(b)  
The pressure decreases across the main oil filter - 50 psid

 (344.7 kPa) maximum

 (c)  
Main oil temperature:

 1)  163°C maximum before the speed of the engine increases more than idle. Measure the oil, which comes back during all stable engine operations of three minutes or more, after the engine is warm.
 2)  177°C maximum during stable engine operation at minimum idle or approach idle after a high power operation. Do not operate the engine more than 20 minutes at or above 163°C. If the oil temperatures are more than the limits, do the oil overtemperature inspection (AMM 72-00-00/201).
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////////////////////////A / PW4000 SERIES /747-400 / ENGINES/MAINTENANCE MANUAL ////////////////////////
CAUTION: YOU MUST IMMEDIATELY DISCONNECT THE IDG IF THE CONDITIONS
_______ OF THE IDG ARE MORE THAN THE LIMITS. THE EICAS ADVISORY MESSAGE, "ELEC DRIVE (1, 2, 3, OR 4)", WILL SHOW ON THE EICAS AND THE IDG DISCONNECT SWITCHES WILL COME ON. IF YOU DO NOT DISCONNECT THE IDG, DAMAGE TO THE ENGINE CAN OCCUR.
 (d)  IDG oil temperature:
 1)  179-191°C maximum for the oil temperature out and can only increase a maximum of 5-23°C.
 S 862-076-N00
 (2)  Oil specifications (see PW Service Bulletin No. 238)
 NOTE: You must correctly do the oil servicing procedure for the
____ engine before you start the engine (AMM 12-13-03/301).
 H.  Leakage Limits
 S 862-043-N00
 (1)  
The permitted leakage from the engine vents and drains during the operation and after the shutdown, with the necessary corrections, is given in AMM 71-71-00/601, Engine Vents and Drains -Inspection/Check.

 S 862-044-N00

 (2)  
Fuel leakage in the cowling is not permitted.

 WARNING: STAY OUT OF THE ENGINE HAZARD AREAS SHOWN IN FIG. 201 WHEN
_______ YOU EXAMINE THE NACELLE. IF YOU DO NOT STAY OUT OF THE ENGINE HAZARD AREAS, INJURY TO PERSONS OR DAMAGE TO EQUIPMENT CAN OCCUR.
 (a)  You can see the fuel leakage in the cowling during an engine start.
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(b)  
The fuel leakage is a fog-like spray off the bottom of the aft lip of the turbine exhaust sleeve.

 (c)  
If you look at the aft part of the nacelle during an engine start, you can see the fuel leakage.

 (d)  
If you see signs of fuel leakage, you must stop the engine start, or do the engine shutdown procedure if you started the engine.

 (e)  
Do not start or operate the engine until you find and correct the cause of the fuel leakage.

 I. Ignition Ground Use Limits
 S 862-045-N00
 (1)  
Keep the ignition off during all ground maintenance operation after the engine is started. This will keep a possible overtemperature condition to a minimum if there is a compressor stall.

 J.
Vibration Guidelines

 NOTE: The vibration indication can have small changes when the engine
____ is at a stable speed. This vibration guideline is for an average vibration value of an engine that is at a stable speed.
 S 862-080-N00
 CAUTION: USE THIS VIBRATION GUIDELINE ONLY FOR THE GROUND TEST OF THE
_______ ENGINES DURING MAINTENANCE. THE VIBRATION GUIDELINE IS NOT FOR FLIGHT OPERATIONS.
 (1)  The maximum vibration guideline of the engine for continuous operation is as follows for broadband and tracked vibration:
 NOTE: If you do the trim balance procedure (AMM 72-31-00/501), use
____ the vibration limits shown in that procedure.
 (a)  N1 - 4.0 units (4.0 mils single amplitude)
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