X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from EXHUB003-3.exch003intermedia.net ([207.5.74.110] verified) by logan.com (CommuniGate Pro SMTP 5.4c2a) with ESMTPS id 4834622 for flyrotary@lancaironline.net; Tue, 01 Feb 2011 17:06:30 -0500 Received-SPF: none receiver=logan.com; client-ip=207.5.74.110; envelope-from=jwhaley@datacast.com Received: from EXVMBX003-5.exch003intermedia.net ([207.5.74.45]) by EXHUB003-3.exch003intermedia.net ([207.5.74.110]) with mapi; Tue, 1 Feb 2011 14:05:53 -0800 From: Jeff Whaley To: 'Rotary motors in aircraft' Date: Tue, 1 Feb 2011 14:05:44 -0800 Subject: RE: Tension Bolt Extracted ... what a relief! Thread-Topic: Tension Bolt Extracted ... what a relief! Thread-Index: AcvCTaqBLZH68dHSQW+fgsxo4wiEhAADRCeA Message-ID: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: yes X-MS-TNEF-Correlator: acceptlanguage: en-US Content-Type: multipart/related; boundary="_005_C03ABB0A7362B84BB53D544B3C305E0E0179F65CCB62EXVMBX0035e_"; type="multipart/alternative" MIME-Version: 1.0 --_005_C03ABB0A7362B84BB53D544B3C305E0E0179F65CCB62EXVMBX0035e_ Content-Type: multipart/alternative; boundary="_000_C03ABB0A7362B84BB53D544B3C305E0E0179F65CCB62EXVMBX0035e_" --_000_C03ABB0A7362B84BB53D544B3C305E0E0179F65CCB62EXVMBX0035e_ Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Kelly, I'll await responses from others but I doubt that mixing bolt sizes = is an issue; the bolts were most likely beefed-up for the very reason I had= to replace this one. The necked-down bolts were prone to breaking ... My take is that the bo= lts are simply a multi-point clamp and any resonance/harmonics they produce= was an oversight on the part of Mazda engineers. Lynn, what's your take on this? Jeff From: Kelly Troyer Subject: Tension Bolt Extracted ... what a relief! Date: Tue, 1 Feb 2011 13:09:41 -0800 (PST) To: Rotary motors in aircraft [cid:image001.gif@01CBC232.43669220] [cid:image002.gif@01CBC232.43669220] 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 te= nsion bolts are necked down (smaller) in the shank area than the later 89-91 (and probably up to 95) bo= lts.............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 Sent: Tuesday, February 01, 2011 3:22 PM To: 'Rotary motors in aircraft' Subject: 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 dia= meter. Jeff From: Tracy 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 [cid:image001.gif@01CBC232.43669220] [cid:image002.gif@01CBC232.43669220] 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 > 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 exact= ly where the pilot hole was drilled into the broken piece; the left-hand dr= ill bits would not grab on and extract the part but did help in enlarging t= he 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 i= n the attached photo. The easy-out is welded to the end of the original br= oken 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 __________ Information from ESET NOD32 Antivirus, version of virus signatur= e 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 a= ddressee and may contain privileged or confidential information. Any unauth= orized 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. --_000_C03ABB0A7362B84BB53D544B3C305E0E0179F65CCB62EXVMBX0035e_ Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

Kelly, I’ll awai= t responses from others but I doubt that mixing bolt sizes is an issue; the= bolts were most likely beefed-up for the very reason I had to replace this= one.

The necked-down bolts = were prone to breaking  …    My take is that the = bolts are simply a multi-point clamp and any resonance/harmonics they produ= ce was an oversight on the part of Mazda engineers.

Lynn, what’s you= r take on this?

Jeff=

 

 

From:

Kelly Troyer <keltro@att.net>=

Subject:

Tension Bolt Extracted ... what a relief= !

Date:

Tue, 1 Feb 2011 13:09:41 -0800 (PST)

To:

Rotary motors in aircraft <flyrotary@= lancaironline.net>

3D"Message

3D"Undecoded


     Jeff,<= /o:p>

      &nb= sp; If I understand you previous reply correctly you have replaced your bro= ken 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 la= ter 89-91 (and probably up to 95) bolts.............I question mixing<= /span>

different size bolts in the same engine= (weird harmonics ??)...............Perhaps our Rotary "Guru" Lyn= n

Hanover will weigh in here with some re= al 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 Wha= ley
Sent: Tuesday, February 01, 2011 3:22 PM
To: 'Rotary motors in aircraft'
Subject: 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, l= ighter tensioned than the rest or the others are also in jeopardy.

I put a heavier spiral on the replacement bolt, whic= h 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>

3D"Message

3D"Undecoded

Looks like you needed to be much more ge= nerous with the RTV when installing.   It should look a LOT messier th= an 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 W= haley <jwhaley@dat= acast.com> wrote:

We were minutes away from an engine tear-down, when we tried one m= ore time to extract the broken tension bolt.  The bore scope allowed u= s 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 looseni= ng the threads a little.  Ultimately I was able to start an easy-out w= ith light tapping and it grabbed on – the result is in the attached photo.  The easy-out is welded to the e= nd of the original broken bolt and you can see that a spiral of RTV was app= lied to the length of the bolt between the threads and the bolt head.

Jeff

 



__________ Information from ESET NOD32 Antivirus, version of virus signatur= e database 5838 (20110201) __________

The message was checked by ESET NOD32 Antivirus.

http://www.eset.com

This message, and the docum= ents attached hereto, is intended only for the addressee and may contain pr= ivileged or confidential information. Any unauthorized disclosure is strict= ly 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.
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