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Old 12-02-2019, 11:19 PM   #1
wfx32
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ccv return line insulation crumbling



should i be more worried about the crumbling insulation on the ccv return line? i have found pieces of it everywhere.
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Old 12-03-2019, 12:45 AM   #2
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not really. That stuff will crumble way before the line itself becomes compromised. You should be more worried about the lower line off of the oil separator. It's usually the first one to go.
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Old 12-03-2019, 06:51 AM   #3
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should i be more worried about the crumbling insulation on the ccv return line? i have found pieces of it everywhere.
If it's not actually leaking I wouldn't worry about it as far as that is concerned but if it's old enough for that stuff to crumble perhaps it's due for a change.
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Old 12-03-2019, 07:24 AM   #4
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thanks, independent mechanic here replaced the ccv and other lines, but he left that crumbling top line. can’t say i blame him, because when i cleaned and replaced the icv, the ccv and one of the rear port caps fell apart creating massive vacuum leaks.

so now i am not so gung ho about the diy repairs on this old car. but i am working up the nerve to replace the coolant lines under the intake manifold as part of a full cooling system refresh. and replacing the ccv and plastic valve cover with the m56 aluminum cover.
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Old 12-03-2019, 07:41 AM   #5
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I would just remove the insulation. Better off without it IMO.
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Old 12-03-2019, 08:12 AM   #6
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That’s not a return line. It’s a vacuum line.
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Old 12-03-2019, 08:42 AM   #7
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That's not a return line. It's a vacuum line.
i mean this one: realoem #7 or 11617504536 "return pipe"

*edit: isn't this where the air returns to the intake? with less or more oil depending on whether the ccv is working?

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Old 12-03-2019, 08:49 AM   #8
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If it's not actually leaking I wouldn't worry about it as far as that is concerned but if it's old enough for that stuff to crumble perhaps it's due for a change.

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Old 12-03-2019, 09:30 AM   #9
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+2 As long as the hose itself isn't cracked underneath the crumbled insulation, you'll be fine. That one isn't too bad to replace if you go that route, and it's cheap anyway.
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Old 12-03-2019, 10:09 AM   #10
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@wfx- leave it alone until your next valve change , of the CVV lines that I have .the valve will crap out before that line breaks.Don't mind the insulation,just clean debris off that area when you take the manifold off.
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Old 12-03-2019, 12:16 PM   #11
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Good lord. Your mechanic isn't touching things because they are too brittle?!

Replace the line. It takes all of five minutes. And replace the caps.
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Old 12-03-2019, 02:35 PM   #12
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Insulation on CCV lines can cause more problems than it solves.
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Old 12-03-2019, 02:56 PM   #13
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Insulation on CCV lines can cause more problems than it solves.

i know i was thinking the same thing. as if the cold weather kit wasn’t already a bad idea.
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Old 12-03-2019, 02:58 PM   #14
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One of the ways to make the CCV last longer is to aggressively clean the drainage channels at the bottom of the dipstick. Sadly, you can't just soak it in a solvent, but folks have had success with piano wire. When they back up, the CCV clogs and goes cattywumpus.
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Old 12-03-2019, 03:17 PM   #15
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One of the ways to make the CCV last longer is to aggressively clean the drainage channels at the bottom of the dipstick. Sadly, you can't just soak it in a solvent, but folks have had success with piano wire. When they back up, the CCV clogs and goes cattywumpus.

good advice there, because most people will want to make the bmw solution work as designed. and extra points for the use of “cattywumpus”.
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Old 12-03-2019, 03:18 PM   #16
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good advice there, because most people will want to make the bmw solution work as designed. and extra points for the use of “cattywumpus”.
My favorite kind of "wumpus"
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Old 12-03-2019, 03:20 PM   #17
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A slightly more aggressive solution:
https://www.fcpeuro.com/products/bmw...z4-11437565437

The redesigned dipstick has a different flow channel. I live in SF, so I don't need, but I have read that it has better drainage to lessen odds of backup.

Read more here:
https://www.bimmerfest.com/forums/sh...d.php?t=670651

Last edited by Archbid; 12-03-2019 at 03:25 PM.
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Old 12-03-2019, 03:31 PM   #18
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A slightly more aggressive solution:
https://www.fcpeuro.com/products/bmw...z4-11437565437

wow i didn’t know they came up with a cold climate dipstick tube as well. it’s like the bmw engineers were willing to redesign the whole car rather than give up on their low friction piston rings.
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Old 12-03-2019, 03:35 PM   #19
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One of the ways to make the CCV last longer is to aggressively clean the drainage channels at the bottom of the dipstick.
My drain channel is capped off, one of the advantages of the M56 valve cover mod.
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Old 12-03-2019, 05:22 PM   #20
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Originally Posted by Archbid View Post
A slightly more aggressive solution:
https://www.fcpeuro.com/products/bmw...z4-11437565437

The redesigned dipstick has a different flow channel. I live in SF, so I don't need, but I have read that it has better drainage to lessen odds of backup.

Read more here:
https://www.bimmerfest.com/forums/sh...d.php?t=670651
Oy vey! $145 for a dipstick tube?
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