Jeff,
If I understand you previous reply correctly you have replaced your broken tension bolt with a later
model larger diameter bolt..........If I remember correctly my 86-88 13B tension bolts are necked down
(smaller) in the shank area than the later 89-91 (and probably up to 95) bolts.............I question mixing
different size bolts in the same engine (weird harmonics ??)...............Perhaps our Rotary "Guru" Lynn
Hanover will weigh in here with some real world advice in this matter...................May be of no concern
but better safe than sorry !!...................
Kelly Troyer
"DYKE DELTA JD2" (Eventually)
"13B ROTARY"_ Engine
"RWS"_RD1C/EC2/EM2
"MISTRAL"_Backplate/Oil Manifold
"TURBONETICS"_TO4E50 Turbo
From: Jeff Whaley <jwhaley@datacast.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Tue, February 1, 2011 2:21:53 PM
Subject: [FlyRotary] Re: Tension Bolt Extracted ... what a relief!
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
|
From: |
Tracy <tracy@rotaryaviation.com> |
|
Sender: |
rwstracy@gmail.com |
|
Subject: |
Re: [FlyRotary] Tension Bolt Extracted ... what a relief! |
|
Date: |
Tue, 1 Feb 2011 12:47:16 -0500 |
|
To: |
Rotary motors in aircraft <flyrotary@lancaironline.net> |
|
|
|
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 |
Jeff Whaley
Manager, Test and Repair
International Datacasting Corp.
Tele: 613-596-4120 (ext: 2295)
Fax: 613-596-9208
www.datacast.com
__________ Information from ESET NOD32 Antivirus, version of virus signature database 5838 (20110201) __________
The message was checked by ESET NOD32 Antivirus.
http://www.eset.com
This message, and the documents attached hereto, is intended only for the addressee and may contain privileged or confidential information. Any unauthorized disclosure is strictly prohibited. If you have received this message in error, please notify us immediately so that we may correct our internal records. Please then delete the original message. Thank you.