I did a search, and there was nothing under "coke wash", so I'm sorry if this topic has already been discussed.
Here's the photographer's remarks ........
"This is a "coke wash" cleaning of a DC-10 engine in progress. Running the engine at idle, a technician will direct a spray of mild abrasive into the engine to clean off deposits that can cause high heat (EGT)."
Photo © Colin T. Ebert
I have a few questions about the procedure of "Coke Wash" cleaning a jet engine.
Is this cleaning only done if required after an inspection of deposits, or is it scheduled maintenance based on the amount of hours the engine has run?
Can a jet engine like the one on the DC-10 in the photo go it's entire life without needing this type of cleaning?
Regarding the mild abrasive that's used, how fine are the particles? Are they smaller than table salt for example?
How do deposits (which I assume means soot in the cumbustion chamber[s] and tailpipe) cause an increase in the engine's exhaust gas temperature (EGT)?
Finally, have any of you maintenance technicians ever done a Coke Wash cleaning?
[Edited 2005-02-22 18:39:09]