X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 13 Dec 2009 12:31:50 -0500 Message-ID: X-Original-Return-Path: Received: from imr-ma01.mx.aol.com ([64.12.206.39] verified) by logan.com (CommuniGate Pro SMTP 5.3c3) with ESMTP id 4016122 for lml@lancaironline.net; Fri, 11 Dec 2009 18:00:01 -0500 Received-SPF: pass receiver=logan.com; client-ip=64.12.206.39; envelope-from=Sky2high@aol.com Received: from imo-da01.mx.aol.com (imo-da01.mx.aol.com [205.188.169.199]) by imr-ma01.mx.aol.com (8.14.1/8.14.1) with ESMTP id nBBMxFOT031483 for ; Fri, 11 Dec 2009 17:59:15 -0500 Received: from Sky2high@aol.com by imo-da01.mx.aol.com (mail_out_v42.5.) id q.ceb.6cbd69f6 (48600) for ; Fri, 11 Dec 2009 17:59:14 -0500 (EST) From: Sky2high@aol.com X-Original-Message-ID: X-Original-Date: Fri, 11 Dec 2009 18:04:26 EST Subject: Re: [LML] Torque for Engine Mount Bolts X-Original-To: lml@lancaironline.net MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="-----------------------------1260572666" X-Mailer: AOL 9.5 sub 155 X-Spam-Flag:NO X-AOL-SENDER: Sky2high@aol.com -------------------------------1260572666 Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Michael, The bolt should be torqued to a value specified for the bolt size. Thus, the preload will be correct for the specified bolt. While your mechanic may be right about the blanket compressing, there are other considerations. Heated Fiber glass and carbon fiber can flow a bit over time - this can cause some loosening and these bolts should be checked at each annual condition inspection. Another problem could be if more three threads show outside the nut - it is possible to torque the nut onto the bolt shoulder at the end of the threads so that it cannot tighten the parts it is fastening any more. Scott Krueger In a message dated 12/11/2009 12:42:03 P.M. Central Standard Time, mnewman@dragonnorth.com writes: The engine mount bolts on my IV-P (through the firewall) spin fairly freely when I turn them with a socket and my fingers. Does anyone have the proper torque values for these bolts? Any ideas why they might have loosened up? I have a mechanic saying that the fireproof blanket compresses over time and that this is why they loosen. ____________________________________ Michael Newman Dragonnorth Group 401 Sandy Valley Road Westwood, MA 02090 Cell: 617 821-4608 Home: 617 566-7975 Fax: 617 566-7975 _www.dragonnorth.com_ (http://www.dragonnorth.com/) _mnewman@dragonnorth.com_ (mailto:mnewman@dragonnorth.com) -------------------------------1260572666 Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: quoted-printable

Michael,

The bolt should be torqued to a value specified for the bolt size.&nb= sp;=20 Thus, the preload will be correct for the specified bolt. = While=20 your mechanic may be right about the blanket compressing, there are other= =20 considerations. Heated Fiber glass and carbon fiber can flow a bit= over=20 time - this can cause some loosening and these bolts should be checked at= each=20 annual condition inspection. Another problem could be if more three= =20 threads show outside the nut - it is possible to torque the nut onto the= =20 bolt shoulder at the end of the threads so that it cannot tighten the= parts=20 it is fastening any more.

Scott Krueger

In a message dated 12/11/2009 12:42:03 P.M. Central Standard Time,=20 mnewman@dragonnorth.com writes:

The engine mount bolts on my IV-P (through the fire= wall)=20 spin fairly freely when I turn them with a socket and my fingers. = =20

Does anyone have the proper torque values for these= bolts?=20

Any ideas why they might have loosened up? I have= a=20 mechanic saying that the fireproof blanket compresses over time and that= this=20 is why they loosen.

= Michael=20 Newman

= Dragonnorth=20 Group

= 401=20 Sandy Valley Road
Westwood, MA 02090

= Cell:=20 617 821-4608
Home: 617 566-7975
Fax: 617=20 566-7975

= www.dragonnorth.com

= mnewman@dragonnorth.com

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