S 034-053

 (4)  
Disconnect the pneumatic overtemperature sense hose from the tee fitting on the right side of the PRSOV.

 S 424-056
 CAUTION:_______MAKE SURE YOU INSTALL CAPS ON THE SENSE HOSE AND PORT. IF YOU DO NOT INSTALL THE CAPS, CONTAMINATION CAN OCCUR.
 (5)  
Install a cap on the sense hose and the tee fitting for the PRSOV.

 S 034-055

 (6)  
Disconnect the control line to the bleed air regulator at the tee fitting on the right side of the PRSOV.

 S 424-057
 CAUTION:_______MAKE SURE YOU INSTALL A CAP ON THE PRESSURE LINE. IF YOU DO NOT INSTALL A CAP IN THE LINE, CONTAMINATION CAN OCCUR.
 (7)  
Install a cap on the control line and the tee fitting for the PRSOV.

 S 034-058

 (8)  
On engines with the downstream sense line to the bleed air regulator, disconnect the downstream sense line to the bleed air regulator at the PRSOV port.

 S 424-059
 CAUTION:_______MAKE SURE YOU INSTALL A CAP ON THE SENSE LINE. IF YOU DO NOT INSTALL A CAP IN THE LINE, CONTAMINATION CAN OCCUR.
 (9)  Install a cap on the line and the port on the PRSOV.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 36-11-15
 ALL  ú ú 01 Page 406 ú Mar 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
SEEA
PRECOOLER
CONTROL VALVE

PRECOOLER
DOWNSTREAM SENSE LINE TO BLEED AIR REGULATOR
1
CONTROL LINE TO BLEED AIR REGULATOR
A 737-300/400/500MAINTENANCE MANUAL
FAN AIR DUCT
PNEUMATIC OVERTEMPERATURE SENSE HOSE
5TH-STAGE DUCT
1. CLAMP
2. WASHER PRSOV
3. NUT
FWD
A
1 ENGINES WITH DOWNSTREAM SENSE LINE TO BLEED AIR REGULATOR
Pneumatic Disconnects on the PRSOV - Right Side Figure 402 (Sheet 1)
E54249
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ENGINES WITH THE ELECTRICAL CONNECTOR ú

 36-11-15
 (D1204) AT THE STRUT FIREWALL  ú ú 01 Page 407 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
SEE  B 
FAN AIR DUCT 
VALVE CONTROL PRECOOLER 
PRECOOLER 
BRACKET PRSOV 
1 DOWNSTREAM SENSE LINE TO BLEED AIR REGULATOR  SENSE HOSE OVERTEMPERATURE PNEUMATIC 
1. CLAMP 2. WASHER 5TH-STAGE DUCT 3. NUT 
CONTROL LINE TO BLEED AIR REGULATOR  PRSOV B  FWD 
1  ENGINES WITH DOWNSTREAM SENSE LINE TO BLEED AIR REGULATOR 
Pneumatic Disconnects on the PRSOV - Right Side Figure 402 (Sheet 2)

 E54250
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ENGINES WITH THE ELECTRICAL CONNECTORS ú

 36-11-15
 (D1208, D1210) ATTACHED TO THE PRSOV  ú ú 01 Page 408 ú Mar 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 S 034-038
 (10) Prepare to disconnect the PRSOV from the left side as follows (Fig. 403):
 (a)  
Make a mark on the valve and the adjacent structure to show the valve position for installation. 1) Make sure to create a similar mark on the replacement PRSOV

 at the same orientation as that shown on the marked PRSOV.

 (b)  
Remove the two couplings (1) and discard the E-seals (2) that attach the PRSOV to the precooler and the 5th-stage bleed duct.

 NOTE: It may be necessary to loosen couplings on the
____ 5th-stage duct forward of the valve to get clearance between the PRSOV and the precooler.
 S 824-060
 (11)
 Lower the PRSOV until it touches the engine case.

 S 034-061

 (12)
 Disconnect the PRSOV downstream sense line from the left side of the PRSOV.

 NOTE: To make the disconnect easier, turn the PRSOV clockwise
　
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