Preliminary Requirements

Procedure

1. SUBTASK 72-41-30-440-206 Prepare the HP Compressor Front Cases for the Setting and Clearance Checks

   1. Refer to Figure and Figure.

   2. Install all the build pins for each stage in turn during this procedure. Do not rig the VSV system to the high speed position.

   3. Install the pins through the actuating ring and into the mating holes in the compressor case. If you cannot install a pin in an actuating ring hole because a component prevents this then omit that pin. It may be necessary to make make small adjustments to the actuating ring to install all the pins.

      1. Install the pins for the VIGV stage, it is only possible to install the four pins at positions D and E (with the left and right hand connector housings installed). At position E install two flattened pins, refer to Figure and table 1.

      2. Install the pins for the stages 3 to 6, refer to Figure and table 1.

         TABLE 1
         VIGV STAGE :
         Standard build pin - position C	IAE 1R18423 Rigging pin	2 off
         	Or
         	IAE 1R18892 Rigging pin	2 off
         Stepped build pin - position D	IAE 1R18248 Rigging pin	2 off
         	Or
         	IAE 1R18638 Rigging pin	2 off
         Flatted build pin - position E	IAE 1R18638 Rigging pin	2 off
         STAGES 3 TO 6 :
         Standard build pin - position H	IAE 1R18423 Rigging pin	6 off (for each stage)
         	Or
         Stage 3	IAE 1R18893 Riggingpin	6 off
         Stage 4	IAE 1R18894 Rigging pin	6 off
         Stage 5	IAE 1R18895 Rigging pin	6 off
         Stage 6	IAE 1R18896 Rigging pin	6 off

2. SUBTASK 72-41-30-440-207 Set the HP Compressor Front Case VSV Pad Clearances

   1. Refer to Figure and Figure.

   2. Preparation checks.

      1. Before installation inspect the left hand and right hand connectors for each stage and the mating surfaces of the actuating ring assembly for marks caused by previously misaligned dowels. This check will give some indication of the possible areas which could result in a misaligned assembly during the build procedure.

      2. Make sure that no adjusting washers are installed before you measure and calculate the pad clearances.

      3. During the assembly procedure lubricate the front compressor casing or mating pad surface for each stage with a thin layer of 10-108 teflon based lubricant, refer to Step.

      4. After the installation of the connectors make sure that the dowels are correctly installed, refer to Step.

      5. Make sure all 16 bolts which attach the connector and centralizing housing pads to the actuating ring are loosened. This will give a large clearance under each pad.

      6. Install all build pins in each stage in turn, refer to Step.

   3. Set the clearances between the compressor case and the actuating pads.

      1. For each stage in turn press each of the eight pads radially inward until the pad fully touches the HPC front case assembly.

         NOTE

         If you check the clearance with a feeler gauge in an axial position it will give large errors.

      2. Measure and make a record of the gap between the pad and the actuating ring at the adjusting washer position for that pad.

         The feeler gauge must be put under the pad circumferentially along the length of the actuating ring. Refer to Figure and Figure for the feeler gauge positions.

         NOTE

         Refer to the applicable Assembly TASK, see TASK 72-41-30-440-000 (ASSEMBLY-000) for part details of IPC Fig./item numbers for the adjusting washers for the specific configuration.

      3. Remove each bolt and washer, then calculate and install the applicable adjusting washer to give the correct clearance for each stage, refer to Table 2. It is recommended that the lower limit is achieved.

         A maximum allowable number of adjusting washers is two at each location.

         For SBE72-0277 stage 3 pads the maximum number of adjusting washers is increased to three at each location.

         TABLE 2 : TABLE OF LIMITS - VSV CLEARANCE SETTING PROCEDURE
         VSV SYSTEM STAGE	CLEARANCE - ALL PADS
         VIGV	0.003 to 0.004 in. (0.08 to 0.10 mm)
         3	0.004 to 0.005 in. (0.10 to 0.13 mm)
         4	0.008 to 0.009 in. (0.20 to 0.23 mm)
         5	0.007 to 0.008 in. (0.18 to 0.20 mm)
         6	0.008 to 0.009 in. (0.20 to 0.23 mm)

      4. Install the two bolts and washers to attach the pad and adjusting washers(s) to the actuating ring.

         NOTE

         Refer to the applicable Assembly TASK for bolt torque values, see TASK 72-41-30-440-000 (ASSEMBLY-000).

      5. Torque the bolts to the recommended torque value given in the applicable Assembly TASK.

         NOTE

         If you check the clearance with a feeler gauge in an axial position it will give large errors.

   4. Measure and make a record of the clearance between the pads and the case for each stage, refer to table 2. The clearance must agree with the limits given in table 2. If the clearance does not agree with the limits in table 2 then the clearance must be reset.

      Let the feeler gauge stay in position and then measure the next clearance at a circumferentially adjacent pad. When all eight pads are set there should be a feeler gauge remaining under each pad.

      The feeler gauge must be put under the pad circumferentially along the length of the actuating ring. Refer to Figure and Figurefor the feeler gauge positions.

   5. Complete the above procedure for all pads in all stages and remove all the feeler gauges and build pins.

   6. Completion procedures.

      1. During disassembly of the connectors from the actuating ring look for new marks from misplaced dowels, refer to TASK 72-41-30-440-010-A00 (ASSEMBLY-010, CONFIG-001).

      2. If you can see new marks then the above setting procedure must be done again for the particular stage.

3. SUBTASK 72-41-30-220-445 Check the Installation of the Left and Right Hand Connectors and VSV Actuating Ring Assembly

   1. This check must be done after each time the connectors are installed to the VSV actuating ring assemblies.

   2. This is the general procedure to make sure that the left and right hand connectors which are installed to the upper and lower actuating rings are installed correctly. The check will make sure that the dowels which hold the connectors to the actuating ring are installed correctly and are not mis-seated. The following gives the causes of an incorrectly installed assembly and what to look for :

      1. It is not easy to decide if the connectors for a particular stage is installed incorrectly. An incorrect installation can occur if a dowel is not installed correctly in a mating hole of an actuating ring and instead touches the mating face of the actuating ring.

         The wall of the actuating ring can become clamped between the dowel and the internal actuating ring boss, when this occurs the bridge piece is not held. The head of the mis-seated dowel can be visible above the connector and/or the connector could be offset from the actuating ring. Refer to Figure.

         No indication of misaligned connectors is evident when the bolt(s) are torque tightened because of a 'cross-keying' action of the dowels in the connectors.

   3. Inspect the left hand and right hand actuating ring and connector joint for each stage.

      1. Check the clearance between the connector and the actuating ring, it should be possible to put a 0.001 in. or 0.002 in. (0.025 mm. or 0.05 mm) feeler gauge in the clearance. If this is not possible do step (2).

      2. For the left hand and/or right hand joint (as applicable) examine the dowel heads, use a torch if necessary. Make a comparison in the position of each dowel. Look for differences in radial distances between the connector and the upper and lower actuating ring, all the distances should be the same. If there is a distance which does not appear regular then do steps (3) to (5).

      3. Remove the connector and look for new marks on the actuating ring adjacent to the dowel mating hole caused by a mis-aligned dowel.

      4. Install the connector and make sure the dowels are correctly seated before you torque tighten the bolts.

      5. Reset the pad clearances, refer to Step.

4. SUBTASK 72-41-30-440-208 Lubricate the VSV Mechanism at the Locations

   
   WARNING
   YOU MUST USE THE CORRECT PERSONNEL PROTECTION EQUIPMENT WHEN HANDLING AND APPLYING THE LUBRICANT, CoMat 10-108 HIGH PERFORMANCE PENETRATING LUBRICANT WITH TEFLON (R) TEFLON BASED LUBRICANT.

   1. Refer to Figure and Figure.

   2. Apply CoMat 10-108 HIGH PERFORMANCE PENETRATING LUBRICANT WITH TEFLON (R) to each of the locations which follow, refer to Figure and Figurewhich gives the typical areas for the lubrication of the mechanism. Do these procedures during each applicable assembly procedure for this configuration when told to do so.

      Apply a thin layer of lubricant using an appropriately sized brush or hand pump spray. Not an aerosol.

      1. Each pin/bush mating surface at location 1 that connects the VSV levers to the actuating ring. Lubricate all lever pins including those in the actuating ring bridge connectors, refer to Figure.

      2. Each mating surface of the variable stator vane spindle in the outer pivot bush at location 2.

      3. Each sealing washer mating surface with the vane at location 3.

      4. The mating surface of the vane spindle (the inner pivot point) with the top of each half bush at location 4.

      5. The mating inner surface of each vane half bush with the vane spindle (the inner pivot point) at location 5.

      6. The mating surface of the vane spindle (the inner pivot point) with the bottom of each half bush at location 6.

         NOTE

         It is permitted to lubricate the pad surface or the case surface.

      7. Lubricate the following locations :

      8. Each VIGV actuating ring connector housing pad to case surface at location A, Figure.

      9. Each VIGV actuating ring centralizing pad to case surface at location B, Figure.

      10. Each stage 3 thru 6 actuating ring connector/compensating housing pad to case surface at location F, Figure.

      11. Each stage 3 thru 6 actuating ring centralizing pad to case surface at location G, Figure.

Figure: HP compressor front cases and VSV actuating system

HP compressor front cases and VSV actuating system



Figure: Install the pins - VIGV actuating ring

Install the pins - VIGV actuating ring



Figure: Install the pins - Stage 3 actuating ring

Install the pins - Stage 3 actuating ring



Figure: Check the connector/bridge piece assemblies to VSV actuating ring installation for mis-seated dowels

Check the connector/bridge piece assemblies to VSV actuating ring installation for mis-seated dowels



Figure: Set the HP compressor front case (left hand side) VSV pad clearances - recommended feeler gauge positions

Set the HP compressor front case (left hand side) VSV pad clearances - recommended feeler gauge positions



Figure: Set the HP compressor front case (right hand side) VSV pad clearances - recommended feeler gauge positions

Set the HP compressor front case (right hand side) VSV pad clearances - recommended feeler gauge positions



Figure: Lubrication positions - typical for all stages

Lubrication positions - typical for all stages