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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 Tue, Dec-04-2018, 07:34:11 PM   #31
Drewster
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Default Re: Warped Valve Cover?

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Originally Posted by hunter6 View Post
To add to the conversation...I have had the VCG leak on three occasions. Once a year after a very reputable shop did the 30k mile valve adjustment (they re-did the gasket free), another at about 50k miles and the VCG was replaced in Germany by a BMW dealership service shop. The third leak has occurred at 66k...about a year after the 60k valve adjustment. Reputable mechanic just diagnosed a warped VC. I believe it to be true. I canít account for 3 VCG leaks with any other explanation.

Thoughts?
"BMW Service Shop" is that a BMW dealership using BMW parts? Or a shop in Germany that works on BMW's?

The answer is the same - it's highly unlikely that your valve cover is warped, but a *high* likelihood that the gasket is aftermarket and is destined to leak.

If an OE gasket was properly installed and leaks after 10k, I would ask to see the evidence, but *maybe* you're the first to actually have a valve cover issue... but I hate to see your cylinder head if that's the case.

As a side note, a leaking CPV is also commonly mis-diagnosed as a valve cover gasket.
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Old Sat, Apr-20-2019, 07:16:19 AM   #32
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Default Re: Warped Valve Cover?

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Originally Posted by Drewster View Post
"BMW Service Shop" is that a BMW dealership using BMW parts? Or a shop in Germany that works on BMW's?

The answer is the same - it's highly unlikely that your valve cover is warped, but a *high* likelihood that the gasket is aftermarket and is destined to leak.

If an OE gasket was properly installed and leaks after 10k, I would ask to see the evidence, but *maybe* you're the first to actually have a valve cover issue... but I hate to see your cylinder head if that's the case.

As a side note, a leaking CPV is also commonly mis-diagnosed as a valve cover gasket.
Sorry to revive this thread as I am having the same troubles as OP in terms of leaking valve cover.

You mentioned and others over the web mentioned that CPV can be misdiagnosed as valve cover gasket leak. will a leak from CPV cause smoking from rear/passenger side corner area of the engine? That's what I am getting as well the same as OP from what I can tell.
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Old Sat, Apr-20-2019, 10:42:52 AM   #33
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Default Re: Warped Valve Cover?

I had the same problem, new valve cover fixed it. No problems since, 60k on new cover.
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Old Sat, Apr-20-2019, 03:34:29 PM   #34
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Default Re: Warped Valve Cover?

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Originally Posted by hemi8 View Post
I had the same problem, new valve cover fixed it. No problems since, 60k on new cover.
you changed the cover itself? where'd you get a brand new one? or did you just get a good used one?
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Old Sun, Apr-21-2019, 10:54:20 AM   #35
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Default Re: Warped Valve Cover?

Wow, didn't realize I posted this so long ago.

I can say my OEM BMW VCG is still perfect, no leaks.

Shop made it all good, in fact, reimbursed me for new VCG. I think since I posted this, it's been noted that the other branded VCG packaging is potentially contributing to the leaking; I also think the material difference at fault.

If people are really have warped VCs, I'd like to see some profile measurements that prove it for my own learning.
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Old Sun, Apr-21-2019, 05:01:52 PM   #36
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Default Re: Warped Valve Cover?

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Originally Posted by PSUEng View Post
Wow, didn't realize I posted this so long ago.

I can say my OEM BMW VCG is still perfect, no leaks.

Shop made it all good, in fact, reimbursed me for new VCG. I think since I posted this, it's been noted that the other branded VCG packaging is potentially contributing to the leaking; I also think the material difference at fault.

If people are really have warped VCs, I'd like to see some profile measurements that prove it for my own learning.


I mentioned this to racewerkz and they said they checked the cover on a straight edge and they didn't see any gaps. Not sure if they really did or not but that is my last resort.

So you changed your actual cover as well and problem was fixed I assume?
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Old Sun, Apr-21-2019, 11:07:50 PM   #37
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Default Re: Warped Valve Cover?

No I only changed out the victor reinz VCG that my shop installed. Sealed the half moons and vanos to head surfaces and no problem.
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Old Mon, Apr-22-2019, 06:10:15 AM   #38
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Default Re: Warped Valve Cover?

The only reason for warped VC is someone installed the cover and accidentally jammed one of the cable under, then torqued the bolts tight and bent it. Best way to check a warped cover is to place it on a thick glass — coffee table or dining table. Granite block is best.
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Old Mon, Apr-22-2019, 08:00:27 AM   #39
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Default Re: Warped Valve Cover?

its not the VC that warped, its the head , need a new engine im afraid
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Old Sat, Apr-27-2019, 05:07:35 AM   #40
erickrayos
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Default Re: Warped Valve Cover?

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its not the VC that warped, its the head , need a new engine im afraid
that would be a highly unlikely scenario. since the engine was rebuilt currently has about 1.4k miles. and the head was checked for flatness and didnt even much done on it just a couple of high spots was touched and it was completely flat. had valve seals replaced and thats about it.

everthing on it was good to go. and the engine hasn't come close to overheating so no chance of it warping as well.
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Discussing Warped Valve Cover? 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)