So...the free M52 I just picked up is coated with this brittle gunk. No wonder the camshaft broke. Any idea what it is? The motor's getting torn down, so I'm not to worried about it, just curious.
Underside of valve cover:

Cam support bearing where camshaft broke: :shock::shock:

This is the top of the camshaft cover. I scrapped a little of the stuff off with a screwdriver tip. It comes of very easy and is brown.

Underside of valve cover:

Cam support bearing where camshaft broke: :shock::shock:

This is the top of the camshaft cover. I scrapped a little of the stuff off with a screwdriver tip. It comes of very easy and is brown.



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