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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > N54 Bad Cylinder Head



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      04-26-2015, 10:00 PM   #1
Josue335i
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N54 Bad Cylinder Head

HI, I have a 2007 BMW 335i coupe. (08/2006 Fabrication date). The car was took to the dealer to verify the well known misfire issue on cylinder 6. The diagnostic said that the issue was the fuel injectors. I said OK, change it. After that, on the same week they are now telling me that the holes for the injectors on the head are bad(too big and the injectors does not fit) and that the head does not repair at all and needs to be changed. Have this ever happened to anybody??? Is that even possible???
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      04-27-2015, 12:25 AM   #2
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Yup...that has happened.

If the injectors were installed without the stabilizing ring it affects the roundness of the bore they fit into.

Once it goes out of round.....seems you have to replace the entire cylinder head.

Lots of guys on here post that when they change their injectors only to find the rings were missing on the old ones.
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      04-27-2015, 10:12 AM   #3
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Quote:
Originally Posted by Ilma View Post
Yup...that has happened.

If the injectors were installed without the stabilizing ring it affects the roundness of the bore they fit into.

Once it goes out of round.....seems you have to replace the entire cylinder head.

Lots of guys on here post that when they change their injectors only to find the rings were missing on the old ones.
This is correct and the sad part is the dealer will not take any responsibility even though they were installed incorrectly. I wonder if the injector doc's seals would make up for this ? i know his are slightly larger than oem .Don't know if this has ever been discussed his seals and new couplers might make for a temp fix .
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      04-27-2015, 01:01 PM   #4
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Thanks for the info!!! Bad luck!!! Does anybody know the price for a good used n54 cylinder head? Is that repairable?
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      04-27-2015, 01:52 PM   #5
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Happened to me: http://www.e90post.com/forums/showthread.php?t=729823
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      04-27-2015, 02:12 PM   #6
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This also happens from prying them out incorrectly and pounding them in at an angle with an old seal.
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      04-27-2015, 06:29 PM   #7
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installing the injector hold down brackets upside down also does it. it allows the injector to bounce around and it eventually bores out the hole too much
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      04-27-2015, 10:34 PM   #8
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It's expensive. a new head gasket is like 3,000 installed. throw in the price of the head....
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      11-15-2017, 05:03 PM   #9
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Bumping this thread.

In the midst of having Pure Stg 2s installed, i ran into this issue. My mechanic found that two injectors were missing the decoupling element when installed. No misfires, no issues in the 50k or so, so i was probably on borrowed time?

Anyways what are my options with the old cylinder head with injector holes out of spec?
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      11-15-2017, 09:22 PM   #10
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Lshaw if you removed the injectors make sure that you reinstalled them with decouplers and new deals. There is a solution that doesn't involve head replacement. Hopefully all will be ok and won't come to any of that.
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      11-15-2017, 09:25 PM   #11
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Quote:
Originally Posted by feuer View Post
Lshaw if you removed the injectors make sure that you reinstalled them with decouplers and new Seals. There is a solution that doesn't involve head replacement. Hopefully all will be ok and won't come to any of that.
?
As in new teflon Orings?
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      11-15-2017, 10:29 PM   #12
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Quote:
Originally Posted by 335e92tx View Post
?
As in new teflon Orings?
No. No need as it will burn anyhow from combustion traveling up past the injector tip if the injector hole is enlarged. First step would be copper crash washer/seal from Diesel engine injector. This will seal off the combustion from escaping into the atmosphere. The decouplers don't offer this.
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      11-16-2017, 02:47 PM   #13
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Quote:
Originally Posted by feuer View Post
Lshaw if you removed the injectors make sure that you reinstalled them with decouplers and new deals. There is a solution that doesn't involve head replacement. Hopefully all will be ok and won't come to any of that.
It was over 50k or so with the injector fused in, the injector was moving quite freely. Had no choice but to replace the head...


Is the old head worth anything?
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      11-16-2017, 03:33 PM   #14
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Quote:
Originally Posted by Lshaw View Post
It was over 50k or so with the injector fused in, the injector was moving quite freely. Had no choice but to replace the head...


Is the old head worth anything?
Was it misfiring? Try to sell it for parts, unless you moved everything over onto the replacement head.
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