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Inspection and Maintenance — GEK 107048
5. Insert the guide pins, eight total, in the body bound bolt holes of the aft compressor casing, if appli-
cable, and the compressor discharge casing. Refer to Special Tool Listing in the Standard Practices
section of this Service Manual for proper guide pins to be used. See Figure MI-D.2 for guide pin
locations in the casings.
6. Jack the aft, if applicable, and compressor discharge casings apart utilizing the jacking bolt holes
provided. Refer to Special Tool listing in the Standard Practices section, of this Service Manual
for proper jacking bolts to be used in each casing.
7. Rig and lift the compressor discharge and aft compressor casing, if applicable, clear of the unit.
Refer to the Weights and Center of Gravity drawing in the Reference Drawings section of this Ser-
vice Manual.
8. Set the compressor discharge casing on suitable blocking in an upright position on the inner verti-
cal bolting flange with supports placed between the compressor discharge bulkhead vertical flange
and the seating surface. See Figure MI-D.7.
Operation 14 — How to Remove the Inner Compressor Discharge Casing
1. Unbolt the recessed horizontal joint bolts in the inner compressor discharge casing. Install the lift-
ing lugs and lift the top half clear. Exercise care when starting to lift as there are no jack bolts to
separate the joint. See Figures MI-D.8 and MI-D.9.
Operation 15 — How to Take Rotor Thrust and Compressor Clearances
1. To take rotor thrust clearances, mount a dial indicator on the number 1 bearing housing, to be able
to read axial movement of the turbine rotor.
Note: Do not use any stationary reference point other than the number 1
bearing housing so as to prevent erroneous readings.
2. Move the rotor axially with a small hydraulic ram and blocking between the inlet casing and the
compressor rotor toward the exhaust end of the turbine until the rotor "bumps" against the "un-
loaded" thrust face. Set the dial indicator to zero.
3. Move the rotor axially toward the compressor inlet, using a small ram and blocking between the
load gear coupling and the forward load gear bearing housing. The rotor should be firmly against
the "loaded" thrust face but not loaded so as to deflect the bearing or casings when the indicator
is read.
4. Read the amount of rotor movement as shown on the dial indicator.
5. The range of axial movement of the rotor without distorting the rotor or bearing mounts is usually
between 14 and 20 thousandths of an inch. Repeat the rotor thrust check at least three (3) consecu-
tive times in order to assure repeatability.
6. Record thrust movement on Inspection Form PGS/GT-FF-6117. Take compressor clearance read-
ings and record them on Inspection Form PGS/GT-FF-6106 and PGS/GT-FF-6108.
Major Inspection — Disassembly Procedures
MI-D-17
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