor wheel and turbine wheels appear very loose when moved in and out or

up and down by hand, evidenced by excessive noise.

Worn sleeve bearings, thrust ring, or thrust bearing.

Disassemble and repair turbosupercharger. Refer to page 3-1.

8. Compressor wheel and turbine wheels turn freely, without binding or rubbing,

when spun by hand.

a. Check Radial Clearance.

If necessary remove mounting leg

before removing drain tube.

(1) Using 9/16 inch double offset

box wrench, remove two bolts

(2)

Remove oil drain tube (B).

(3 )

Remove and discard gasket (C).

Position a dial indicator (D) on

(4)

mounting leg (or any flat sur-

face) so that the plunger ex-

tends through the oil drain hole

and contacts the turbine wheel

shaft.

Apply equal pressure to the com-

(5)

presser wheel and turbine wheel

to move the turbine wheel shaft

away from the indicator plunger.

Set the dial indicator to zero.

(6)

Apply equal pressure to the com-

(7)

presser wheel and turbine wheels

to move the turbine wheel shaft

as far as possible toward the

indicator plunger. Note radial

clearance on indicator dial.

NOTE

Verify that the reading is the maximum obtainable by

rotating the wheels slightly in both directions while

applying pressure.

TA097805

2-3