Is it safe to open the 1985 Civic 1.5Si injectors for clening?

[eintsius]

I don´t like the idea of cleaning the injectors with fuel additives. So i would like to disassemble the injectors and then open them for hand cleaning with acetone. Has anyone done it? Is it safe to open them? Or are there any parts inside which will brake or malfunction after reassembling?

Thanks in Advance,
Henrik

[lxndr]

The injectors are sealed. There is no way to open them without breaking them.

[eintsius]

Thanks fof that tip. So ill have to do it with flushing. I´ve read on the internet, that acetone wont damage them, when it is used for cleaning? Has anyone experiences?

[lxndr]

Hmmm...

Acetone softens and melts plastic. Both the top and the tip of the injector are made of plastic. It's your call.

[eintsius]

So the only option is to use the special liquids for that?

[lxndr]

Why are you so opposed to putting a bottle of injector cleaner in your tank?

[eintsius]

Im swapping injection on to carburatteur engine. The injection engine is allready taken into pieces. The cylinder head gasket is at my home right now. I'm cleaning it by hand. I thought, that i'll clean the injectors too with my own hands - gives better confidence.
I bought the fuel additive. I have the fuel pump also at home. Maybe i can use the concentrate with a little amount of gasoline to clean the injectors at home? I ve allready mounted the pump on to the tip of the injector. Reversed flow should clean tiny fuel filter inside the injector. And after that right direction flushing should clean the injector completely. Or is it a dumb idea?

[lxndr]

The little filter inside the injector pops right out.

Sorry, but I think this is a dumb idea.

You'll also need to hook the injector up to a power supply in order to open them so your "concentrate" can flow through them. Do you know how an injector works? The injector is essentially an electro magnet, a pulse of voltage causes the injector to open momentarily. The opening of the injector is done with either a pintle or a plate. A pintle is essentially a pin that pulses in and out of the tip of the injector, similar to a clickable ball point pen. A plate spins to reveal tiny holes for the fuel to flow through.

Hooking the injectors backwards to a fuel pump just sounds bad for several reasons:
1) You'll probably damage the injectors because they're designed to flow in one direction
2) You have no way to regulate fuel pressure through the injector
3) You need current to the injectors in order to open them
4) Fuel + spark (wires to the injector) = boom

There are shops that specialize in cleaning injectors, look one up in your local phone book.

If you still want to try it, don't let me stop you. I look forward to reading about you in the Darwin awards.

[eintsius]

The electrical part im not concerned about, im pretty experienced at this point.The preacutions against explosion are: all connections(except the connector to injector)are soldered, ventilated room,sealed(waterresist-also air tight) switches.To protect the solenoid: im using suitable resistorpack. I´m using an 12V switching power supply, which goes up to 3A(the original fuse for fuel pump is up to 10A). So the pump cannot achieve very high power(<36W), i dont think, that it even reaches the operating pressure 2,5bar.
I have an cutaway view of the injector in the user manual. Only problem is, that it doesnt display the materials used in it. The steel and other metal parts can handle pretty high pressure, but the plastic (and perhaps some rubber seals?) is what concernes me. Actually i remembered that an efect called hydraulic shock(i dont know the excact phrase for it in english, im estonian) causes the pressure rise at the closing point about even 10 times for a very little time. So injectors should have pretty big strength reserve. Allthough theory is correct, i´m still unconfident, because im doing it for the first time, prhaps im missing something?
The workshops near my location ask too much money for it, i actually can buy other functional cylinder head gasket for that money.