On Thu, 21 Jun 2012 23:02:40 -0500 OK Don <[email protected]> wrote: > We're also talking about the larger piece of metal that the hole is in. > When it expands, the hole actually becomes smaller (?).
No, when the metal expands, the hole gets larger. Think of what happens to a circle drawn on a solid piece of metal. Then think of what happens to an infintesimally thin layer of metal around the circumference of the hole. When it expands, it gets longer. When it gets longer, the circumference gets larger. When the circumference gets larger, the diameter gets larger. > The further stripping of the hex socket in the bolt head is why I > "hollow grind" the larger Allen bit before hammering it into place. It > cuts a star shaped socket that matches the bit. I tried that, but it's hard with a 5 mm allen key. > I have not had this method fail, but I can't remember for sure that I > have tried it on a steel bolt stuck in an aluminum casting. I did have > to use it to remove the A/C compressor bracket from an iron M117 block. Having steel threaded into aluminum does make it harder. This evening, I tried heating the bolt with an oxy-acetylene torch and then chilling it with ice water, but that didn't seem to help. Tomorrow, I will look into removing the bearing bracket of the viscous fan clutch (Section 20-3140). That's the part into which the offending bolt is threaded. Craig _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://mail.okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
