John, I'm in the process of looking at my injectors after I did that lean test.  I took out and cleaned #1 which was stamped "12E" and it was dirty inside.  Today, I removed #2 using a modified socket as you talked about.  #2 was filthy but it was also stamped "12E".  Were your injectors marked by cylinder?  Were any IO550 tuned injectors on the list stamped by cylinder or just "12E"?

I note TCM says they need to be removed and cleaned within 300 hours for "airworthiness" (Tuned injectors only) and I have to add that to my annual checks.

Specifically, there is a patten of black that is on the piston side of the nozzle in the area where the spray pattern would expand.   It may affect flow.   Cycles in the ultrasonic brings them back to new looking but it is taking a long time to remove that substance.  I have 768h TT.

On 2013-10-28, at 11:32 AM, John Barrett <jbarrett@carbinge.com> wrote:

Thanks to all for the advice on injector removal/installation without taking off intake pipes.  I was able to handle five of the injectors with a deep socket ¼” drive 7/16” socket turned down to very narrow walls.  The #3 injector required either purchasing the socket referenced by a couple of emails or manufacturing one like it.  I chose to make one using a standard ¼” drive 7/16” socket and a nut.  Had to turn down the walls as before, then drill out the inside of the socket and the nut.  Finally welding the nut to the top of the socket produced an ugly looking but functional tool that is now in my toolbox.

 

Best regards,

John