Hmmm … that’s a scary thought, as there are 15 other bolts in question. Either this one was lighter coated, lighter tensioned than the rest or the others are also in jeopardy.
I put a heavier spiral on the replacement bolt, which is also larger in diameter.
Jeff
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From:
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Tracy <tracy@rotaryaviation.com>
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Sender:
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rwstracy@gmail.com
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Subject:
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Re: [FlyRotary] Tension Bolt Extracted ... what a relief!
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Date:
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Tue, 1 Feb 2011 12:47:16 -0500
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To:
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Rotary motors in aircraft <flyrotary@lancaironline.net>
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Looks like you needed to be much more generous with the RTV when installing. It should look a LOT messier than what yours looked like. There needs to be enough to smear
off on the housings when installing.
Tracy
On Mon, Jan 31, 2011 at 12:26 PM, Jeff Whaley <jwhaley@datacast.com>
wrote:
We were minutes away from an engine tear-down, when we tried one more time to extract the broken tension bolt. The bore scope allowed us to see exactly where the pilot hole was
drilled into the broken piece; the left-hand drill bits would not grab on and extract the part but did help in enlarging the hole and perhaps loosening the threads a little. Ultimately I was able to start an easy-out with light tapping and it grabbed on –
the result is in the attached photo. The easy-out is welded to the end of the original broken bolt and you can see that a spiral of RTV was applied to the length of the bolt between the threads and the bolt head.
Jeff
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Jeff Whaley
Manager, Test and Repair
International Datacasting Corp.
Tele: 613-596-4120 (ext: 2295)
Fax: 613-596-9208
www.datacast.com