CIS Fuel Injector Sleeves

[patkeefe]

I have my engine out for electrical work. I pulled the entire CIS off in one piece. I have long overlooked the fact that the fuel injector sleeves are a bit loose, so now is a good time to fix them.

Do they break easily? I can either push them or pull them out. And, more importantly, I suppose there is some sort of seal between the sleeve and the manifold runner? O-ring? Do the sleeves wear, or does the seal degrade? So, do I need new sleeves or just new seals?
TIA
Pat

[timmy2]

The sleeves get brittle with age so I would recommend replacing them.
Each one requires a new O-ring.
With the injectors pulled you should see 3 depressed tangs in the circle around the sleeves that need to be removed to allow sleeve removal.
Most people use a dremel tool to grind them back flush. You will need to re-create them once you install new sleeves and o-rings to keep thee sleeve in place.

[wacko]

How do you re-create them?

[Cooper911SC]

The "tangs" are stakes. The Al. is physically dimpled or dented or staked.

After you install new o rings and sleeves you can use either a semi dull cold chisel or a medium flat blade screwdriver and small hammer to *gently* tap the edge of the port and deform or re-stake it.

This just ensures that the injector/sleeves don't walk back out of the port.

When installing the new sleeves/o rings use a bit of silicone grease on the o rings to get the sleeves to seat into the port.

Cooper

[ArchHibb]

See this thread for pictures of the "tangs"...
Installing injector sleeves

You did not state whether the manifold runners are on or off the engine. If off the engine, removing the plastic sleeves is as easy as using a socket extension from below to tap them up and out. Shouldn't take much force as long as the tangs are ground off. If the manifolds are still on, obviously you need to be very careful nothing falls into the cylinders when removing the sleeves.

My advice is, unless the runner-to-head gaskets have been replaced recently, remove the runners, knock out the injector sleeves, and replace the gaskets while you're at it. They're not expensive.

[patkeefe]

They're off. I wonder if new o-rings will fix the wiggles?

[Walt Fricke]

Patrick - they won't. The sleeves are a close fit, but not a tight one. They have a sort of flat cross section O ring around them, as you will see when you knock them out. You will want to replace that just because you have new sleeves. But the sleeves will still be loose.

And that does not matter. As long as the stakes hold the sleeves in place against the force of the injection trying to push them up (and I don't think it is much of a force), and both O rings (inner plus the fat round cross section one which holds the injector into the sleeve) seal out the atmospheric pressure air in your engine bay, all is good.

The test (too late for that now) of this assembly is to spray some starter fluid or carb cleaner with the engine at idle around the hole in the runner where the sleeve can be seen. If the seals are bad, some of this stuff will be sucked into the runner, and the engine's speed/note will change.

Me, if I can pull out my injectors without also pulling out the sleeve with it, I leave them alone. But if you like replacing things, go ahead. But it is always a good idea to have some new sleeves on hand in case one does come out - yes, they get brittle.

[patkeefe]

Thanks Walt,
My sleeves do indeed stay in when I pull the injectors. I like your advice of leaving them alone.
Pat

[911carl]

Replaced the injectors and injector sleeves today as described by Timmy2 using a Dremel. Worked out very well!