Subject: Re: Broken generator bolts
Author: Bruce Giller
Date: Jun 6, 2001, 4:55 AM
Post ID: 1707007520
Recently I tried to remove all the exhaust studs (8) from an Alfa 2
liter head (don't ask me why, I have no explanation). Only two came out
willingly using the double-nut method; 2 sheared off with double-nut
method; 4 sheared off using a Craftsman stud-remover tool (worthless
junk in my opinion).
I bought a set of Craftsmans Power bolt Extractors exactly like the
ones in the Penn. Tool catalog. Didn't work any better than Ez-Outs
except that they didn't break inside the drilled out hole. Drilled two
of them to use my new toy and when it didn't work out, tried to drill
the stud out and made a slight mess (bad angle). Whipped out my Mig
welder, bought a bunch of nuts and welded the nuts to the remaining
portions of the other studs. Using heat and a hand impact-driver, I
managed to get out 3 more out. 3 of them sheared off flush with the head.
The head went off to the machine shop for lots of work and included in
the bill was a line item for stud extraction and a few heli-coils.
My conclusion on stud removal: don't! But if you have to, heat up the
metal surrounding the stud as much as you can before applying any
rotational force. In fact several cycles of heat 'n cold helps. My
next toy is going to be one of those stud extractors that look like
sockets which fit over the stud and by a cam action grip the stud as you
turn the socket.
And left handed drill bits can be found at most decent hardware stores.
Bruce
'72 Eldo
| Hi All, Has anyone used "Drill-Out Broken Bolt Extactors"? Seehttp://penntoolco.com/catalog/products/1966.cfm Look like they would work well. Kinda like a reverse drill bit with easy-out in one. Of course in any case, to drill them out the engine will have to be tilted one way or the other, or you'll have to use an angle drill (or angle attachment) to have enough clearance to get a straight shot into them. Right? |