M57 diesel leak after injector replacement

bimmer414 · 11-30-2023, 07:12 PM

Hi forum,
Recently picked up a deleted M57 for my dad which had an electrical failure of injector #6 a few weeks ago. Pulled it using a homemade slide hammer and installed a brand new Bosch injector. He noticed it was getting smokier and smokier with white unburned diesel vapor. I popped the hood last night and saw that diesel fuel was bubbling from the rear side of injector #6 (see video). I went ahead and pulled the manifold and injector again and saw it was completely fouled with carbon along with the bore. I cleaned the injector body and the bore the best I could with a toothbrush and carb cleaner and replaced the crush washer. Reinstalled it and saw it was bubbling again, although a little less. Does anyone have any suggestions on what to try next?

Leak: https://youtube.com/shorts/q8WqH6-sc8I?feature=share
Bore: https://youtube.com/shorts/Gr9ouet8nGw?feature=share

Tambohamilton · 11-30-2023, 07:32 PM

Both those links are the same.

Looks to me like you could do with *gently* reaming the seat - you don't want to remove metal, but you do need to scrape out all the carbon.

You can pick up a set of reamers cheap. See here @19min:

bimmer414 · 11-30-2023, 07:46 PM

Thanks, I will pick up a set and give it a try. Here is the other video: https://youtube.com/shorts/q8WqH6-sc8I?feature=share

Tambohamilton · 12-01-2023, 02:57 AM

Is that all diesel on top of the valve cover?? I think you need to replace the o-ring on the leak off pipe, where it connects to the injector. Use only a genuine part. And make sure the clip is fully seated when you reinstall.

335dlci · 12-01-2023, 02:05 PM

Man, that video gave me a seizure.. slow down with the camera movement. It's like watching the movie cloverfield..

11-30-2023, 07:12 PM	#1
bimmer414 Private First Class 71 Rep 183 Posts Drives: 2008 M3 E90 Join Date: Jun 2015 Location: Wisconsin iTrader: (0)	M57 diesel leak after injector replacement Hi forum, Recently picked up a deleted M57 for my dad which had an electrical failure of injector #6 a few weeks ago. Pulled it using a homemade slide hammer and installed a brand new Bosch injector. He noticed it was getting smokier and smokier with white unburned diesel vapor. I popped the hood last night and saw that diesel fuel was bubbling from the rear side of injector #6 (see video). I went ahead and pulled the manifold and injector again and saw it was completely fouled with carbon along with the bore. I cleaned the injector body and the bore the best I could with a toothbrush and carb cleaner and replaced the crush washer. Reinstalled it and saw it was bubbling again, although a little less. Does anyone have any suggestions on what to try next? Leak: https://youtube.com/shorts/q8WqH6-sc8I?feature=share Bore: https://youtube.com/shorts/Gr9ouet8nGw?feature=share __________________ 08 E90 M3 - 6MT, Interlagos Blue, no moonroof, tech package, carbon trim, silver interior. ------------------------------------------------------------------- Last edited by bimmer414; 11-30-2023 at 07:45 PM.. Reason: Fixed link
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11-30-2023, 07:32 PM	#2
Tambohamilton Brigadier General 3301 Rep 4,230 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	Both those links are the same. Looks to me like you could do with gently reaming the seat - you don't want to remove metal, but you do need to scrape out all the carbon. You can pick up a set of reamers cheap. See here @19min:
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11-30-2023, 07:46 PM	#3
bimmer414 Private First Class 71 Rep 183 Posts Drives: 2008 M3 E90 Join Date: Jun 2015 Location: Wisconsin iTrader: (0)	Thanks, I will pick up a set and give it a try. Here is the other video: https://youtube.com/shorts/q8WqH6-sc8I?feature=share __________________ 08 E90 M3 - 6MT, Interlagos Blue, no moonroof, tech package, carbon trim, silver interior. -------------------------------------------------------------------
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12-01-2023, 02:57 AM	#4
Tambohamilton Brigadier General 3301 Rep 4,230 Posts Drives: E91 330d Join Date: Apr 2019 Location: Herefordshire iTrader: (0)	Is that all diesel on top of the valve cover?? I think you need to replace the o-ring on the leak off pipe, where it connects to the injector. Use only a genuine part. And make sure the clip is fully seated when you reinstall.
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12-01-2023, 02:05 PM	#5
335dlci Lieutenant Colonel 303 Rep 1,606 Posts Drives: 335d Join Date: Apr 2014 Location: Socal iTrader: (0)	Man, that video gave me a seizure.. slow down with the camera movement. It's like watching the movie cloverfield..
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