GAMIjectors in IO360A3B6D

[PTK]

Quote: jetdriven

Yes.  Correct. It also seems fairly common so I would try that before buying gami injectors.   

[carusoam]

Pk,

Sounds like a two step process.  Clean and try them first.

Changing their position may make too many changes at one time?

Best regards,

-a-

[jetdriven]

Other items of note.  IF you lose the restrictor in the inlet, the injector is ruined. The restrictors are matched to each individual injector. Don't try to remove the cap over the screen. If it comes off fine, but don't try to remove it. Use a clean 6-point deep well socket to remove. Mine took a thin-wall socket as the clearance is minimal. Trying to remove an injector with a socket half-on strips the hex off the injector. CAREFULLY torque these things back in I think it is 60 IN-LB.  Perhaps less. It takes less than you think. They have taper threads and driving them in can distort or break off the injector.   Enjoy the job, you save yourself 700$ on some GAMI's.

[Cruiser]

I think this is a job for an experienced A&P, it doesn't cost much to have him move injectors around and he will properly torque and check for fuel leaks. 

[Shadrach]

I had an "experienced" A&P over-torque and crack all 4 of my injectors... I'll post pics later. 

IF you need to juggle them to get them right so be it, but I would look for intake leakes first. One of the nice things about Lyc 4 cyl is the fact that each cylinder has a devoted intake pipe of approximately the same length. Airflow is pretty even (relatively speaking) therefore as long as the injectors flow the same, it should be in the ballpark.

When we replaced our injectors because of the above mentioned incident it made very little difference in how the airplane ran. It still ran well at all mixture settings and still peaked on the same first and last cylinders. I am not convinced that swapping precisely machined injectors will do much on a Lyc 4 cylinder unless there is another issue. 

[danb35]

Keep in mind that there's an AD on injected Lycoming engines (2002-26-01) that requires the injector lines be inspected whenever you mess with the lines/injectors, and needs to be signed off by an A&P.  Check the GAMI spread first before changing (including cleaning) anything, and you may well find that you don't need to change anything.

[jetdriven]

 

AD 08-14-07

 

Repetitive Inspections

(j) Thereafter, inspect at intervals of 100 hours TIS (not to exceed 110 hours), at each engine overhaul, and after any maintenance has been done on the engine where any clamp (or clamps) on a fuel injector line (or lines) has been disconnected, moved, or loosened, in accordance with paragraph (k) of this AD.

Inspection Criteria

(k) Inspect the fuel injector fuel lines and clamps between the fuel manifold and the fuel injector nozzles, and replace as necessary any fuel injector fuel line and clamp that does not meet all conditions specified in Lycoming Engines MSB No. 342E, dated May 18, 2004.