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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Oct-26-2018, 04:27:13 PM   #1
hansonchris
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Default CPV valve leak, not the o-ring?

So this cpv valve is beginning to get the best of me.... Ive changed the o-ring twice on this sucker. Can the actual valve be the culprit as well? Heading to the dealership in the morning to pick up a new one because the current installed one is on the edge of getting stripped from me going back and forth with it.

IS there anything else I could be doing wrong with this??
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Old Fri, Oct-26-2018, 05:15:30 PM   #2
Drewster
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Default Re: CPV valve leak, not the o-ring?

Stop getting OE replacements! They just have standard O-rings that will fail.

Get one of the replacement Viton ones for your existing valve
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Old Fri, Oct-26-2018, 05:54:55 PM   #3
hansonchris
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Default Re: CPV valve leak, not the o-ring?

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Originally Posted by Drewster View Post
Stop getting OE replacements! They just have standard O-rings that will fail.

Get one of the replacement Viton ones for your existing valve
Guess I should have been more clear...

I am using the Viton orings(Bought 10 at a discount)... Did the first oring swap 4 days ago. Saw again that I was leaving a few drops of oil in the garage. Did another swap and again... few drops. All very much so seem to be coming from the cpv.
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Old Fri, Oct-26-2018, 06:08:23 PM   #4
Joshe46
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Default Re: CPV valve leak, not the o-ring?

Are you sure its not rear main seal? Or even vcg for that matter? Clean that area with degreaser or brakleen. Then check again after some drives.
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Old Fri, Oct-26-2018, 06:13:28 PM   #5
umichchris
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Default Re: CPV valve leak, not the o-ring?

damn, im sorry to hear that. im in the midst of a header swap and decided to change out my CPV while in there....this thread reminds me to order up a new gasket from Viton as well....might as well.

i think i got the OEM CPV from ECS Tuning for like $48....might as well replace it all just to be safe/process of elimination
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Old Fri, Oct-26-2018, 06:40:43 PM   #6
hansonchris
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Default Re: CPV valve leak, not the o-ring?

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Originally Posted by Joshe46 View Post
Are you sure its not rear main seal? Or even vcg for that matter? Clean that area with degreaser or brakleen. Then check again after some drives.
Yeah Im sure its not the rear main and vcg, I after the second replacement I did a full cleaning. Went for a 8 min drive and came back to the garage to check out the area and saw some oil splashes around the cpv. The bell housing was clean as day.

At this point Ill just put a new valve in with the updated oring on and go from there. Such a pia...
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Old Fri, Oct-26-2018, 08:11:56 PM   #7
Drewster
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Default Re: CPV valve leak, not the o-ring?

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Originally Posted by hansonchris View Post
Yeah Im sure its not the rear main and vcg, I after the second replacement I did a full cleaning. Went for a 8 min drive and came back to the garage to check out the area and saw some oil splashes around the cpv. The bell housing was clean as day.

At this point Ill just put a new valve in with the updated oring on and go from there. Such a pia...
Where did you get the O-ring? Is there a spec you used?

FWIW, I changed mine and it hasn't leaked since
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Old Fri, Oct-26-2018, 08:20:38 PM   #8
hansonchris
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Default Re: CPV valve leak, not the o-ring?

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Originally Posted by Drewster View Post
Where did you get the O-ring? Is there a spec you used?

FWIW, I changed mine and it hasn't leaked since

I got them from ecstuning. They are to spec. I going to clean up the area where the actual valve goes. Maybe something is there where the seal is which is allowing the pass through of oil. IDk... Im pissing in the wind at this point.
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Old Fri, Oct-26-2018, 10:43:33 PM   #9
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Default Re: CPV valve leak, not the o-ring?

Quote:
Originally Posted by hansonchris View Post
I got them from ecstuning. They are to spec. I going to clean up the area where the actual valve goes. Maybe something is there where the seal is which is allowing the pass through of oil. IDk... Im pissing in the wind at this point.
Ah, yeah, that's where I got mine. Definitely deburr the area, ensure there are no gashes on the sealing surfaces. And ensure the seal is lubricated
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Old Fri, Oct-26-2018, 11:14:00 PM   #10
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Default Re: CPV valve leak, not the o-ring?

The valve itself can not leak oil to the outside of the engine unless the seal or the threads are not clean. And the valves themselves don't normally fail.

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Discussing SMG troubleshooting FAQ in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)