Re: pet cock problem! Know how to get the threads out?

Posted by Alberta Mike on June 17, 2001 at 15:17:09 from (209.47.89.116):

In Reply to: pet cock problem! Know how to get the threads out? posted by Tim on June 17, 2001 at 14:12:29:

Yup, that old brass (assuming the petcock is brass) gets pretty rotton over time and they twist off easily. Hard to tell for sure from your post exactly where you're sitting right now with that problem (unless I didn't read it carefully enough). Sounds like you've got something (screw extractor or part of one) inside one of the water jackets in the block, is that correct? Generally, it'll most likely just sit in there and won't be carried by the coolant flow so it shouldn't be too much of a problem. I imagine if it got into your water pump it might be a bit scarey but I'd say that's doubtful. If part of the petcock casting is still in the block, try drilling it out going from small to bigger drill bits. Stop at the one which is the recommended size for the petcock, probably 1/8" pipe thread on that fitting. That would be a "Q" size tap drill and the SAE size closest to that (smaller) would be 21/64 inch. Once you're there, you could probably pick out the remnants of the petcock threads with one of those little dental-type hooks that they dig around in your teeth with.

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