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Hey all. Was changing out the headlight bulbs and a horn (not working) and while I had the front bumper off I thought I'd take a look at this petcock issue. Yes, can definitely see it from above and below, but getting your hand in there is another story. I played with it abit and stumbled across a solution - a 13/16 or 21mm spark plug socket.
Attachment 17132
Attachment 17133
You can see that the socket fits over the ears of the petcock nicely - tightly enought that it provides the appropriate leverage on the ears, and loose enough that it allows you to have the extention/ratchet at an angle if necessary to get it in place and turning.
Attachment 17134
Admittedly you can't do the "pull out while you turn" maneuver that's recommended, but if you're careful (and lucky?) you'll be alright. I used some plastic-safe electrical lubricant (CRC brand) on the petcock, letting it soak for a while before trying my luck at getting it to turn. By the time I tried the spark plug socket/extension setup it had probably been soaking for 20 minutes or so. Can't say if it helped, but in the end I was able to crack the petcock open and drain a smalll test amount in a bowl. Perhaps I was both careful and lucky, eh? Well, I reckon I'm now capable of getting a drain and flush done!
Hope this helps.