X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from fed1rmmtao01.cox.net ([68.230.241.38] verified) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 971032 for flyrotary@lancaironline.net; Sun, 05 Feb 2006 14:25:21 -0500 Received-SPF: none receiver=logan.com; client-ip=68.230.241.38; envelope-from=ALVentures@cox.net Received: from BigAl ([68.7.14.39]) by fed1rmmtao01.cox.net (InterMail vM.6.01.05.02 201-2131-123-102-20050715) with ESMTP id <20060205192326.CVBA15695.fed1rmmtao01.cox.net@BigAl> for ; Sun, 5 Feb 2006 14:23:26 -0500 From: "Al Gietzen" To: "'Rotary motors in aircraft'" Subject: RE: [FlyRotary] Re: Torque and torque sequence Date: Sun, 5 Feb 2006 11:24:40 -0800 Message-ID: <000001c62a89$d0235360$6400a8c0@BigAl> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0001_01C62A46.C2001360" X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.6626 Importance: Normal In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0001_01C62A46.C2001360 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit When you add torque to those bolts, the bolts closest to them will go under torque. So go through the whole torque sequence several times if at all possible. This has been the case on every engine I have built. Lynn E. Hanover I don't havea Mazda Manual, but generally in a case like this there are 2 ways to tighten the bolts correctly: a) Tighten 2 opposite bolts until seated - then torque each to spec. All other bolts are tigthtened spreading out from the 2 torqued: e.g. Torque the 2 big bolts then: 1st bolt to left of one big b. - 1st bolt to the left of the other big b. - 1st bolt to the right of the one big b. - 1st bolt to the right of the other big b. - 2nd bolt to the left...... you get the idea. This way you have the pieces flat together on a "centerline" and "lay" the rest down on each side of this centerline - spreading it out so that no "wrinkles" are created.... b) A stepped sequence is shown in a manual: mostly in cross pattern and something like 10 lb/18lb/26lb Thomas; I understand the niceties of torque sequence; but it would seem that is all out the window when the engine has been run about 6 hours, many cycles to full power, and a dozen or more temperature cycles to 200-210 F; all with the two large bolts loose. As far as I know nothing untoward has happened, but how can I be sure? Al Al, didn't intend to step on your engineering prowess, you are waaaay ahead of me in that department! Hey; Thomas; You weren't stepping on my prowess (assuming I had some) at all. The info you gave is right on and your response appreciated. ------=_NextPart_000_0001_01C62A46.C2001360 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable
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When you add torque to those bolts, the bolts closest to them will go under = torque.

 

So go through the whole torque sequence several times if at all possible. This = has been the case on every engine I have built.

 

Lynn E. Hanover

 

 

 

I don't havea Mazda Manual, but generally in a case like this there are 2 ways to tighten the bolts = correctly:

 

a) Tighten 2 opposite bolts until seated - then torque each to spec. All other = bolts are tigthtened spreading out from the 2 torqued:

e.g. Torque the 2 big bolts then: 1st bolt to left of one big b. - = 1st bolt to the left of the other big b. - 1st bolt to the right of = the one big b. - 1st bolt to the right of the other big b. - 2nd bolt to = the left...... you get the idea.

 

This way you have the pieces flat together on a "centerline" and "lay" the rest down on each side of this centerline - = spreading it out so that no "wrinkles" are created....

 

b) A stepped sequence is shown in a manual: mostly in cross pattern and = something like 10 lb/18lb/26lb

 

 

Thomas;

I understand the niceties of torque sequence; but it would seem that is = all out the window when the engine has been run about 6 hours, many cycles to = full power, and a dozen or more temperature cycles to 200-210 F; all with the = two large bolts loose.  As far as I know nothing untoward has happened, = but how can I be sure?

 

Al

 

Al,

didn't intend to step on your engineering prowess, you are waaaay ahead of me = in that department!

 

Hey; Thomas;

 

You weren’t stepping on my = prowess (assuming I had some) at all.  The info you gave is right on and = your response appreciated.

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