Preliminary Requirements

Procedure

1. SUBTASK 72-42-61-350-071 Remove the Access Cover

   NOTE

   It is not necessary to remove the access cover if the fuel nozzle guide retainers are not being replaced.

   1. Refer to Figure.

   2. Remove the rivets which hold the cover in place.

      1. Grind away the rivet heads, pry the cover off, then drive out the rivets.

         This procedure will keep the possibility of damage to a minimum.

         Be sure to account for all pieces of rivets that are longer than 0.050 in. (1.27 mm).

2. SUBTASK 72-42-61-350-072 Remove the Fuel Nozzle Guide

   1. Refer to Figure and Figure.

   2. Attach the IAE 3P16449 Wrench 1 off to the fuel nozzle guide.

      1. Refer to Fig. 72-42-61-900-042. Install the base detail from the rear of the fuel nozzle guide with the 15 pins. (The pins are installed in the 15 guide cooling air holes). Attach the conical-shaped end plate to the base detail from the front of the fuel nozzle guide with a standard bolt. Torque the bolt to 144 to 192 lbfin (16.270 to 21.693 Nm).

   3. Grind the two tack welds which lock the retainer to the guide.

      1. Use a 1/4 inch diameter ball and a rotary filing bit to remove a minimum of guide material. Be careful to grind only the tack weld. It is not permitted to grind more than 1.00 in. (25.4 mm) cicumferentially at one of the tack weld locations. If you grind too much, the parts cannot be reassembled and will have to be replaced. Grind a little at a time, then try to remove the guide. Grind only enough to permit removal of the guide. Remove the guide from the rear with the 3/8 inch drive adapter (thread is left hand). Use a maximum torque of 600 lbfin (67.791 Nm). Too much torque to remove the guide from the retainer can cause damage to the bulkhead segment anti-rotation stud and/or the retainer clocking tangs. Set the guide towards the bulkhead anti-rotation stud while you remove the guide.

3. SUBTASK 72-42-61-220-128 Examine the Liner (Bulkhead) Segment, the Fuel Nozzle Guide and the Fuel Nozzle Guide Retainer for Damage

   1. Examine the bulkhead segment for cracks and burns.

      1. Refer to TASK 72-42-61-200-000 (INSPECTION/CHECK-000).

         Use a white light and 3X magnification.

         If the cracks or burns are more than what is permitted in TASK 72-42-61-200-000 (INSPECTION/CHECK-000 Page-801), refer to Repair, VRS3096 TASK 72-42-61-300-008 (REPAIR-008) to replace the bulkhead segment.

         If you used more than 600 lbfin (67.791 Nm) of torque to remove the fuel nozzle guide, refer to Repair, VRS3096 TASK 72-42-61-300-008 (REPAIR-008) to remove and inspect the bulkhead segments.

   2. Examine the fuel nozzle guide for thread damage.

      1. Refer to TASK 72-42-61-200-000 (INSPECTION/CHECK-000).

         There must be a minimum of two complete threads.

         Replace guides that have less than two complete threads. A complete thread means the thread is continuous for 360 degrees. You can chase the threads to repair the guide so it can be assembled again with the correct torque.

         Blending of tack weld locations is limited to 1.000 in. (25.44 mm) circumferentially at each location. The areas where you removed the tack weld must be blended smoothly with adjacent surfaces and you must remove burrs and sharp edges. If all four tack weld locations were blended, the fuel nozzle guide must be rejected.

   3. Examine the fuel nozzle guide retainer for cracks, burns, wear or thread damage.

      1. If there are cracks or burns, or if an area is less than 0.030 in. (0.76 mm) thick and there is a step that is more than 0.005 in. (0.13 mm), replace the retainer.

         There must be a minimum of three complete threads.

         Replace retainers that have less than three complete threads. A complete thread means it is continuous for 360 degrees. You can chase the threads to repair the guide so it can be assembled again with the correct torque.

         Blending of tack weld locations is limited to 1.000 in. (25.44 mm) circumferentially at each location. The areas where you removed the tack weld must be blended smoothly with adjacent surfaces and you must remove burrs and sharp edges. If all four tack weld locations were blended, the fuel nozzle guide must be rejected.

4. SUBTASK 72-42-61-350-073 Install New Fuel Nozzle Guides and Retainers

   1. Refer to Figure.

   2. Make sure that the bulkhead segment is in place.

   3. Locate the retainer correctly over the bushing on the segment stud.

   4. Turn the guide into the retainer.

      1. Do not use more than 240 lbfin (27.116 Nm) of torque to turn the guide into the retainer. If you need to use more than 240 lbfin (27.116 Nm) of torque, clean or chase the threads of the guide and/or the retainer before you assemble them again.

         Get the correct clearance between the guide and the bulkhead segment.

   5. Tack weld the guide.

      1. Use CoMat 03-243 WELDING FILLER WIRE.

         Refer to the SPM TASK 70-31-13-310-501.

5. SUBTASK 72-42-61-220-129 Examine the Fuel Nozzle Guide for Clearance

   1. Refer to Figure.

   2. Examine the clearance between the fuel nozzle guide and the bulkhead segment.

6. SUBTASK 72-42-61-350-074 Replace the Access Cover

   1. Refer to Figure.

   2. Install the access cover.

      1. Refer to the SPM TASK 70-39-03-390-501.

         Replace the cover with a new one if there are dents deeper than 0.050 in. (1.27 mm) or if it is visually cracked.

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



Figure: Repair Details and Dimensions

Repair Details and Dimensions