(b)  
Alternate check. Magnet must be able to pick up 3/4-inch diameter steel ball bearing.

(c)  
Replace plug if magnet in plug fails above test.

E.  Using new O-ring, install magnetic plug by pushing in on plug and rotating plug. Install plugs as required in four locations shown in Fig. 601. 
CAUTION:  FAILURE TO INSTALL O-RINGS CAN RESULT IN EXCESSIVE OIL LOSS DURING ENGINE OPERATION WITH POSSIBLE ENGINE FAILURE. 
F.  Check for signs of oil leakage around plug. 
G.  Close side cowl panels.
5C8
Aug 01/96 79-21-42 Page 601
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.

G44140
Magnetic Chip Detector Installation  533 
79-21-42  Figure 601  Jun 20/91 
Page 602 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

OIL BREATHER EXTERNAL TUBES - REMOVAL/INSTALLATION
1. Remove Oil Breather External Tubes
A. Open left side cowl panel.
B. Remove all clips and/or brackets securing No. 1 and No. 4 bearing breather tubes.
C. Remove No. 1 bearing breather tube (lower left side of engine). See figure 401.
D. Remove No. 4 bearing breather tube (left side, gearbox to diffuser case outer duct).

H29514
500  Oil Breather External Tubes Installation 
Nov 15/67  Figure 401 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  79-21-51 Page 401 

2.  Install Oil Breather External Tubes
A.  Using new packings and retainers as indicated, install the following breather tubes:
(1)  
Fasten No. 1 bearing breather tube at six o'clock position on front compressor inlet case using a packing and retainer. Fasten other end at gearbox using a packing and retainer, then tighten nut to required torque and lockwire.

(2)  
Connect No. 4 bearing breather tube on diffuser outer duct using a new packing, a plate, two washers, two bolts and nuts. Tighten nuts to recommended torque. (Refer to Chapter 72, Engine.) Lockwire nuts.

(3)  
Fasten other end of No. 4 bearing breather tube to gearbox using a ferrule, packing, retainer and nut. Tighten nut to recommended torque (Refer to 72-00, Removal/Installation, P&WA JT8D Maintenance Manual), and lockwire.

B.  Secure all clips and brackets to breather tube assemblies with screws.
C.  Close left side cowl panel.
D.  Test engine in accordance with Power Plant Repair Reference Table, Test C and allow oil temperature to reach 40°C during test. Refer to Chapter 71, Power Plant.
500 
79-21-51 Page 402  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  May 15/78 

P&WA 79-23-1, page 402, Aug 01/71

OIL COOLER TO OIL PRESSURE RELIEF VALVE TUBE
(OIL COOLER OUTLET SENSING LINE) - REMOVAL/INSTALLATION

H31471
79-23-1 Page 403 Feb 01/74
1.  Remove Oil Cooler Outlet Sensing Line
A.  Open left side cowl panel.
B.  Disconnect tube at forward end of oil cooler bypass valve strainer and at tube connection on rear side of gearbox.
2.  Install Oil Cooler Outlet Sensing Line
A.  Using new packing, and retainer, install oil cooler outlet sensing line at forward end of oil cooler bypass valve strainer.
B.  Secure other end of elbow at rear of gearbox at pressure relief valve using a new packing and retainer.
C.  Tighten to recommended torque (Ref Chapter 72, Engine). Lockwire connections.
D.  Close left side cowl panel.
E.  Test engine in accordance with Power Plant Repair Reference Table, Test A and allow oil temperature to reach 40°C during test (Ref Chapter 71, Power Plant).

542  Oil Cooler Outlet Sensing Line 
Feb 01/76  Figure 401  79-21-61 
Page 401 
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 

GEARBOX TO OIL COOLER TUBE – REMOVAL INSTALLATION
1.  Remove Gearbox to Oil Cooler Tube
A.  Open left side cowl panel.
B.  Remove all clips and brackets securing tube to engine.
C.  Disconnect oil cooler tube at gearbox end and at oil cooler end.
2.  Install Gearbox to Oil Cooler Tube
A.  Install oil cooler tube at oil cooler using a ferrule, a new packing and retainer and nut.
B.  Tighten nut to recommended torque (Ref chapter 72, Engine). Lockwire nut.
C.  Install oil cooler tube at gearbox end using a new packing and two bolts.
D.  Tighten bolts to recommended torque (Ref Chapter 72, Engine).
E.  Close left side cowl panel.
　
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