I have two injectors that are no good( io550F) I am finding is that you have to buy a whole set?I only need two.Anybody rebuild these things or sell one at a time.? Anyone ,,,, anyone.... Bueller ,,,, bueller

Depends on the age of the engine. Early in production, Continental equipped them with all injectors the same in all cylinders. More recently, they've taken a clue from the GAMI guys and started equipping each cylinder with a different size nozzle.

Maybe call COntinental or GAMI.

MTV

I was talking to Eric at Western Skyways the other day about an injected engine. He said they do about the same thing as GAMI. I've got no real good knowledge as some of these other guys like MTV but I'd think you would want to be careful and have them matched so's you don't have a rough running motor.

How are the injectors bad? I use the JPI and measure the injectors with small drill bits and match the injectors so the cylinders peak at the same time. I would be happy to pay the shipping for your "bad" injectors. If you ever see them flow it is just a stream that hits the intake valve boss creating a spash. Not very scientific.

The black sleeve on them is coming off. My mech says they are bad . I'm no injector wizard so I am going with what he says.The plane sat for about 5 years and when I bought it there was all sorts of stuff that we found in the fuel screens ect. We drained the tanks , flushed them out, cleaned the injectors, fuel screens ect.... It ran ok for about 10 hrs then we think morrstuff plugged it up again.Pretty frustrated at this point. Running really bad . Compressions are all good . Hopping it is just fuel contamination and that she will purr when we put it back together.

Don't get discouraged, you are most likely correct that it is just more gunk coming through the system. That said, I'd get the whole system drained and cleaned as much as possible. Injectors, as the man says, are NOT rocket science, but those holes in them are really tiny, and so even a little blockage can create havoc of the type you describe.

I flew a brand new Cessna 185 once, and that airplane would foul an injector every 20 hours or so. We'd pull the fuel screens and they'd be full of a white fibrous material, like tiny threads, and some of those would get through the screen and foul an injector. I got pretty good at landing out, pulling the cowling and figuring out which cylinder's injector was fouled, pulling that injector and cleaning it, all whilst bobbing around in some lake or other. This went on for some 200 hours or so. We checked the fuel tanks (wet wings) and couldn't find anything....grrrrr. Brand new airplane.

Much later, I talked to a guy who built those airplanes for Cessna, and told him the story. He told me the white fibrous material was likely from one of the rags that they use to smooth out and apply the tank sealant. His guess was that one or more of those rags was left in a tank, covered by the black goo they call the sealant, so it was virtually invisible inside the wing, and the thing was gradually breaking down and going through the fuel system.

After a couple hundred hours, it all stopped, so it was apparently all gone.

MTV

the gunk in the fuel injector screens is from the air not the fuel. At part throttle or by venturi effect the injector pulls air to help atomize the fuel. To clean the injectors is to put them in an ultrasonic cleaner. The black cover is just swadged on. On the TSIO injectors you take it off. Ill Repair and use those injectors. I guess I already have a bag full of injectors. The fuel injectors are a matched set from Bendix? TCM? once you get a different size injector in the mix the analog fuel flow (pressure) gauge is less accurate.

They appear to be a set of Gamis .Its a Texas skyways motor....The injectors have bean cleaned its just the black sleeves on two of them came loose.I cannot see how anything else would need fixing on them.How do you put the sleeve back on there?.....Tanks have been drained and flushed out.Screens and fuel bowl are clean,putting new gas in it. Just need some holy water on my two injectors.Then hopefully she will purr.

The GAMI injectors are all different nozzle sizes, you need to ensure that you get the right size in the right cylinder.

MTV

Skydive206 wrote:the gunk in the fuel injector screens is from the air not the fuel.

Oh, trust me--gunk in your fuel can and will foul injectors.

MTV

Yep, copy that, on getting the right size .........

Yes Gunk in your fuel will foul injectors. I thought he was talking about the screens on the fuel injector that he could see with the shield off. The screens (Air side) get fuel stained, dirty, and even debris but I havent seen a change in the performance of the injector. With the JPI I have seen a Cyl all of a sudden go lean, Pulled the injector and could see the smallest fiber across the hole inside on the fuel side of the injector.