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Major Inspection — Disassembly Procedures
Note: The upper half rub ring is lifted as part of the upper half inlet casing.
Operation 11 — Perform Hot Gas Path Disassembly Operations 6 Thru 11
Note: Refer to the Hot Gas Path Inspection section, in this Service Manual for
the following disassembly operations.
1. Remove turbine casing bolts and upper half first stage nozzle eccentric pin.
2. Remove upper half turbine casing.
3. Take turbine clearance checks.
4. Unbolt and remove transition pieces.
5. Take first stage nozzle radial concentricity checks.
6. Remove upper half first stage nozzle.
Operation 12 — How to Remove Upper Half First Stage Nozzle Support Ring
1. Unbolt and remove the support ring horizontal bolts.
2. Unbolt the upper half vertical bolting from the compressor discharge case inner barrel.
3. Rig to the tapped holes provided and lift the support ring clear of the unit. Set on suitable blocking
to protect from damage.
4. Remove and identify the support ring shim plates. See Figure MI-D.5.
5. Bag and identify bolting.
Operation 13 — How to Remove Compressor Discharge and Aft Compressor Casing
Note: Later vintage units do not have an aft compressor casing, it has been
combined as a one piece casing with the forward compressor casing. If
the unit does have an aft compressor casing it can be removed along
with the compressor discharge casing as a single unit.
1. Remove the vertical flange bolting between the upper halves of the compressor discharge casing
and inner compressor discharge casing.
2. Remove all the horizontal joint bolting from the compressor discharge casing inner and outer
joints. See Figure MI-D.6.
3. Remove the horizontal bolting from the aft compressor casing joint (if applicable).
4. Remove the circumferential bolting between the aft flange of the compressor casing and the for-
ward flange of the first stage nozzle support ring.
MI-D-14
Inspection and Maintenance — GEK 107048
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