Preliminary Requirements

Procedure

1. SUBTASK 72-44-30-350-089 Remove the Liner Segments from the Combustion Chamber Inner Liner

   1. Refer to Figure.

   2. Remove nuts and liner segments as necessary. Discard the nuts.

      1. You can use a pneumatic or electric nut splitter to remove the nuts instead of a breakaway torque measurement.

2. SUBTASK 72-44-30-350-090 Remove the Gang Nut Channels from the Inner Liner

   1. Remove the gang nut channels.

      1. Refer to Repair 003, VRS3264 V2500-A0-72-44-3001-00A-920A-C.

3. SUBTASK 72-44-30-350-091-001 Size to Restore the Rear Inside Diameter Seal Diameter of the Combustion Chamber Inner Liner

   1. Refer to Figure

      NOTE

      You can use Step or Step to restore the seal diameter.

   2. Use sizing clusters in a size/shrinker to form a rear ring to the diameter.

      1. Size the diameter to 19.392 - 19.400 in. (492.557 - 492.760 mm) for a minimum axial distance of 0.250 in. (6.35 mm).

4. SUBTASK 72-44-30-350-091-002 Roll to Restore the Rear Inside Diameter Seal Diameter of the Combustion Chamber Inner Liner

   1. Refer to Figure

   2. Use a rolling tool in a vertical turret lathe to roll the diameter of the inner liner.

      1. Roll the diameter to 19.392 - 19.400 in. (492.557 - 492.760 mm) for a minimum axial distance of 0.250 in. (6.35 mm).

5. SUBTASK 72-44-30-230-056 Examine the Shell after Sizing or Rolling

   1. Refer to Figure

   2. Locally fluorescent penetrant inspect the aft end flange after you complete the sizing. No cracks are permitted.

      1. Refer to the SPM TASK 70-23-05-230-501.

         Use medium sensitivity.

6. SUBTASK 72-44-30-220-087 Examine the Rear Inside Diameter Seal of the Combustion Chamber Inner Liner

   1. Examine rear inside diameter seal for coating after sizing or rolling.

      1. Refer to TASK 72-44-30-200-000 (INSPECTION/CHECK-000).

7. SUBTASK 72-44-30-350-092 Replace the Gang Nut Channels in the Inner Liner

   1. Install gang nut channels.

      1. Refer to Repair 003, VRS3264 V2500-A0-72-44-3001-00A-920A-C.

8. SUBTASK 72-44-30-350-093 Install the Liner Segments

   1. Refer to Figure and Figure.

   2. 
      CAUTION
      DO NOT USE CoMat 10-049 MOLYBDENUM DISULFIDE TO LUBRICATE THE NUT THREADS. MOLYBDENUM DISULFIDE CAN CAUSE CORROSION.
      
      CAUTION
      DO NOT USE ENGINE OIL AND COATING CoMat 07-175 COATING COMPOUND - ALUMINUM, INORGANIC BINDER ON THE SAME STUDS.
      
      CAUTION
      IT IS REQUIRED TO USE COATING CoMat 07-175 COATING COMPOUND - ALUMINUM, INORGANIC BINDER ON ROW 1 LINER SEGMENTS AFTER FINAL TORQUE THE NUTS. DO NOT USE COATING CoMat 07-175 COATING COMPOUND - ALUMINUM, INORGANIC BINDER ON ALL THE STUD THREADS DURING INSTALLATION.
      
      CAUTION
      COATING CoMat 07-175 COATING COMPOUND - ALUMINUM, INORGANIC BINDER IS OPTIONAL ON OTHER LINER SEGMENTS (ROWS 2 THRU 5). HOWEVER, DO NOT USE COATING CoMat 07-175 COATING COMPOUND - ALUMINUM, INORGANIC BINDER IF ENGINE OIL WAS ALREADY APPLIED ON THE STUD THREADS.
      
      CAUTION
      IF COATING CoMat 07-175 COATING COMPOUND - ALUMINUM, INORGANIC BINDER WAS USED IN LINER SEGMENTS, LIGHTLY USE A STAINLESS STEEL WIRE BRUSH TO REMOVE LOOSE DEBRIS BEFORE NEW COATING.

      Install liner segments that you removed from back to front with washers and new nuts.

      1. Install oval-shaped washers with dimple facing to the liner shell and seated in slot.

         If engine oil is preferred on Rows 2 thru 5 liner segments, apply engine oil on the stud threads. Do not use engine oil on Row 1 liner segment stud threads.

         Install the nuts with IAE 3P16238 Angle box wrench (angle box wrench) 1 off.

         Torque the segment's center stud first followed by the two adjacent studs then the segment's two outer-most studs. Tighten nuts down on the stud between 40 to 50 lbfin (4.519 to 5.649 Nm) of torque and make sure that the washer is not free to move. Back the nut off one-half turn, then use IAE 3P16239 Ratchet wrench (ratchet wrench) 1 off to torque the nut to 25 to 35 lbfin (2.824 to 3.954 Nm).

         Apply CoMat 07-175 COATING COMPOUND - ALUMINUM, INORGANIC BINDER coating compound on the threaded studs of the Row 1 liner segments, use a small artists brush. Full coverage is necessary, but there is no thickness limit. Refer to Figure for coating application.

         If engine oil was not used on liner segments Row 2 thru 5, apply CoMat 07-175 COATING COMPOUND - ALUMINUM, INORGANIC BINDER on the threaded studs using a small artist's brush. Complete coverage is necessary but there is no thickness requirement. Refer to Figure as a reference for coating application.

Figure: Repair Details and Dimensions

Repair Details and Dimensions



Figure: Repair Details and Dimensions

Repair Details and Dimensions



Figure: Repair Details and Dimensions

Repair Details and Dimensions