B.  Open circuit breaker on face of APU control unit (located in electrical and electronic bay).
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.
3.  Remove Oil Pump Drive Shaft Seal (Fig. 401)
A.  Remove tachometer-generator cover.
(1)  
Disconnect electrical connector.

(2)  
Remove four nuts and washers.

(3)  
Remove cover and gasket.

B.  Remove ring securing seal.
C.  Using puller, remove seal and packing.
Aug 01/94 49-91-51 Page 401

G02340
Oil Pump Drive Shaft Seal Installation  500 
49-91-51  Figure 401  Aug 15/72 
Page 402 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

4.  Install Oil Pump Drive Shaft Seal (Fig. 401)
A.  Coat new packing and new seal with petrolatum.
B.  Install new packing.
C.  Install new seal with lip facing outward.
D.  Secure seal in position with ring.
E.  Install tachometer-generator cover and gasket.
F.  Secure cover with nuts and washers.
G.  Connect electrical connector.
H.  Close the circuit breaker on M280 module-APU control unit on E3-3 electronic shelf.
I.  Position BATTERY switch to ON and remove placards.
J.  APUs WITH ALLIEDSIGNAL SB GTCP85-49-7096;
Examine the oil pump for leakage:

(1)  
Start and operate the APU (AMM 49-11-0/201).

(2)  
During the APU operation, examine the oil pump 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.

K.  APUs WITHOUT ALLIEDSIGNAL SB GTCP85-49-7096;
Examine the oil pump 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 pump for any signs of leakage:

(a)  If you found signs of leakage, repair the cause of it.
5.  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.
Aug 01/95 49-91-51 Page 403 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

OIL TANK VENT LINE - INSPECTION/CHECK
1. Oil Tank Vent Line Check
A. Disconnect oil tank vent line at oil tank fitting and at exhaust port.
NOTE:  Have a container available to catch any residual oil that may be trapped in line.
B. Check fitting and vent flange of exhaust port for oil residue or carbon buildup.
C. Remove any buildup and blow out with compressed air.
D. Check oil tank fitting. Remove any sludge that may have accumulated in fitting.
NOTE:  If oil tank vent fitting appears to have an abnormal buildup of sludge, oil tank should be removed and thoroughly cleaned.
E. Ensure oil tank vent line is clear of any sludge or carbon buildup.
F. Connect vent line to oil tank vent fitting and exhaust port.
501 
Aug 01/75  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-91-61 Page 601 

G02348
Oil Tank Vent Line Inspection  501 
49-91-61  Figure 601  Aug 01/75 
Page 602 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

APU OIL INDICATING SYSTEM - DESCRIPTION AND OPERATION
1. General
A.  The APU oil indicating system provides means of monitoring the high oil temperature, low oil pressure, and low oil quantity. The system consists of three indicating lights, a high oil temperature switch, a low oil pressure switch, and an oil quantity transmitter (Fig. 1). The high oil temperature light and the low oil pressure light are amber; the low oil quantity light is blue. All indicating lights are located on the forward overhead panel. The switches and transmitter are located on the APU engine.
　
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