How to pull the injector seals on a 1973.5 CIS engine

[jdm72911]

Does anyone want to give me advice on pulling the seals safely from a 1973.5 911T with CIS injection? Any help would be appreciated. This is my first time pulling the seals from a 1973.5.

[gazzerr]

Safest way is to remove the intake runner and tap them out with a tapered socket from the intake side. That's how I did it.

[jdm72911]

These are the early type that are not inserted into the intake runners. It might be a good idea to pull the intake runner anyway to make sure nothing falls down around the intake valve or enters the combustion chamber. Still looking advice if someone has changed the early type.

Thanks

[T77911S]

seals or the sleeve?

the seal is easy. if you have the flexible fuel lines you can leave them on.
put a wrench on the narrow part of the injector and use it to pry the injector out.
the seal or Oring may come out or stay in. just pop it out.

for the sleeves you need to remove the intake

[Flojo]

Originally Posted by gazzerr

Safest way is to remove the intake runner and tap them out with a tapered socket from the intake side. That's how I did it.

correct. did the same.
I feared that the runners were brittle and might break and debrits could fall into the cylinder.

[jdm72911]

1973.5 has a one piece seal that firmly inserts into a metal cup fixed to the head and not the intake. My plan is to pull the intake runners and put a small rag into the intake port to make sure nothing breaks away and falls into the combustion chamber. I have several small ID bearing pullers that should fit to extract the seals. Please let me know if someone has a better and safer way of doing this. Thanks in advance for any advice!

[Sunroof]

I changed out my injectors a few years ago on my 1973.5T and ended up with bleeding knuckles and little patience!!!! The injectors were changed on the 1974 model where they were inserted in the intake runner unlike the 73.5T's cylinder heads. The 1974's onward has to be a breeze!

You need a prying tool at a minimum. I used a screw on nut fabricated with a welded ring on top to pull while prying the damn things out. I no longer have this piece unfortunately. Its the rubber seal that swells around the injector that makes removal a very timely and tough job; or at least in my case. Like trying to remove a liter sized bottle out of someone's ass! Accessibility is key in order to get the pry tool under the lip of the injector then pry out without impacting the cylinder head. Surprisingly, the new ones were easy to install by just pushing them in.

Not great news from my experience, but I got them all changed out and the new ones improved performance.

Try a pry tool first and if you find that does not help then you might consider having a shop perform this work to save you the frustration. That's about the best advice I can offer. Another quirky thing about the 1973.5T.

Good luck

Bob

[jdm72911]

Thanks for sharing your experience even though it is not all good. You have given me enough insight to fabricate an adapter to facilitate the removal. I will let you all know how it works out.

Thanks

[Sunroof]

Your welcome!

Be patient, start with the drivers side first since accessibility is easier here. I used a small pry tool and a piece of wood under it to provide more leverage and a better prying angle. The screw cap with lanyard on the top of the injector was extremely helpful to pull it along.....pry-pull..pry..pull. Protect those injector lines and get them out of the way! Disconnect the battery, wear tough gloves and your on your way.

Bob
1973.5T

[LakeCleElum]

I have a 73.5 for 27 years.....Do what T77911S said. He nails it. The wrench is just a spacer to give your pry tool some leverage. I have 5 new injectors for 73.5 if you find one you can't clean.

[Flojo]

..

[john walker's workshop]

You don't want to pry against the soft metal sleeve or it will get chewed up, like in the pic. Somebody obviously tried to get this one out previously. Use something with a 90 degree end and get it in and under the bottom of the seal and pull and wiggle the damn thing out. They don't come easy. I pulled a head off the shelf and used an offset screwdriver and visegrips.

[4wdbus]

I realize that this is an old thread, but wanted to share my method to remove these rubber seals...

First remove the fuel lines from the injectors. Then I use 3 old feeler gauge blades inserted around the circumfrence of the rubber seal, between the seal and the aluminum insert in the head. The blades are slightly curved and after I get one inserted, then insert the next behind it and drag around 120 degrees with some needle nose pliers while holding it down. After I get 3 blades spaced around the seal to bypass the barb on the aluminum insert, then I attach my CIS pressure tester hose to the injector and give it a good yank (or could pry it out with 12mm box end wrench). It's a good idea to hold a rag around the injector when pulling so the blades don't get lost. This pulls out the injector and rubber seal together. From there you can slip the rubber seal off the injector with a small screwdriver inserted at the top and a drop of oil.