[Bmwfixerguy]

Also do you work for The dealer? What dealer are you at? I'm in south jersey.. Your in Chicago right?
I lived there 2 years

[feuer]

Originally Posted by Bmwfixerguy

Also do you work for The dealer? What dealer are you at? I'm in south jersey.. Your in Chicago right?
I lived there 2 years

No, no, I work as a service writer in a fleet maintenance company and occasionally turn wrenches at VT on Elston & Milwaukee in Edgebrook. What neighborhood did you live in?

[Bmwfixerguy]

Originally Posted by feuer

No, no, I work as a service writer in a fleet maintenance company and occasionally turn wrenches at VT on Elston & Milwaukee in Edgebrook. What neighborhood did you live in?

I lived in the burbs in 2000.. Glendale heights (went to uti)
Then I lived by ohare.. Basically city limits..

I was born and raised in South jeset a stones throw from Philly...

[itsmy335i]

Need a little help here man.. so last month i replaced my injector o ring and coupler. the injector is snugged. but today same shit. the bracket that hold the injector broke and the fuel rail was about to break again. what can cause this!? i have no misfire or engine code. could it be bad injector?

[Bmwfixerguy]

Originally Posted by itsmy335i

Need a little help here man.. so last month i replaced my injector o ring and coupler. the injector is snugged. but today same shit. the bracket that hold the injector broke and the fuel rail was about to break again. what can cause this!? i have no misfire or engine code. could it be bad injector?

Be more descriptive and deff pics if you can...
I have never seen one break like evet!

[Bmwfixerguy]

Originally Posted by itsmy335i

Need a little help here man.. so last month i replaced my injector o ring and coupler. the injector is snugged. but today same shit. the bracket that hold the injector broke and the fuel rail was about to break again. what can cause this!? i have no misfire or engine code. could it be bad injector?

The only thing I can think is the injector was not fully seated and then cylinder pressure pushed it out...

[Velocity26]

Or the injector tunnel is eroded out and the seal is not holding it tightly in place.

[Bmwfixerguy]

Originally Posted by Velocity26

Or the injector tunnel is eroded out and the seal is not holding it tightly in place.

The only way they become eroded is from being improperly installed in the first place...

[feuer]

Originally Posted by Velocity26

Or the injector tunnel is eroded out and the seal is not holding it tightly in place.

that has NOTHING to do with the injector being pushed up by engine compression.

Originally Posted by Bmwfixerguy

The only way they become eroded is from being improperly installed in the first place...

Very true! This guy problem is the bolt that fastens the plate down or the tread hole in the head. Either cross threaded, enlarged or both. Also, could be just not properly installed.

[Velocity26]

A lot of people believe that you can remove injectors and replace them without replacing the seals. This leads to the erosion that could be the root of his problem. I have no idea what has been done in the history of his vehicle, but I can tell you that my injectors took significant force to pull them out of the bore. Thank goodness I had access to the professional tool used to extract BMW injectors.

[itsmy335i]

Would you recommend Teflon tape or double decoupler? The injector were properly installed. Don't know if the injector port is ovaled. But it's the same cylinder

[feuer]

Originally Posted by Velocity26

A lot of people believe that you can remove injectors and replace them without replacing the seals. This leads to the erosion that could be the root of his problem. I have no idea what has been done in the history of his vehicle, but I can tell you that my injectors took significant force to pull them out of the bore. Thank goodness I had access to the professional tool used to extract BMW injectors.

Neither the Teflon seal nor the decoupler holds the injector in place. Please understand this.

Originally Posted by itsmy335i

Would you recommend Teflon tape or double decoupler? The injector were properly installed. Don't know if the injector port is ovaled. But it's the same cylinder

You said the plate broke ??? I highly doubt it broke. Probably the bolt does not keep it down.

[Velocity26]

feuer:

A properly sealed injector only exposes the area on the tip to the pressures trying to eject it. An injector with a failed seal exposes a much larger surface area to the pressure that attempts to eject it. The same pressure, acting against a much larger surface area, exerts a much larger force upon the injector.

A failed seal exposes an area corresponding to the diameter of the injector tube (including the decoupler) to the combustion pressures. That might be enough to break the plate.

[itsmy335i]

I will snap a video to show you the injector is loose and take pic of the plate when I get home

[feuer]

Originally Posted by Velocity26

feuer:

A properly sealed injector only exposes the area on the tip to the pressures trying to eject it. An injector with a failed seal exposes a much larger surface area to the pressure that attempts to eject it. The same pressure, acting against a much larger surface area, exerts a much larger force upon the injector.

A failed seal exposes an area corresponding to the diameter of the injector tube (including the decoupler) to the combustion pressures. That might be enough to break the plate.

Absolutely not. No seal > less pressure.
Is the bolt and the plate that keeps the injector down.
Regarding you analogy look at the at diesel injectors. 335d has very similar head and the copper seal is not on the tip.
Also, that is how you fix n54 with enlarged bore for the injector. You install the Piezos with copper seal.

[Velocity26]

I don't know if you get the concept of PSI, but the larger the surface the more force it exerts for equal pressure. If the pressure gets past the seal, it is still facing the decoupler.

There is another thread here where the guy removes an injector with no seal on the end, the bottom half of the injector is solid black from carbon while everything outside of the decoupler looks perfectly normal. The decoupler held the pressure pretty well.

[feuer]

Originally Posted by Velocity26

I don't know if you get the concept of PSI, but the larger the surface the more force it exerts for equal pressure. If the pressure gets past the seal, it is still facing the decoupler.

There is another thread here where the guy removes an injector with no seal on the end, the bottom half of the injector is solid black from carbon while everything outside of the decoupler looks perfectly normal. The decoupler held the pressure pretty well.

Yes, I do not get a lot of concepts, not just PSI...
This is like increasing the brake pad size would increase the clamping force, correct?
Anyhow, said thread will tells you that the injectors misfire not injector that pop out of place.

[itsmy335i]

Originally Posted by feuer

Absolutely not. No seal > less pressure.
Is the bolt and the plate that keeps the injector down.
Regarding you analogy look at the at diesel injectors. 335d has very similar head and the copper seal is not on the tip.
Also, that is how you fix n54 with enlarged bore for the injector. You install the Piezos with copper seal.

Any parts number?

[feuer]

Originally Posted by itsmy335i

Any parts number?

For the copper seal?
WX-3593874
W0133-1778013-ELR

[itsmy335i]

So if the bore is bigger than buy these copper seal and it will fix the issue?

[feuer]

Originally Posted by itsmy335i

So if the bore is bigger than buy these copper seal and it will fix the issue?

It is a job for experience mechanic, with diesels specifically. I would not let just any shop attempt to mantle the affair.

[itsmy335i]

View post on imgur.com

View post on imgur.com

Image of the injector and bracket