TASK 24-11-17-024-001
 2.  VSCF Vacuum Break Valve Removal________________________________
 A. References
 (1)  
AMM 12-13-21/301, VSCF Generator/Converter

 (2)  
AMM 71-11-02/201, Fan Cowl Panels

 B.
Access

 (1)  
Location Zone
 504 Engine No. 1, LH
 604 Engine No. 2, LH

 (2)  
Access Panel
 5738L Thrust Reverser Cowl Assembly
 5739L Thrust Reverser Cowl Assembly

 C.
Procedure

 S 864-002
 CAUTION:_______MAKE SURE THE VSCF AREA IS CLEAN. IF THE AREA IS NOT CLEAN, CONTAMINATION MAY ENTER THE VSCF CASE AND CAUSE DAMAGE TO THE VSCF.
 (1)  Get access to the vacuum break valve.
 (a)  Open the engine cowl panel (AMM 71-11-02/201).
 S 684-003
 (2)  Drain the oil until it is below the bottom of the sight glass (AMM 12-13-21/301).
 S 024-004
 WARNING:_______REMOVE THE VSCF VACUUM BREAK VALVE SLOWLY. HOT GAS OR OIL CAN COME OUT WHEN THE ENGINE IS HOT. HOT GAS OR OIL CAN BURN YOU.
 (3)  Remove the vacuum break valve and O-ring from the valve adapter fitting.
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 S 024-005
 (4)  
Discard the O-ring.

 S 024-006

 (5)  
Remove the adapter fitting and O-ring from the VSCF.

 S 024-007

 (6)  
Discard the O-ring.

 TASK 24-11-17-424-008
 3.  VSCF Vacuum Break Valve Installation____________________________________
 A. Consumable Materials
 (1)  D00193 Lubricating Oil - MIL-L-23699 or MIL-L-7808
 B. References
 (1)  
AMM 12-13-21/301, VSCF Generator/Converter

 (2)  
AMM 71-00-00/201, Power Plant

 (3)  
AMM 71-11-02/201, Fan Cowl Panels

 C. Access
 (1)  
Location Zone
 504 Engine No. 1, LH
 604 Engine No. 2, LH

 (2)  
Access Panel
 5738L Thrust Reverser Cowl Assembly
 5739L Thrust Reverser Cowl Assembly

 D. Procedure
 S 424-009
 CAUTION:_______MAKE SURE THE VSCF AREA IS ALWAYS CLEAN. A DIRTY SYSTEM CAN CAUSE DAMAGE TO THE VSCF.
 (1)  Install the vacuum break valve.
 (a)  
Apply oil to the new O-ring, and install the new O-ring to the vacuum break valve adapter fitting.

 (b)  
Install the O-ring and adapter fitting on the VSCF. Torque the fitting to 20 to 25 pound-inches.

 (c)  
Apply oil to the new O-ring, and install the O-ring on the vacuum break valve.

 (d)  
Install the O-ring and vacuum break valve onto the adapter fitting. Torque the vacuum break valve to 20-25 pound-inches.

 S 614-010
 (2)  Fill the VSCF with oil (AMM 12-13-21/301).
 E. Examine the vacuum relief valve installation for leaks.
 S 864-011
 (1)  
Motor the engine (AMM 71-00-00/201).

 (2)  
Examine the vacuum relief valve installation for leaks.

 S 214-012
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A
737-300/400/500MAINTENANCE MANUAL
 S 414-013
 (3) Close the cowl panel (AMM 71-11-02/201).
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

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 ALL  ú ú 01A Page 403 ú Nov 15/96
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A
737-300/400/500MAINTENANCE MANUAL
　
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