Quote:
Originally Posted by Mvy
I think its a coating inside that flakes off the magnesium valve cover. I think they put the coating on to protect it but the heat cycles makes it fall off. I am not sure if blasting and re coating it is the best idea, or if just blasting it clean and adding a new gasket would work. I am just leaning towards replacing as the time it will take to clean it up then recoat is going to cost me close to just replacing.
|
I meant the exterior leak in the picture. BMW has been using magnesium valve covers on some cars since at least the early 90s — M50 and M60 motors—
and the paint or coating on the inside does flake off. The flaking has not killed those motors but maybe the earlier motors were more durable.
Not sure what a flake does when it drops? Disintegrate? Get trapped in the pick up or filter? Score a cam or crank journal?