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2Addicts | BMW 2-Series forum Technical Topics B58 (M240i) Engine, Transmission, Exhaust, Tuning Head Gasket

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      03-04-2022, 03:43 PM   #1
MrShowOff
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Head Gasket

Blown Head Gasket?
2017 M240i with 50,500 miles. Many bolt on mods. Stock turbo. Dinan tune. Car was at idol for about 15 minutes. Heard a loud whistle sound. Less than 5 minutes later heavy white and gray smoke pouring out of tail pipes. Any ideas?
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Last edited by MrShowOff; 03-04-2022 at 03:49 PM..
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      03-04-2022, 06:50 PM   #2
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Sounds more like a blown turbo than headgasket, with coolant and oil leaking past the bearings, as you don't normally get any noise with a blown headgasket. Could also be the intake charge cooler, too, which is a known failure area.
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      03-05-2022, 10:35 AM   #3
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Yeah, hopefully its the turbo.
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      03-06-2022, 03:04 PM   #4
freakystyly
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Some people have had valve cover failures after long idling. I think it's more PCV related than the actual cover.

How's the coolant looking?

Somewhere in this thread, there's a couple https://f30.bimmerpost.com/forums/sh...292652&page=33
https://f30.bimmerpost.com/forums/sh....php?t=1829682
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      09-16-2023, 11:21 AM   #5
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Did you ever figure out what this issue was?? My 17 M240 just did the exact same thing last week.
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      09-16-2023, 04:21 PM   #6
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Quote:
Originally Posted by RedDedFred View Post
Did you ever figure out what this issue was?? My 17 M240 just did the exact same thing last week.
Pcv diaphragm.. its always what it is
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      10-01-2023, 09:53 PM   #7
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Quote:
Originally Posted by n55david View Post
Pcv diaphragm.. its always what it is
You called it. Thatís exactly what it was.
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      10-02-2023, 11:55 AM   #8
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I just put the ross racing occ/ pcv delete kit on the other week, motivated by this exact fear.
Mine is a 2017 with 61k
Diaphragm looked suspect when I took it out.
A little tugging on it and it ripped too easy.
Did this in prep for a drag race night as I knew it would be long stop and go idling in the staging lane.
I definitely suggest everyone consider this somehow in their routine maintenance.
At least refresh the diaphragm at a minimum
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      10-02-2023, 03:23 PM   #9
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Iím wondering is the issue affects MY 2021 or just older m240iís
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      10-02-2023, 05:16 PM   #10
Dantesboyz
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Specific for the gen 1 b58 2016-2020ish
I'm pretty sure the TU engine has an entirely different valve cover and ventilation system.
If it's a weakness still?... hopefully one of the TU guys jump in and confirm.
Kern417 on here has good information on YT, just search b58 pcv
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      10-02-2023, 07:09 PM   #11
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Given your mileage, it sounds like the PCV. It's a thin membrane that gets brittle and breaks over time.

I had the same issue. Google up B58 PCV diaphragm replacement and do it; solved the problem for me. Only hard part is prying the cap off if you want to reuse it. Otherwise, much faster to just break it off and snap on a new one.
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      10-03-2023, 06:31 PM   #12
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Quote:
Originally Posted by Dantesboyz View Post
I just put the ross racing occ/ pcv delete kit on the other week, motivated by this exact fear.
Mine is a 2017 with 61k
Diaphragm looked suspect when I took it out.
A little tugging on it and it ripped too easy.
Did this in prep for a drag race night as I knew it would be long stop and go idling in the staging lane.
I definitely suggest everyone consider this somehow in their routine maintenance.
At least refresh the diaphragm at a minimum
Idling in the tech lanes at the 1/4 mile strip for 2 hours is what did mine in. 54k miles. Wish I had known about the pcv issues beforehand.
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      10-04-2023, 04:05 PM   #13
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Any PVC replacement options sources to prefer or avoid? Is OEM the best or is anything better out there?
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      10-05-2023, 11:10 AM   #14
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You can delete the OEM cap all together and have it vent to atmosphere. I bought the basic one with no catch can.

https://www.rossrperformance.com/pro...lete-version-1
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      10-06-2023, 09:28 AM   #15
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Quote:
Originally Posted by N7 Arron View Post
You can delete the OEM cap all together and have it vent to atmosphere. I bought the basic one with no catch can.

https://www.rossrperformance.com/pro...lete-version-1
It may not be emissions compliant.
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      10-06-2023, 10:06 AM   #16
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Correct. I dont have inspections in my state, forgot all about that. Its easy to remove put the oem cap back on for testing if someone wanted to go that route.
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