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Inspection and Maintenance — GEK 107048
III. Reassembly Procedures For MS-6001B DLN-1 Combustion Systems
Operation 1 — How to Perform Transition Piece Preassembly Inspections and Checks
1. Prior to installation, inspect transition pieces for obvious handling or transportation damage; such
as deformed floating seals and pinched end seal slots and damaged inner brackets. Trial fit end
seals into transition piece end seal slots before installing transition piece into the unit.
2. Trial fit each support clamp (bullhorn) to its respective transition piece prior to installing into the
unit.
3. Check first stage nozzle segments for axial displacement (steps) between adjoining segments.
Displacement greater than 0.030 in. should be reseated with a 5 pound rawhide or nylon mallet.
Do not use metal hammer.
4. Check to insure that the first stage nozzle seal slots are free from damage such as nicks, burrs or
any other faults which would interfere with the proper assembly of the transition piece floating
seals to the first stage nozzle.
5. Check all helicoils for cross threading, elongation, stripping or insert backing out. Remove and
replace all damaged helicoils.
Operation 2 — How to Install Transition Pieces
1. Install the transition piece guide pin, if removed, into the center mounting hole of the first-stage
nozzle retaining ring in the number five (5) position. See Figure CI-R.1.
Note: The last transition piece to be installed can be in the 1, 9 or 10 location
dependent on which turbine casing access port was used at disassembly.
Install the transition pieces starting with number 5; then install 4, 6, 7,
3, 2, 8, 1, 9 and 10 last or as stated above number 1 or 9 last.
2. Slide number five (5) transition piece over the guide pin to support the transition piece. Insert the
floating seals into their respective slots in the first stage nozzle side wall. Prior to installation of
all bolts, lubricate threads with Fel Pro C-102. Assemble the support clamp to the transition piece
forward mounting bracket slots. Install the support clamp lockplates and bolts. Bolt the support
clamp to the compressor discharge casing. Do not tighten bolts or bend lockplates at this time.
See Figure CI-R.2.
3. Install the aft bracket bolts and lockplates and tighten to the first stage nozzle retaining ring. Prior
to torquing the bolts, check for proper floating seal engagement to the first stage nozzle slots.
Torquing aft bracket bolts with floating seal out of its slot will result in damage to seal. Torque
aft bracket bolts to 75–85 lb. ft. Do not bend lockplate tabs at this time.
CAUTION
Use new bolts and lockplates. Do not reuse hardware pre-
viously removed.
Combustion Inspection — Reassembly Procedures
CI-R-1
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