OIL COOLER – REMOVAL/INSTALLATION
1. Prepare to Remove Oil Cooler
A. Position BATTERY SWITCH and APU START SWITCH to OFF and placard that APU maintenance is “in work.”
B. Open the circuit breaker on M280 module-APU accessory unit on E3-3 electronic shelf.
C. Open APU compartment access door latches and open door. Install door support rods.
D. Support lower shroud, open shroud latches, and remove shroud.
CAUTION: EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
2. Remove Oil Cooler
A. Disconnect electrical plug from elapsed time indicator. (See figure 401.)
B. Tag and disconnect electrical leads from circuit breaker terminals.
C. Disconnect oil cooler inlet line from fitting on oil cooler assembly.
D. Disconnect oil cooler outlet line from fitting on oil cooler assembly.
E. Remove clamp attaching cooling air crossover duct to oil cooler assembly.
F. Remove clamp attaching oil cooler assembly to bracket on side of accessory drive gearbox.
G. Remove oil cooler assembly.
H. If required to remove elapsed time indicator, refer to 49-72-11, Elapsed Time Indicator – Removal/Installation.
3. Install Oil Cooler
A. If elapsed time indicator was removed from oil cooler, install elapsed time indicator per 49-72-11.
500
Nov 15/70 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-91-41 Page 401
G02331
Oil Cooler Installation 500
49-91-41Page 402 Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. Nov 15/68
B. Position oil cooler assembly on cooling air crossover duct, aligning oil cooler inlet and outlet line fittings with inlet and outlet lines (Fig. 401).
C. Using new gasket, install clamp attaching oil cooler assembly to cooling air crossover duct and tighten clamp.
NOTE: Orient clamps with clamp nut at the 3 o'clock position when viewed from rear of engine. Clamp should not point downward.
D. Install clamp attaching oil cooler assembly to bracket on side of accessory drive gearbox and tighten clamp.
E. Connect oil cooler outlet line to fitting on oil cooler assembly.
F. Connect oil cooler inlet line to fitting on oil cooler assembly.
G. Remove tags and connect electrical leads to circuit breaker terminals.
H. Connect electrical plug to elapsed time indicator.
I. Close the circuit breaker on M280 module-APU control unit on E3-3 electronic shelf.
J. Position BATTERY switch to ON and remove placards.
K. APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096;
Examine the oil cooler for leakage:
(1)
Start and operate the APU (AMM 49-11-0/201).
(2)
During the APU operation, examine the oil cooler for leakage.
(3)
Do the APU normal shutdown (AMM 49-11-0/201).
(4)
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.
(5)
If you found leakage, repair the cause of it.
L. APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096;
Examine the oil cooler for leakage:
(1)
Start and operate the APU (AMM 49-11-0/201).
(2)
Do the APU normal shutdown (AMM 49-11-0/201).
(3)
Attach a DO-NOT-OPERATE tag to the APU master switch on the P5 forward overhead panel.
(4)
Visually examine the oil cooler for any signs of leakage:
(a) If you found signs of leakage, repair the cause of it.
4. Restore Airplane to Normal Configuration
A. Position lower shroud against upper shroud and close shroud latches.
CAUTION: MAINTAIN A MINIMUM CLEARANCE OF 0.18 INCH BETWEEN ENGINE PLUMBING, FIRE DETECTOR, CLAMPS AND INSIDE SURFACE OF LOWER SHROUD.
EXERCISE EXTREME CARE NOT TO DAMAGE SHROUD DRAIN LINES WHEN HANDLING SHROUD.
B. Disengage APU compartment access door support rods and stow rods. Close and latch access door.
500
Aug 01/95 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 49-91-41 Page 403
OIL PUMP DRIVE SHAFT SEAL - REMOVAL/INSTALLATION
1. Equipment and Materials
A. Petrolatum - Braycote 248, Bray Oil Co., Los Angeles, California
B. Seal Puller - 280209, AlliedSignal, Inc., Airline Services Division, P.O. Box 52170, Phoenix, Arizona 85072-2170
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