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Re: damaged thread!
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Posted by Carl [Email] (more from Carl) on Sat, 29 Mar 2003 11:12:31 Share Post by Email
In Reply to: damaged thread!, saaber, Sat, 29 Mar 2003 10:35:02
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If the threads are not that badly damaged your best bet would be to go buy a tap and chase the existing threads. If the hole is blind, meaning that it ends in solid material and does not extend until it hits another opening in the block, just run a tap down with some tapping fluid or thin oil. Run the tap in making sure you stay in-line with the existing thread until you feel resistance. At this point go slowly and occasinally back the tap up to clear the cutters. Every once in a while back the tap out completely and use compressed air to blow out the hole and clear the flutes on the tap. Since you are only cleaning up preexisting threads in aluminum it should go very easy. If the threads go close to the bottom of the hole you may also need what is called a "bottoming tap". This is a type of tap with a blunt nose and a very small lead-in that allows you to thread very close to the bottom of a blind hole. If you don't konw where to get taps, they are available in singles next day from McMaster-Carr.
If the hole extends into the internal thermostat cavity, just run a tap down it with some cutting fluid, but be careful to catch the chips so they don't end up in your coolant. Stuff a couple of paper towels down under the hole to catch the chips.
Make sure the bolt threads are not what caused the damage to the threads in the first place. If they are, replace the bolt or run a die up the bolt to clean its threads. Upon reassembly use antiseize.

posted by 68.14.134...

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