Excessive oil blow by + boost leak, could be PCV?

nate16 · 11-06-2015, 09:27 AM

So I've got a decent amount of blow by on my N55 -- I'd say an almost abnormal amount. I have contemplated getting a catch can but I also am working to chase down a boost leak. I am curious if a failed PCV could cause both and what my options are to replace it.

Thanks,
Nate

AX75F92 · 11-06-2015, 10:03 PM

I just replaced my charge pipe and noticed the inside was coated with oil. Seemed excessive to me, I've read N55 doesn't suffer from blow by issues like the N54. Not sure how much is "normal"...

What lead you to say yours is abnormal?

torr · 11-06-2015, 10:23 PM

Quote:

Originally Posted by nate16

So I've got a decent amount of blow by on my N55 -- I'd say an almost abnormal amount. I have contemplated getting a catch can but I also am working to chase down a boost leak. I am curious if a failed PCV could cause both and what my options are to replace it.

Thanks,
Nate

I'm in the same boat.......... If it's similar to mine it will get worse. My n55 will be completely torn down tomorrow and I'll let you know what I find.

nate16 · 11-08-2015, 09:50 AM

Definitely let me know. I'm ripping out the entire intake system, fmic, hot and cold side piping and checking vac lines today trying to find this boost leak. Did a boost leak test yesterday and found a little leak at the TMAP sensor but I've fixed that now and still same problem.

nate16 · 11-08-2015, 09:51 AM

Quote:

Originally Posted by AX75F92

I just replaced my charge pipe and noticed the inside was coated with oil. Seemed excessive to me, I've read N55 doesn't suffer from blow by issues like the N54. Not sure how much is "normal"...

What lead you to say yours is abnormal?

Just the fact that there's a good amount, almost dripping when i pull the pipes off. It seems like it has an amount similar to reported N54's however, the N55 does not seem to report anything like it.

nate16 · 11-08-2015, 09:53 AM

I'll take some pics when I pull the whole charge air system out today.

nate16 · 11-08-2015, 05:21 PM

Forgot to take pics lol but found my boost leak. It is the joint where the turbo connects to the fmic piping. There's a little gasket in there that's not properly sealing. BMW doesn't even list the part number for it but I think I found the exact same one but off an F30. Going to try that part first then buy the whole pipe if I can't get the gasket by itself.

sy2767 · 11-09-2015, 07:13 PM

And the oil issue?

nate16 · 11-09-2015, 11:16 PM

Oil issue is unresolved still... Pulled the fmic piping again today, not worse or better, starting to think it's normal and will just grab a catch can

torr · 11-10-2015, 03:55 PM

I managed to get my engine completely disassembled and believe my excessive blow-by oil/consumption is the result of a bent #6 rod. Valves, cylinders, rings and pistons are all looking good.

sy2767 · 11-14-2015, 08:06 AM

Quote:

Originally Posted by torr

I managed to get my engine completely disassembled and believe my excessive blow-by oil/consumption is the result of a bent #6 rod. Valves, cylinders, rings and pistons are all looking good.

Please educate me on how a bent rod can cause this.

weehe126 · 11-14-2015, 04:54 PM

Quote:

Originally Posted by sy2767

Please educate me on how a bent rod can cause this.

A bent rod will cause the piston to sit slightly off and let oil past the rings.

Mdilo · 09-14-2022, 07:39 AM

Quote:

Originally Posted by torr

I managed to get my engine completely disassembled and believe my excessive blow-by oil/consumption is the result of a bent #6 rod. Valves, cylinders, rings and pistons are all looking good.

I know this is super old post but did you replace #6 rod? Was that the cause of the excessive oil blow by?

11-06-2015, 09:27 AM	#1
nate16 Banned 172 Rep 327 Posts Drives: 2017 F80 YMB ZCP Join Date: Sep 2015 Location: Peabody, MA iTrader: (1)	Excessive oil blow by + boost leak, could be PCV? So I've got a decent amount of blow by on my N55 -- I'd say an almost abnormal amount. I have contemplated getting a catch can but I also am working to chase down a boost leak. I am curious if a failed PCV could cause both and what my options are to replace it. Thanks, Nate
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11-06-2015, 10:03 PM	#2
AX75F92 Private 6 Rep 97 Posts Drives: 335 Join Date: Jul 2015 Location: oc iTrader: (0)	I just replaced my charge pipe and noticed the inside was coated with oil. Seemed excessive to me, I've read N55 doesn't suffer from blow by issues like the N54. Not sure how much is "normal"... What lead you to say yours is abnormal?
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11-08-2015, 09:50 AM	#4
nate16 Banned 172 Rep 327 Posts Drives: 2017 F80 YMB ZCP Join Date: Sep 2015 Location: Peabody, MA iTrader: (1)	Definitely let me know. I'm ripping out the entire intake system, fmic, hot and cold side piping and checking vac lines today trying to find this boost leak. Did a boost leak test yesterday and found a little leak at the TMAP sensor but I've fixed that now and still same problem.
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11-08-2015, 05:21 PM	#7
nate16 Banned 172 Rep 327 Posts Drives: 2017 F80 YMB ZCP Join Date: Sep 2015 Location: Peabody, MA iTrader: (1)	Forgot to take pics lol but found my boost leak. It is the joint where the turbo connects to the fmic piping. There's a little gasket in there that's not properly sealing. BMW doesn't even list the part number for it but I think I found the exact same one but off an F30. Going to try that part first then buy the whole pipe if I can't get the gasket by itself.
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11-09-2015, 07:13 PM	#8
sy2767 Major 148 Rep 1,133 Posts Drives: 2013 x5 Join Date: May 2010 Location: manitoba iTrader: (1)	And the oil issue?
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11-08-2015, 09:53 AM	#6
nate16 Banned 172 Rep 327 Posts Drives: 2017 F80 YMB ZCP Join Date: Sep 2015 Location: Peabody, MA iTrader: (1)	I'll take some pics when I pull the whole charge air system out today.
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11-09-2015, 11:16 PM	#9
nate16 Banned 172 Rep 327 Posts Drives: 2017 F80 YMB ZCP Join Date: Sep 2015 Location: Peabody, MA iTrader: (1)	Oil issue is unresolved still... Pulled the fmic piping again today, not worse or better, starting to think it's normal and will just grab a catch can
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11-10-2015, 03:55 PM	#10
torr Enlisted Member 11 Rep 49 Posts Drives: 2011 335I e92 Join Date: Apr 2013 Location: United States iTrader: (0)	Excessive oil blow by I managed to get my engine completely disassembled and believe my excessive blow-by oil/consumption is the result of a bent #6 rod. Valves, cylinders, rings and pistons are all looking good. __________________ 2011 BMW 335i auto JB4 Stage 2, FF/wires, BMS Intake, Pure Stg2, Pure intake, +DV, Helix FMIC, AR DP, ER CP, Alpina Trans Flash.
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