501 May 15/81 Repair Reference Table Figure 501 (Sheet 3) 71-00 Page 503
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
Repair Reference Table 501
71-00 Figure 501 (Sheet 4) Feb 20/92
Page 504
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CAUTION: BEFORE OPERATING ENGINE, CHECK THAT ENGINE INLET, EXHAUST, AND RUNUP AREA ARE FREE OF SAND, GRAVEL, LOOSE OBJECTS, OR EQUIPMENT THAT COULD BE DRAWN INTO THE ENGINE INLET OR THROWN AFT BY THE EXHAUST BLAST.
D. Fuel and Oil Leakage Limits
(1) Fuel and oil leaks found after engine shutdown coming from connections and/or fittings, or gearbox housing parting flange oil leaks shall be repaired and the engine further tested using the following as a guide:
(a)
For oil leaks, run engine for 5 minutes at Takeoff.
(b)
For fuel leaks, run engine for 5 minutes at Takeoff. Shut down engine. Maintain fuel boost pressure to main fuel pump inlet.
NOTE: If gearbox housing parting flange nuts are re-torqued do not exceed the recommended torque as pulled studs will result from excessive torque. Torque the eight nuts at the top (straight flange) part of the gearbox parting flange.
1) Before SB 6097: Torque the eight nuts 150-170 lb-in.
2) After SB 6097: Torque six nuts and two bolts 150-170 lb-in. Torque the remaining nuts to standard torque 85-95 lb-in.
(2) An optional method of locating fuel and oil leaks may be performed as follows:
(a)
Clean suspected leak area using acetone or other suitable cleaning fluid.
(b)
Thoroughly dry suspected leak area.
(c)
Dust area with ZP-4 dry developer.
(d)
Run engine for a short time.
(e)
Shut down engine and then inspect for leak.
NOTE: White developer turns gray upon contact with oil, fuel, hydraulic fluid or other hydrocarbons.
501 May 01/99 71-00 Page 504A/504B BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(3)
Fuel or oil leakage from overboard drains, accessory drive seal drains, or No. 6 bearing sump is acceptable provided leakage is within the following limits:
(4)
If leakage is found outside of the above limits the problem shall be repaired and the engine further tested using the following as a guide:
(a)
For overboard drain leakage, run engine for 5 minutes at Max. Continuous and 5 minutes at Takeoff.
(b)
For accessory drive seal leakage and parting surface leakage, run engine for 10 minutes at Max. Continuous and 5 minutes at Takeoff.
Location Fluid Allowable Leakage
Gearbox Starter Drive Overboard Drain Gearbox Hydraulic Pump Drive Overboard Drain No. 4 Bearing Drain Tube (Engine Incorporating Carbon No. 4 Bearing Seal) Fuel Pump Drive Overboard Drain Fuel Pump Drain Fuel Control Drain P&D Valve Drain Combustion Chamber Drain Exhaust Case - No. 6 Bearing Sump Oil Oil Oil Oil Fuel Fuel Fuel Fuel Oil 10 cc/hr 10 cc/hr Oil leakage from drain tube at idle power is normal. 10 cc/hr 60 cc/hr (Engine Running and/or Shut Down) None 1. 470 cc one time upon engine shutdown. 2. 60 cc maximum after engine shutdown. 3. 360 cc/hr maximum during engine running 4. Engine incorporating plugged P&D valve drain per SB 3757: no leakage. 1. No leakage with engine running. 2. 90 cc maximum one time upon engine shutdown. 3. 60 cc/hr maximum after engine shutdown (engine incorporating plugged P&D valve drain per SB 3757). Oil wetness not resulting in oil puddling within 20 minutes after engine shutdown.
501
Oct 20/86 71-00
Page 505
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
E. Test A - Ground Check at Idle
(1)
Start engine.
(2)
Allow engine to run at IDLE for minimum of 2 minutes for oil temperature to reach 100°F (38°C).
(3)
Shut down engine.
(4)
Inspect engine tubing, connections, and components for evidence of fuel and/or oil leaks. Refer to par. 1.D. for leakage limits. Perform corrective action as required.
F. Test B - Ground Check at Maximum Cruise
(1)
Determine part power trim target Pt7 and EPR for existing ambient temperature and true local barometric pressure using applicable trim table section (Ref 71-09-200, Trim Procedure).
(2)
Start engine.
(3)
Advance thrust lever to part power trim target determined in step (1) above and maintain for minimum of 3 minutes. Ensure that engine operating limits are not exceeded.
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