Thread: Valve cover leak...
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Old Sep 22, 2010 | 11:38 AM
  #33 (permalink)  
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onehundred80
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Default Re: Valve cover leak...
Originally Posted by bspence
The covers are magnesium, the heads aluminum alloy. MB engineers, very smart folks chose to use aluminum fasteners to avoid dissimilar metal corrosion problems no doubt.
The covers are surely not magnesium, but an aluminum/magnesium alloy as is the block. Magnesium used in it's pure form is too dangerous as it burns intently and is hard to extinguish.
Magnesium, with other materials, is used as an alloying element in the aluminum to improve the final materials properties.
Magnesium is a costly material and is too costly to be used in this part where there is no benefit.
 
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