X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from smtp2.mail.ctc.net ([166.82.29.2] verified) by logan.com (CommuniGate Pro SMTP 5.0.9) with ESMTPS id 1155481 for Flyrotary@lancaironline.net; Thu, 15 Jun 2006 10:31:21 -0400 Received-SPF: none receiver=logan.com; client-ip=166.82.29.2; envelope-from=alpha@concordnc.com Received: from alphasys (65-162-57-245.quickclick.ctc.net [65.162.57.245]) by smtp2.mail.ctc.net (Switch-3.1.8/Switch-3.1.7) with SMTP id k5FEUSww015981 for ; Thu, 15 Jun 2006 10:30:30 -0400 (EDT) From: James Brewer To: X-Mailer: PocoMail 3.01 (1661) - Licensed Version Date: Thu, 15 Jun 2006 10:30:27 -0400 Message-ID: <2006615103027.279255@alphasys> Subject: Front, Rear and intermediate housings Mime-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Lynn, I have a '90 13B engine that I am rebuilding (not for aircraft use, yet). I= rebuilt an '87 engine and had the cast iron housings commercially lapped. For the '90 engine I would like to know if there is a= do-it-yourself way to lap the housings to just take off enough material to flatten them without getting into the nitride= any more than is necessary. If I recall correctly, the commercial lapping house said that they had to= take off a set amount even if it was more than the minimal amount to flatten the housing. One other question, what do you do to prepare the rotor housing before a= rebuild. Do you lightly scuff the surface or not? What do others on the list do for a rebuild? Thanks, Jim Brewer Albemarle, NC