Engine - Textron Cessna Grand Caravan Ex 208B Pilot's Operating Handbook And Faa Approved Airplane Flight Manual

SECTION 8 CESSNA
AIRPLANE HANDLING, SERVICE MODEL 208B 867 SHP
AND MAINTENANCE GARMIN G1000
CLEANING AND CARE
(Continued)

ENGINE

ENGINE EXTERIOR/COMPARTMENT CLEANING
The engine exterior and compartment may be cleaned, using a suitable
solvent, in accordance with instructions in the airplane Maintenance
Manual. Most efficient cleaning is done using a spray type cleaner.
Before spray cleaning, ensure that protection is afforded for
components which might be adversely affected by the solvent. Refer to
the 208 Maintenance Manual, Chapter 12-22-01, External - Cleaning/
Painting for approved cleaning procedures and Chapter 12-21-05,
Engine Control Rod Ends - Servicing, for information on proper
lubrication of controls and components after engine cleaning.
ENGINE COMPRESSOR WASH
The benefits of performance improvements and increased service life
of hot section parts accruing from instituting a regular compressor wash
program cannot be overemphasized. Compressor blade wash is
accomplished to remove deposit buildup accumulated on compressor
blades during normal operation. A compressor wash ring is installed on
the top of the engine adjacent to the induction air inlet screen to
facilitate this maintenance program. Refer to 208 Maintenance Manual,
Chapter 71-42-00, Compressor Blade Wash - Maintenance Practices,
for approved washing procedures.
Compressor washes can be performed by either motoring the engine
with the starter or running the engine. Depending on the nature of the
operating environment and the type of deposits in the engine gas path,
either of the two wash methods can be used to remove salt or dirt and
other baked-on deposits that accumulate over a period of time and
cause engine performance deterioration. When the wash is performed
solely to remove salt deposits, it is known as a "desalination" wash. A
wash performed to remove baked on deposits to improve engine
performance is known as a performance recovery wash. A motoring
wash is conducted at a gas generator RPM of 14-25%; the running
wash is carried out at an N of approximately 60% (23,000 RPM). The
g
water or cleaning mixture and rinsing solution, dependent on ambient
temperature, is injected at different pressure, depending on the wash
method being conducted.
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208BPHCUS-00