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Inspection and Maintenance — GEK 107048
Note: All axial compressor clearances are to be measured with the rotor in
contact with the forward or "normally loaded" face of the thrust
bearing.
7. Measure and record stator blade tip clearances for all seventeen compressor stages (S1 to S17).
8. Measure and record compressor rotor blade tip clearances for all seventeen compressor stages (R1
to R17).
9. Measure and record exit guide vane stator blade clearances (EGV1 and EGV2).
10. Measure and record the compressor rotor leak off clearances as well as the radial and axial packing
gland clearances (P1, P2, P3 and P4).
11. Measure and record the inlet guide vane and rub ring clearances (X, X1, and X2). Clearances are
referenced on Inspection Form PGS/GT-FF-6108.
Note: If dirt has been left on compressor blade tips after cleaning during op-
eration and prior to shutdown it may be necessary to hand clean the
blade tips before making clearance checks or proceeding with visual in-
spection. Refer to Gas Turbine Compressor Cleaning in the Standard
Practices section, of this Service Manual.
12. Make visual inspection for compressor blade tip rubs, visible cracks, corrosion, erosion and for-
eign object damage.
13. Report the conditions found on PGS/GT-FF-6107 Inspection Form.
Operation 16 — Perform Hot Gas Path Disassembly Procedures, Operations 11 Through 17
Note: Refer to the Hot Gas Path Inspection, in this Service Manual for the fol-
lowing disassembly operations.
1. Remove upper half first stage nozzle.
2. Remove lower half first stage nozzle.
3. Remove lower half second and third stage nozzle radial retaining pins.
4. Remove lower half second and third stage nozzle segments.
Operation 17 — How to Remove Upper Half Number One and Two Bearing Housings
Note: The upper half of number one bearing housing weighs approximately
560 pounds and the upper half of number two bearing weighs approxi-
mately 380 pounds.
Number One Bearing
Note: On some units the upper half number one bearing liner will be as-
sembled to the upper half housing and will be removed with the hous-
Major Inspection — Disassembly Procedures
MI-D-21
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