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Initially, I considered JB weld until I looked at the thermometer – I don’t have much faith in JB weld at -10C. Also, at this point if the piece is now bottomed
then there’s a high risk the JB will weld to the casting and not the broken bolt end. I’m waiting for the AC-12L bits … if that doesn’t work then a tear-down will do.
Jeff
From: bktrub@aol.com [mailto:bktrub@aol.com]
Sent: Wednesday, January 12, 2011 12:59 AM
Subject: Re: [FlyRotary] Re: Broken Tension Bolt ... update
Before you take it apart, you might want to try one more time with some JB weld and the remainder of the bolt. Can't hurt to try again.
-----Original Message-----
From: Bob Perkinson <bobperk90658@bellsouth.net>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, Jan 11, 2011 7:43 pm
Subject: [FlyRotary] Re: Broken Tension Bolt ... update
If you already have an off center hole in the bolt, getting another hole on center will be almost impossible. The drill bit will always got to the point of least resistance, and the mechanical shock of the bit
grabbing one side of the hole could break the bit. I know, did that years ago. I would have to agree with Mark, tearing it down might be prudent.
Bob Perkinson
RV-9 13B
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, January 11, 2011 1:00:56 PM
Subject: [FlyRotary] Re: Broken Tension Bolt ... update
At this point I believe that I would bite the bullet and disassemble the engine. Those irons are too expensive to risk damaging.
On Tue, Jan 11, 2011 at 12:35 PM, Jeff Whaley <jwhaley@datacast.com> wrote:
Hey thanks Ernest, you shouldn’t have to do that, but I won’t stop you …
I’ve ordered two long bits, 5/32” and 3/16” for inside diameter … the outside diameter you could double-check with any housing, but 3/8” is a pretty close tolerance fit.
RR#2 Carp, Ontario, Canada
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Re: [FlyRotary] Re: Broken Tension Bolt ... update
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Tue, 11 Jan 2011 13:07:28 -0500
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Jeff, send me a couple of measurements and I'll turn a collar that you can use as a guide to center the drill bit. The inside diameter would be the diameter of your bit. The outside would be the size of the hole.
From: Jeff Whaley
Sent: Tuesday, January 11, 2011 12:52 PM
To: 'Rotary motors in aircraft'
Subject: RE: Broken Tension Bolt ... update
So far no luck at getting the broken tension bolt threaded end out of the front casting. With help from Cary Beazley, we were able to back 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 having (or knowing about) LH drill bits at the time, we decided to RH drill a pilot hole for an easy-out. Drilling the hole was no problem but getting it centered was, so it’s drilled off-center
and the broken piece is now probably bottomed out in the casting. The easy-out is simply not latching onto the bolt. We’re going to borrow a bore scope to get a better look. After that I’ll have to make a long center-punch and try to make a new (centered)
pilot hole with the long LH drill bits on-order (see link) … hopefully they’ll grab onto the part and extract it, otherwise it will be an engine tear-down, which I dread at any time but at -10C it’s no fun at all.
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