S 614-008
 (2)  Fill the oil tank (AMM 49-91-31/301).
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 49-91-31
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
OIL COOLER - REMOVAL/INSTALLATION
_________________________________
 1.  General________
 A.  This procedure gives the steps to remove and to install the oil cooler. The oil cooler is found on the forward end of the APU power plant.
 TASK 49-91-41-004-001
 2.  Oil Cooler Removal (Fig. 401)__________________
 A.  References
 (1)  AMM 49-72-11/401, Elapsed Time Indicator
 B.  Access
 (1)  
Location Zones
 101 Control Cabin, LH
 205 Electronic Compartment
 703 APU Compartment

 (2)  
Access Panels
 1201 Electronic Equipment Access Door
 3804 APU Cowl Door

 C.  Procedure
 S 864-002
 (1)  Set the switch and the circuit breaker:
 (a)  
Set the APU master switch on the P5 forward overhead panel to the OFF position and attach a DO-NOT-OPERATE tag.

 (b)  
Open this circuit breaker and attach a DO-NOT-CLOSE tag. 1) E3-3 Electrical Shelf, APU Control Unit

 S 014-003
 (2)  Open the APU cowl door:
 (a)  
Open the latches for the APU cowl door.

 (b)  
Open the APU cowl door.

 (c)  
Connect the door support rods.

 S 014-014
 CAUTION:_______BE CAREFUL WHEN YOU MOVE THE LOWER SHROUD. DAMAGE TO THE SHROUD DRAIN LINES CAN OCCUR.
 (3)  Remove the lower shroud:
 (a) Hold the lower shroud and open the shroud latches.
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 ALL  ú ú 01 Page 401 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
SEE B FWD
A
CROSSOVER DUCT FOR
THE COOLING AIR

ELAPSED TIME INDICATOR
INLET LINE FOR THE OIL COOLER
CIRCUIT BREAKER
OUTLET LINE FOR
CLAMP THE OIL COOLER
GASKET
OIL COOLER
CLAMP BRACKET B
Oil Cooler Installation Figure 401
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 49-91-41
 ALL  ú ú 01 Page 402 ú Nov 15/91
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
(b)  Remove the lower shroud.
 S 024-005
 (4)  Remove the oil cooler:
 (a)  
Disconnect the electrical plug from the elapsed time indicator.

 (b)  
Disconnect electrical leads from the circuit breaker terminals. 1) Put tags on the electrical leads.

 (c)  
Disconnect the inlet line for the oil cooler from the fitting on the oil cooler.

 (d)  
Disconnect the outlet line for the oil cooler from the fitting on the oil cooler.

 (e)  
Remove the clamp that attaches the crossover duct for the cooling air to the oil cooler.

 (f)  
Remove the packing for the oil cooler. 1) Discard the packing.

 (g)  
Remove the clamp that attaches the oil cooler to the bracket on the side of the accessory drive gearbox.

 (h)  
Remove the oil cooler.

 (i)  
If the elapsed time indicator will be replaced, remove the elapsed time indicator (AMM 49-72-11/401).

 TASK 49-91-41-404-006
 3. Oil Cooler Installation (Fig. 401)
_______________________
 A. References
 (1)  
AMM 12-13-31/301, APU Oil Tank

 (2)  
AMM 49-11-00/201, APU Power Plant

 (3)  
AMM 49-72-11/401, Elapsed Time Indicator
　
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