X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from [201.225.225.169] (HELO cwpanama.net) by logan.com (CommuniGate Pro SMTP 5.0.8) with ESMTP id 970874 for flyrotary@lancaironline.net; Sun, 05 Feb 2006 08:54:26 -0500 Received-SPF: none receiver=logan.com; client-ip=201.225.225.169; envelope-from=rijakits@cwpanama.net Received: from [201.224.93.110] (HELO usuarioq3efog0) by frontend3.cwpanama.net (CommuniGate Pro SMTP 4.2.10) with SMTP id 57789305 for flyrotary@lancaironline.net; Sun, 05 Feb 2006 09:00:18 -0500 Message-ID: <001201c62a5b$8b794950$6e5de0c9@usuarioq3efog0> From: "rijakits" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: Atkins errors Date: Sun, 5 Feb 2006 08:53:29 -0500 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_000E_01C62A31.A254AC20" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1437 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1441 This is a multi-part message in MIME format. ------=_NextPart_000_000E_01C62A31.A254AC20 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit ----- Original Message ----- From: Lehanover@aol.com To: Rotary motors in aircraft Sent: Saturday, February 04, 2006 6:28 PM Subject: [FlyRotary] Re: Atkins errors In a message dated 2/4/2006 5:56:30 PM Eastern Standard Time, ALVentures@cox.net writes: A couple of questions: Why are two of the bolts larger? What is the torque spec on these bolts for the 20B? I seem to recall 26-28 ft-lbs. I can’t get a torque wrench on the bolts without removing the re-drive, engine mount and flywheel, but I have a pretty well calibrated arm. Al 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 FWIW, Thomas J. ------=_NextPart_000_000E_01C62A31.A254AC20 Content-Type: text/html; charset="UTF-8" Content-Transfer-Encoding: quoted-printable =EF=BB=BF
 
----- Original Message -----
From:=20 Lehanover@aol.com
Sent: Saturday, February 04, = 2006 6:28=20 PM
Subject: [FlyRotary] Re: Atkins = errors

In a message dated 2/4/2006 5:56:30 PM Eastern Standard Time, ALVentures@cox.net = writes:

A couple of = questions: Why are=20 two of the bolts larger?  What is the torque spec on these = bolts for=20 the 20B?  I seem to recall 26-28 ft-lbs.  I can=E2=80=99t = get a torque=20 wrench on the bolts without removing the re-drive, engine mount and=20 flywheel, but I have a pretty well calibrated arm.

 

Al

When you add torque to those bolts, the bolts closest to them = will go=20 under torque.
 
So go through the whole torque sequence several times if at all = possible.=20 This has been the case on every engine I have built.
 
Lynn E. Hanover
 
 
 
I don't havea Mazda Manual, but=20 generally in a case like this there are 2 ways to tighten the = bolts=20 correctly:
 
a) Tighten 2 opposite bolts until = seated -=20 then torque each to spec. All other bolts are tigthtened spreading out = from=20 the 2 torqued:
e.g. Torque the 2 big bolts then: = 1st bolt to=20 left of one big b. - 1st bolt to the left of the other big = b. - 1st=20 bolt to the right of the one big b. - 1st bolt to the right = of the=20 other big b. - 2nd bolt to the left...... you get the = idea.
 
This way you have the pieces flat = together on=20 a "centerline" and "lay" the rest down on each side of this centerline = -=20 spreading it out so that no "wrinkles" are created....
 
b) A stepped sequence is shown in = a manual:=20 mostly in cross pattern and something like 10 = lb/18lb/26lb
 
 
 
FWIW,
 
Thomas=20 J.
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