[itsmy335i]

n54 Last Friday, when i was driving home i realize i had a fuel leak and then my car started misfiring and check engine light pop up. I got my car tow home. I start taking stuff apart.
1st issue i found my Fuel line from fuel rail to injector had crack.
2nd issue the bracket that hold the injector in place is broken.
After removing the E10 bolt that was holding the bracket, i realizing that my injector on 2nd cylinder have alot of play in it. So i removed injector 1 from cylinder 1 to cylinder 2 and injector 2 to cylinder 1. ** I thought might have a bad port on the head for the fuel injector** so injector 1 in cylinder 2 was snuggy and injector 2 was still loose in both cylinder. So my question to you guys is it the o ring seal that is bad or the decoupling element on injector 2?

Thanks i hope to get some feed back here.

[Velocity26]

More than likely it is the o-ring seal at the end that is bad. The 0-ring is special and is only good for one install and you should not re-use them. When you buy a new injector, the new o-ring is compressed into the groove and held in place by a metal sleeve. Once you remove the metal sleeve, you need to install the injector immediately, as the o-ring starts to expand to seal the injector port. Once the injector is removed, the o-ring seal is broken and it will not seal correctly again.

You should find a local shop that has the tool to install and compress new o-rings and replace the o-rings on all injectors that you have removed. To do it right, you should replace the decoupler too.

[itsmy335i]

You are correct its the o ring seal, i replaced 3 of them along with the Decoupling element

[Bmwfixerguy]

When you say loosely could you pull the inj out by hand very easily like no resistance? Was there exhaust soot on the inj itself...
Also who did the injectors prior and when?
Two parts here, one this could get crazy expensive and maybe need a head.. If the threads are damaged for the head they need to be timecerted, if the injector bore is torched it will need a head..
One you need to considered paying to have this done at the dealer
Two you need to call and have history checked even if you just got the car used no matter what those things don't commit suicide on the regular they usually need human intervention to fail like that..
Why I say call the dealer is you need to know if this had inj out in 10000 miles ago and they need to rectify the work... You need to get the process going now you can't show up with a like if broken parts and say you did this awhile ago you need to fix it lol..
I just put a head on a 750 s63 from a dealer in va from someone notching up a hold down screw

[Velocity26]

If the injector bore has been torched, it can be sleeved to restore it. It entails shipping off the head, but is cheaper than replacing the head with a new one.

I just replaced all 6 injectors and they all required significant force to pull from the bore. Even with the "puller tool" it took effort. If an injector just pulls out easily, by hand, you may have a problem.

[feuer]

I have seen sheared off bolt and stripped thread but never broken hold-down plate.
That is very suspicious.
Bmwfixerguy is correct, you need to pull the work history on the engine.
Not only for this particular issue but to at least have an idea if they butcher something else as well.
There has been successful repairs on bored out injectors port by installing copper injector seal instead of Teflon.
Diesel DI engines all use copper due to the much higher compression.
Anyhow, since the other injector fits snuggle quite possibly you just need new seal.
Be positive, good luck and let us know how if works out.

[Bmwfixerguy]

Originally Posted by feuer

I have seen sheared off bolt and stripped thread but never broken hold-down plate.
That is very suspicious.
Bmwfixerguy is correct, you need to pull the work history on the engine.
Not only for this particular issue but to at least have an idea if they butcher something else as well.
There has been successful repairs on bored out injectors port by installing copper injector seal instead of Teflon.
Diesel DI engines all use copper due to the much higher compression.
Anyhow, since the other injector fits snuggle quite possibly you just need new seal.
Be positive, good luck and let us know how if works out.

Please link me to a post and or supplies on the copper seals they used I'm very intruiged!
I have geared of teamed and sleeved inserts ECT.. I know a guy in Fla does them.
We have been successful with using a timecert for the cross threaded hold down bolts

[Bmwfixerguy]

And that was supposed to say 750 n63 sorry

[feuer]

Originally Posted by Bmwfixerguy

And that was supposed to say 750 n63 sorry

There you go buddy! Glad to help.
http://www.e90post.com/forums/showthread.php?t=1223049
In EU mechanics are way more experienced with DI and also creative :-)

[Velocity26]

Originally Posted by Bmwfixerguy

Please link me to a post and or supplies on the copper seals they used I'm very intruiged!
I have geared of teamed and sleeved inserts ECT.. I know a guy in Fla does them.
We have been successful with using a timecert for the cross threaded hold down bolts

I think ABR in Texas does something similar to how you would deal with worn valve guides ... they bore them out and insert a sleeve that has the correct inner diameter.

[feuer]

Originally Posted by Velocity26

I think ABR in Texas does something similar to how you would deal with worn valve guides ... they bore them out and insert a sleeve that has the correct inner diameter.

True but unfortunately that can not me easily done when the injector hole is enlarged it would be one off job that requires removing the head. At that point one is better off just replacing the piece as is not worth experimenting with head on and off. Adding material on the injector tip is a lot more easier and cheaper too. Honestly I would not recommend to sleeve the enlarged hole.

[Bmwfixerguy]

Very interesting stuff! Can't wait to read through it all... I know a place in Fla uses an insert but like feuer said it's still very labor intensive vs using an oversized seal.. I digested that with one we had at work but no one knew where to obtain one lol

[Bmwfixerguy]

I suggested*

[feuer]

Originally Posted by Bmwfixerguy

I suggested*

335d injector copper seal would be a good candidate.

[Bmwfixerguy]

Originally Posted by feuer

335d injector copper seal would be a good candidate.

I have a tool box draw full of thwm too... Its a very hefty I ring it acts as the decoupling unit on a pezo injector. Im gonna look into that tomorrow When we get slow...
I still can't wrap my head totally around it.. It can't possibly look pretty lol

[Bmwfixerguy]

It's the onlynseal on the n57 from what I remember. They slide down over the tip them lay into place and are then tightened down to seal on the washer.. It also possibly uses shims too I'm pretty sure...
Had to do a few carbon and swirl flap cleanings..
If you have ever done one tmyou try to forget as much as possible lol

[feuer]

Originally Posted by Bmwfixerguy

I have a tool box draw full of thwm too... Its a very hefty I ring it acts as the decoupling unit on a pezo injector. Im gonna look into that tomorrow When we get slow...
I still can't wrap my head totally around it.. It can't possibly look pretty lol

It does not have to be sleeve over style like the n54 injectors Teflon seal and be on the tip either. Copper washer works because it gets compressed and changes it shape making a good seal. Just like when used with banjo bolts or drain plugs or all DI diesel injectors.

[Bmwfixerguy]

Originally Posted by feuer

It does not have to be sleeve over style like the n54 injectors Teflon seal and be on the tip either. Copper washer works because it gets compressed and changes it shape making a good seal. Just like when used with banjo bolts or drain plugs or all DI diesel injectors.

Gotcha that makes a little more sense... I was saying it would be nice to have an oversized seal... The only tho g that makes it go bad is the blow by.. If there is no blow by then you find..

[itsmy335i]

Thanks for all these awsome reply. unforutionally the injector were replace at 55k and my car now have 90k on it...but n e who, the seal did the trick, the injector are snugged in place =D

[feuer]

Originally Posted by itsmy335i

Thanks for all these awsome reply. unforutionally the injector were replace at 55k and my car now have 90k on it...but n e who, the seal did the trick, the injector are snugged in place =D

Excellent! That's wonderful news my friend!

[feuer]

Originally Posted by Bmwfixerguy

Gotcha that makes a little more sense... I was saying it would be nice to have an oversized seal... The only tho g that makes it go bad is the blow by.. If there is no blow by then you find..

The injector hole is conus so making a sleeve to insert there would be very difficult. In order for the injector not to dig itself deeper into the head (being pushed down by the lockdown plate) they must be installed with decoupler. The decoupler is design to do just that, not to make a perfect seal. Installing copper seal bellow it should secure good strong seal. As long as is keeping the pressure inside the chamber would be OK. I don't wish this to any n54 owner, However, probably worth a shot before disassembling the head. This should explain it better:

[Bmwfixerguy]

Originally Posted by feuer

The injector hole is conus so making a sleeve to insert there would be very difficult. In order for the injector not to dig itself deeper into the head (being pushed down by the lockdown plate) they must be installed with decoupler. The decoupler is design to do just that, not to make a perfect seal. Installing copper seal bellow it should secure good strong seal. As long as is keeping the pressure inside the chamber would be OK. I don't wish this to any n54 owner, However, probably worth a shot before disassembling the head. This should explain it better:

Yup I've done a whole lot of one (n54 lol) only done the others for carbon cleanings on n57s..
I get how they both seal totally... Your saying they used the decoupled as the seal like you would on any di desiel