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Date: Tue, 11 Jan 2011 13:07:28 -0500
From: Ernest Christley <echristley@att.net>
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Subject: Re: [FlyRotary] Re: Broken Tension Bolt ... update
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Jeff Whaley wrote:
> So far no luck at getting the broken tension bolt threaded end out of=20
> the front casting.  With help from Cary Beazley, we were able to back=20
> out the broken part a little bit with just pressure and mating the two =

> surfaces together, until it jammed and would come no further.  Not=20
> having (or knowing about) LH drill bits at the time, we decided to RH=20
> drill a pilot hole for an easy-out.  Drilling the hole was no problem=20
> but getting it centered was, so it=92s drilled off-center and the broke=
n=20
> piece is now probably bottomed out in the casting.  The easy-out is=20
> simply not latching onto the bolt.  We=92re going to borrow a bore scop=
e=20
> to get a better look.  After that I=92ll have to make a long center-pun=
ch=20
> and try to make a new (centered) pilot hole with the long LH drill bits=
=20
> on-order (see link) =85 hopefully they=92ll grab onto the part and extr=
act=20
> it, otherwise it will be an engine tear-down, which I dread at any time=
=20
> but at -10C it=92s no fun at all.
>=20

Jeff, send me a couple of measurements and I'll turn a collar that you ca=
n use as a guide to center the drill bit.  The=20
inside diameter would be the diameter of your bit.  The outside would be =
the size of the hole.