Thread repair options


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Posted by David Sherman on Tuesday, May 05, 2009 at 00:54:48 :

I stripped a hole in the water pump where the bypass elbow attaches to the top of it. It'd be nice to fix it in place without having to pull off the pump again. I know helicoil is the tried and true method, but I'd have to buy the $pecial tap, and I know there are other ways to do it. Plus I sort of have a bias helicoils because of a gold-plated helicoil tie-tack my father was given when he worked on Minuteman. I'm thinking the options, without removing the pump, are helicoil, solid thread insert (maybe uses standard taps?), just drill and tap it the next size bigger and forget about keeping it "authentic", or clean it out good and fill it with metal-filled epoxy, then drill and tap. If I have to remove the pump, I could braze up the hole, then drill and tap it, but it seems like I shouldn't have to do that. It's a 5/16-18 hole. I checked to see if (hopefully)it was the bolt, not the hole, that was stripped, but no such luck. The ironic thing is I stripped it trying to stop a small leak that turned out to have been caused by a loose hose clamp. If I'd checked the hose clamps before tightening the bolts, I wouldn't have stripped it out. Naturally, this happened after I drained out the plain water I'd been using for my test runs and put new anti-freeze in.



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