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Posted by chriscase on Friday, August 29, 2008 at 23:41:16 :
In Reply to: Thread repair.. Carburator. posted by The Dodge Boys on Friday, August 29, 2008 at 21:52:26 :
Dig through all you old brass fittings to find anydamn thing that is 1/4 pipe male on one end and has a hole straight through.
Clamp the carb body in a drill press vise. Get it very vertical. Un plug the drill press, you won't want it to start accidentally. Put a 1/4 pipe tap in the drill press chuck*. Turn the chuck, by hand, by using the key as a handle. Basically, you are using your d.p. as a 'tap machine' to keep thing lined up. Only tap it in far enough for the fitting to go nearly through. Install the fitting with loctite. Note that we have not yet removed the carb from the vise. You want to preserve it's verticalalityness. Now plug in the drill press, and drill for the proper tap size for the 7/16 thread of the seat. Drill all the way through the full length fitting. Unplug the drill press, and once again use it as a tap machine to thread for the seat threads. Brass is funny to work, the tap my need more twist than the chuck will grip, after the first few turns. But once the tap is well started, you can remove the chuck and turn the tap by the usual wrench. Either way, remove the body from the d.p. vise. Saw off the excess brass fitting, and sand it flush and square by using a bench mount disc sander.
Wah-La, a solid brass, leak proof bushing that is invisible once the seat is installed. And required no special tools- them darn helicoil tools and inserts really bite you in the wallet. And can come loose, and can leak.
* My pipe tap was too big for my chuck, So I used a counter sink in the chuck as a center, and turned the tap by open end wrench. YPTMV- (Your Pipe Tap May Vary)