Return-Path: Received: from spdmbaaa.compuserve.com ([149.174.206.153]) by ns1.olsusa.com (Post.Office MTA v3.5.3 release 223 ID# 0-70783U4500L450S0V35) with ESMTP id com for ; Thu, 22 Feb 2001 15:48:37 -0500 Received: (from mailgate@localhost) by spdmbaaa.compuserve.com (8.9.3/8.9.3/SUN-1.9) id PAA20605 for Lancair.list@olsusa.com; Thu, 22 Feb 2001 15:57:23 -0500 (EST) Date: Thu, 22 Feb 2001 15:57:12 -0500 From: James Frantz Subject: Crankcase Breather Sender: James Frantz To: Marve Kay Message-ID: <200102221557_MC2-C67A-B707@compuserve.com> X-Mailing-List: lancair.list@olsusa.com Reply-To: lancair.list@olsusa.com Mime-Version: 1.0 <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> << Lancair Builders' Mail List >> <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>> >> In the northern lands where the air is cold ( it is -7 degrees as I write this) a common procedure is to slit the top of the oil breather line as it exits the engine crankcase. In fact on Lake Buccaners, the slit is required. Moisture from the crankcase condenses and freezes at the very end of the breather line where it is exits the cowling. In some cases the ice formation completely clogs the breather line causing the crank seal to blow out resulting in loss of engine oil. The reason for the slit in the breather line is to allow an alternate pressure relief. Higher time engines with a lot of blow by may also contribute to this problem. My Lancair 360's oil breather line never exits the cowling. It terminates 1 1/2" above the exhaust pipe where it is warm. Any oil or sludge that gets by the air/oil separator drips onto the exhaust pipe and vaporizes rather than messing the bottom of the fuselage. In my Lancair the slit is not required. Thanks Scott Krueger for bringing this important construction detail to our attention. Jim Frantz >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> LML website: http://www.olsusa.com/Users/Mkaye/maillist.html LML Builders' Bookstore: http://www.buildersbooks.com/lancair Please send your photos and drawings to marvkaye@olsusa.com. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>