Quote:
Originally Posted by vernon
I'd install a hilli coil insert
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Not hard. This one almost the perfect Heli-coil repair.
They give you the drill and tap, and (commonly) an "insertion" tool. You drill centered on the existing threads with the drill, then tap the hole with the tap. Then - using the tool (I've done it with needle nose pliers) you screw the insert into the tapped hole you created. Using needle nose I end a bit short and grind off the heli-coil "spring" (what it is really.) Using their tool you turn it in until the tang breaks off - sort of mindless.
Since I was ending short I used Loctite. Full depth you don't need to.
Heli-coil actually makes the threads "stronger" than the original. Cast iron racing motors are commonly "heli-coil'ed" on head studs of high compression/high performance engines for this reason. And - just so you'll feel some measure of assurance - Heli-coil system is APPROVED for nuclear application.
Some might think this a downside - but Nuclear is but another demanding client who normally can afford the best - and is willing to pay for it.
Some like the larger diameter "plugs" - these work too and for the same reasons.
Joe K