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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 05-26-2014, 08:51 PM   #1
E46Cruisin
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Oil is leaking like my patience is running thin. Help!

Hey guys,

Since I got my bimmer about three years or so ago, there's been a multitude of problems, many of which have been sorted out and forgiven. It still has some, but the most annoying of which is this oil leak. It shows all the symptoms of a VCG, but I've replaced that and I'm still having the same symptoms. I recently removed the VCG to have another look, and everything looks to be in good condition, but there are still signs of a leak coming from the same area under the VCG. I suspect a bad CCV, but I have a few questions.

I'm not seeing any of the signs of oil consumption that I see people reporting on these forums as a symptom of a bad CCV, but the only thing I can think to be causing the persistent leak from under the VCG would be increased pressure under the valve cover from a bad CCV.

Another concern of mine is that after doing a wipe down underneath the car to try to see which side of the engine the leak is coming from, it looks like there's oil dripping from the VCG-side leak, and from the other side. Would a bad CCV be leaking oil at all on that side of the block?

Thanks guys and gals
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Old 05-26-2014, 09:35 PM   #2
Sansho
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Couple of questions ... did you use RTV on the head when you installed the new VCG? It would look like this on the front, and the same on the back:



When you've had the valve cover off, have you checked it for any warpage?

What brand VCG did you install?
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Old 05-26-2014, 09:40 PM   #3
E46Cruisin
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Used OEM VCG, and yeah I used RTV on those locations. Problem location is back left of the valve cover, on the side, no leaks to be seen from the areas shown in your picture.
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Old 05-27-2014, 09:09 AM   #4
markusmarkus
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Inspect the valve cover to see if there's a hairline crack. Also, did you install new rubber "disks" - one for each bolt holding the VC on? Could be a warped VC. Next time it's off see if the VC check the VC for an uneven mating surface.


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Old 05-27-2014, 11:43 AM   #5
E46Cruisin
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markus, yes the VCG I bought came with new grommets for every bolt holding the VC on. How would I go about checking for a warped VC or uneven mating surface?
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Old 05-27-2014, 01:24 PM   #6
samuelan
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Quote:
Originally Posted by markusmarkus View Post
Inspect the valve cover to see if there's a hairline crack. Also, did you install new rubber "disks" - one for each bolt holding the VC on? Could be a warped VC. Next time it's off see if the VC check the VC for an uneven mating surface.


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Sorry to jump in on this thread but am having the same issue as yours OP. Replaced my VCG a week ago and oil is leaking from the back left portion, causing it to smoke on the exhaust manifold.

While replacing the VCG I noticed that the cover was cracked at the top left bolt point. However, I used RTV sealant and hope that did the deed.

What are your guys thoughts on this? Could I use JB Weld and call it a day? Or would I need to replace the cover?
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Old 05-27-2014, 02:04 PM   #7
Sansho
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Someone else here recently tried JB Weld on the valve cover, and it didn't work. Replace the cover.
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Old 05-28-2014, 12:07 AM   #8
E46Cruisin
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Okay so check the VC for cracks and warping, what else? Any thoughts on the CCV? Could that be causing a visible oil leak on the CCV side of the block?
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Old 06-02-2014, 01:28 PM   #9
marvinstockman
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First, BMW's engine's leak, Mercedes' engines leak, and being 67, I leak

Second, how much oil is getting to the ground?

Third, no third for now.
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Old 06-02-2014, 01:58 PM   #10
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Originally Posted by marvinstockman View Post
First, BMW's engine's leak, Mercedes' engines leak, and being 67, I leak

Second, how much oil is getting to the ground?

Third, no third for now.
Can't speak to the Mercedes engines or you, but I can't agree on the blanket statement of BMW engines leaking... Mine has only leaked when the VCG needed to be replaced once, and once again when the oil pan gasket needed to be replaced. Otherwise the engine has always stayed externally clean and leaves no traces in any parking spots. This is over a 223,000 mile life so far...
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Old 06-02-2014, 02:23 PM   #11
erickonphoenix
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I've noticed if these cars are used daily they tend not to develop oil leaks.

BTW, if you habitually romp on it before the engine is up to temperature it seems to reduce the life of the CCV. ESPECIALLY in cold environments.
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