71-00Page 704 Minimum Alcohol-Water Mixtures Figure 702 501 May 15/80
BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.
(9)
Shut off water or water/alcohol, release starter and let engine stop. Allow engine to drain for 5 minutes to eliminate excess water.
NOTE: Observe starter limitations.
(10)
Repeat steps (7) thru (9) as required, based on operator's experience.
(11)
Remove water wash rig and inspect inlet guide vanes.
(12)
Remove cap and connect generator cooling inlet (aft) supply duct.
(13)
Reactivate ignition circuit breaker.
(14)
Check fuel control PB sense line water trap for moisture
(15)
Conduct after wash functional check of engines and systems as follows:
(a)
Select engine driven generator OFF and ensure NO. 1 or No. 2 generator manual trip lights on annunciator panel M238 illuminate.
(b)
Start engine and run at idle for 5 minutes.
(c)
Select engine driven generator ON BUS, and check output.
(d)
Exercise anti-ice system valves.
CAUTION: DO NOT EXCEED GROUND STATIC EGT OPERATIONAL LIMITS WHEN USING ANTI-ICING AIR SYSTEM.
NOTE: Under very cold and windy weather conditions, even if water/alcohol mixture is used, there is a high probability of ice formation in the engine in less than 4 hours if an engine run-up is not made following wash to purge/evaporate residual water.
(e)
Exercise air conditioning system valves and run air conditioning system in full cold mode to allow all undrained water to exit through water separator.
(f)
If desired, carry out performance check.
(16)
Shut down engine and recheck fuel control PB sense line water trap for condensation.
(17)
Open applicable air conditioning equipment bay door, remove drain cap from duct pressure transmitter sensing line (Ref 36-21-11, R/I) and drain out any water. Reinstall cap and close bay door.
E. Clean Engine - Turbine Water Wash Procedure (optional)
NOTE: The following optional water wash procedure may be utilized as required to retard turbine sulfidation attack.
(1)
Shut down engine and allow at least 30 minutes to elapse before washing engine.
(2)
Deactivate ignition circuit breaker for engine being washed.
(3)
Check that start lever is in CUTOFF position.
(4)
Check that all anti-ice and fuel heater valves are in CLOSED position, except engine bleed valve.
(5)
Disconnect both igniter plug leads and remove packing holders from igniter plug bosses. Unscrew and remove igniter plugs (Ref 74-21- 21).
(6)
Insert PWA 33594 Water Wash Probe (Fig. 703) in each igniter probe boss and extend each probe into No. 4 or 7 combustion chamber as follows:
(a)
Slide rubber stopper toward connector end of probe to allow full insertion of probe into combustion section.
(b)
Insert probe into right or left side fan duct igniter plug boss, through combustion chamber outer case boss, and into combustion chamber (No. 4 or 7 chamber, as applicable).
(c)
Move probe inward carefully, until tip of probe is felt to contact inner surface of combustion chamber. Withdraw probe approximately 1/4 inch so that probe tip does not contact combustion chamber wall (Fig. 703).
(d)
Slide rubber stopper down tube of probe until stopper can be firmly inserted in igniter plug boss at fan duct. Ensure that probe is still correctly positioned, with black mark on outer end of probe tube facing rearward.
NOTE: Once stopper is correctly positioned, probe can be used on left or right side of any JT8D engine without further adjustment, but it is recommended that position of probe be frequently checked as directed.
(e)
Insert second probe in igniter plug boss on other side of engine and adjust position in same manner as for first probe.
(f)
Connect water hose to each of probe hose connections and connect hose to source of clean, drinking-quality water capable of at least 40-psi pressure. If engine is to be cleaned during freezing temperature conditions, add sufficient alcohol to the wash water to ensure no ice forms that could cause damage to the engine. See Fig. 702 for recommended minimum water-alcohol mixtures. However, a mixture of up to 50% alcohol may be used.
501
Jun 20/85 BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details. 71-00 Page 705
CAUTION: SPRAYING WATER INTO GAS PATH BEFORE ENGINE HAS COOLED, CAN RESULT IN DAMAGE TO ENGINE PARTS DUE TO EXTREME THERMAL CYCLING.
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