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B.  The oil breather pressure test is performed with cowl panels and breather duct removed to ensure that engine oil breather pressure is within acceptable limits.
2.  Equipment and Materials
A.  Oil Breather Pressure Test Equipment - F72903-24
3.  Test Oil Breather Pressure
A.  Remove engine cowl panels (Ref 71-11-11).
B.  Remove gearbox breather duct from engine.
C.  On engines with oil pressure transmitter vented to gearbox, disconnect vent tube at LV3 gearbox location (Fig. 201) and remove elbow from LV3 port. On engines with oil pressure transmitter vented to ambient, remove P&WA installed LV3 gearbox fitting.
D.  Connect oil breather test gage to LV3 port.
E.  On ALL JT8D engines, determine takeoff EPR for existing ambient temperature and true local barometric pressure using applicable trim table section (Ref 71-09-200, Trim Procedure). On JT8D-17R engines, after determining takeoff EPR above subtract 0.10 (O.A.T. - 690F to 860F),
0.11 (O.A.T. 870F to 1090F), or 0.12 (O.A.T. 1100F to 1200F). This adjusted takeoff EPR value will be used in step G below.
F.  Start engine and operate at idle for 5 minutes (Ref 71-09-100, MP).
G.  Advance thrust lever to no bleed takeoff EPR setting determined in step E.
CAUTION:  THERE IS NO THRUST LEVER STOP AT TAKEOFF POWER RATING. DURING ENGINE OPERATION AT TAKEOFF RATING, EXHAUST GAS TEMPERATURE, N1 AND N2 RPM MUST BE CLOSELY MONITORED TO ENSURE THAT OPERATING LIMITATIONS ARE NOT EXCEEDED. MONITOR "GEN DRIVE OIL IN TEMP" INDICATOR. OIL TEMPERATURE SHOULD NOT EXCEED 1250C.
H.  Allow engine to remain at takeoff power (minimum of 2 minutes at takeoff), record gearbox breather pressure as follows:
WARNING:  WHEN NECESSARY TO APPROACH AN OPERATING ENGINE, EAR PROTECTIVE DEVICES MUST BE WORN AND EXTREME CARE MUST BE EXERCISED TO REMAIN CLEAR OF ENGINE HAZARD AREAS DEFINED IN 71-00, MP. RECORD PRESSURE WHILE ENGINE IS AT IDLE.
(1)  Retard thrust lever to idle, then record maximum indicated gearbox breather pressure.
577 
Apr 01/97  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  79-21-0 Page 201 

H27684
Oil Breather Pressure Test  500 
79-21-0 Page 202  Figure 201 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Aug 15/79 

 

I.  Compare recorded gearbox breather pressure with maximum allowable pressure of 8.5 inches Hg (4.2 psig) *[1].
*[1]  7.1 inches Hg (3.5 psig) for engines with No. 4 bearing carbon seal (incorporated by original build or by P&WA SB 5250).
NOTE:  Engines with breather pressure tests conducted using continuous permanent recording equipment may be continued in service if the steady state limit of 7.1 in. Hg. (3.5 psi) is exceeded for no more than 30 seconds and the pressure level does not exceed 10.2 in. Hg. (5.0 psi). An engine accepted to this additional limit must be put on watch and a repeat test conducted every 50 cycles thereafter.
Total breather pressure must not exceed 13 in. Hg. that is, back pressure produced by any ducting attached to breather vent must not exceed difference between engine breather pressure and 13 in. Hg.
J.  Shut down engine.
K.  If gearbox breather pressure is not within acceptable limits (Ref P&WA 72-00, Engine -Troubleshooting).
L.  Remove test equipment, and install elbow in LV3 port and connect vent tube to gearbox, or reinstall P&WA LV3 gearbox fitting, as applicable.
M.  Install engine cowl panels (Ref 71-11-11).
506 
Feb 20/85  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  79-21-0 Page 203 

FUEL/OIL COOLER - REMOVAL/INSTALLATION
1. General
A.  The fuel/oil cooler, located on the engine left side at about the 8 o'clock position, is paired with the fuel flow transmitter in a common assembly. To facilitate removal of the fuel/oil cooler, the unit is removed with the fuel flow transmitter. The two components can then be separated.
2.  Prepare to Remove Fuel/Oil Cooler
A.  Open applicable Oil Temperature and Pressure circuit breaker on panel P6.
CAUTION:  FAILURE TO OPEN CIRCUIT BREAKER BEFORE REMOVING OIL TEMPERATURE BULB ELECTRICAL CONNECTOR MAY RESULT IN DAMAGE TO OIL TEMPERATURE INDICATOR.
B.  Open applicable Fuel Flow circuit breaker on panel P6 to prevent fuel flow transmitter damage resulting from dry operation.
C.  Open left side cowl panel.
D.  Place suitable container under fuel/oil cooler and fuel flow transmitter to catch fuel and oil spillage.
E.  Remove drain plug at bottom of fuel inlet connector tube (14, figure 401) and drain fuel into container.
　
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