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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 11-11-2013, 12:18 PM
Rahulk Rahulk is offline
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Mein Auto: E53 N62; E90 N52
Valve cover N52/ N52N

Hello all!

So I was thinking, is it possible to change out the magnesium valve cover for the plastic valve cover?

The biggest benefit would be the use of the steel valve cover bolts vs the aluminum bolts. Also the Valve cover gasket for the plastic vc is a nice thick rubber while the vc gasket for the magnesium is a 'crush' type seal that I don't think holds up to well.

The other big benefit is that the oil separator system is built into the plastic vc, versus the magnesium cover which has a oil separator that under the intake manifold.....


I doubt Ill change the valve cover, but it does sound like it would be a benefit if you can find a used one some place or the other.
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  #2  
Old 11-11-2013, 01:31 PM
fdriller9 fdriller9 is offline
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I'm pretty sure you need to use the aluminum bolts because they don't react with the magnesium block. Steel does...
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  #3  
Old 11-11-2013, 02:12 PM
Rahulk Rahulk is offline
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Mein Auto: E53 N62; E90 N52
block

The Block is a Magnesium/Aluminum/Calcium block, but the head is aluminum alloy.

The bolts for the plastic vc are in fact steel/ cadmium plated and can be reused. Which I was surprised about.

I will have to check to see if the head is the same part number for both the n52 and n52n.

If so I would say the upgrade is well worth it, especially if you are one of the first few who can sell your magnesium covers...... I'm pretty sure it is a magnesium alloy, since magnesium ignites at STP and is nearly impossible to put out.
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Old 11-11-2013, 03:36 PM
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Saintor Saintor is offline
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Mein Auto: BMW E90 2007
Quote:
Originally Posted by Rahulk View Post
Hello all!

So I was thinking, is it possible to change out the magnesium valve cover for the plastic valve cover?

The biggest benefit would be the use of the steel valve cover bolts vs the aluminum bolts. Also the Valve cover gasket for the plastic vc is a nice thick rubber while the vc gasket for the magnesium is a 'crush' type seal that I don't think holds up to well.

The other big benefit is that the oil separator system is built into the plastic vc, versus the magnesium cover which has a oil separator that under the intake manifold.....


I doubt Ill change the valve cover, but it does sound like it would be a benefit if you can find a used one some place or the other.
Do you mean that the 1st batch of N52 had not a plastic valve cover? News to me.

I had to pay 1000$ to change it (at 2nd gasket change). Wished that it was in metal.
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  #5  
Old 11-11-2013, 04:18 PM
Rahulk Rahulk is offline
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Mein Auto: E53 N62; E90 N52
Valve cover N52/ N52N

Plastic vc's have steel bolts and rubber gaskets... Metal vc's (magnesium) have metal gaskets and aluminum 1 time use
Bolts that are known to break flush with the head...

Plastic vc's are way better... Worked on N62's which are considered a pia... And once you get the hang of it.. You can knock it out in no time...


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  #6  
Old 11-12-2013, 09:30 AM
fdriller9 fdriller9 is offline
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I'm saying that using steel bolts on the magnesium/aluminum block will have galvanic corrosion. So I guess you can use the plastic cover and pick up a set of aluminum bolts instead of steel.

I wouldn't swap the cover anyway. I'm not sure if the plastic cover has the check valve to maintain oil pressure when the engine is off to prevent the valve lifters from ticking.
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Old 11-23-2013, 08:25 PM
Melrose Melrose is offline
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See my post, I am on the third plastic one in six years, allcovered by original and private warranty company, but three in 37k is ridiculous. Why isn't there a class acrtion lawsuit on this ?? I am not going to take this lying down. BMW can't make anything of plastic or rubber that doesn't fail. For a luxury car this is ridiculous.
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