Thread: 525i Head
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Old 01-31-2011, 01:45 PM
ricks5series ricks5series is offline
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Location: So. Ca
Join Date: Dec 2008
Posts: 517
Mein Auto: 525i, Corvette, 530i
Originally Posted by robertobaggio20 View Post
What do you mean by magnafluxing the head?

And pressure testing is something done with the head off, the head is sent to a machine shop with a pressure tester that feeds in warm water at high pressure at one end of the water jacket. The other end of the water jacket is stoppered up. Then they watch to see if water escapes from anywhere.
He's referring to magnetizing the head then spraying a metallic powder which will determine cracks under an ultraviolet light. Perhaps you're wondering if aluminum can be magnetized. I'm not sure myself by whatever I do, I'll certainly have the machine shop check for cracks, both internal & external.
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