X-Virus-Scanned: clean according to Sophos on Logan.com Return-Path: Received: from mail17.syd.optusnet.com.au ([211.29.132.198] verified) by logan.com (CommuniGate Pro SMTP 5.1.9) with ESMTPS id 2090078 for flyrotary@lancaironline.net; Thu, 07 Jun 2007 17:58:17 -0400 Received-SPF: none receiver=logan.com; client-ip=211.29.132.198; envelope-from=lendich@optusnet.com.au Received: from george (d211-31-221-35.dsl.nsw.optusnet.com.au [211.31.221.35]) by mail17.syd.optusnet.com.au (8.13.1/8.13.1) with SMTP id l57LvX2s031933 for ; Fri, 8 Jun 2007 07:57:35 +1000 Message-ID: <009201c7a94e$de329a70$23dd1fd3@george> From: "George Lendich" To: "Rotary motors in aircraft" References: Subject: Re: [FlyRotary] Re: For Lynn....Freshening 13B Side Housings Date: Fri, 8 Jun 2007 07:57:38 +1000 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_008F_01C7A9A2.AEB48250" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.2180 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 X-Antivirus: avast! (VPS 0657-0, 12/12/2006), Outbound message X-Antivirus-Status: Clean This is a multi-part message in MIME format. ------=_NextPart_000_008F_01C7A9A2.AEB48250 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable I use old fashioned pad cement to glue on 240 wet or dry silicone = carbide paper. It acts like a thick contact cement. Just back and forth = stripes quickly and clamp in the paper and give it a twist to spread the = glue around, than lift an edge and blow on the glue to get it curing, = then push the paper back on. Nothing else will touch the Nitride = surface. I run it flat only, and flooded with kerosene or number 2 = diesel. Just to keep the paper clean and cutting well. The idea is to = add thousands of oil holding circles.=20 Make no attempt to reduce the material along side the wear mark in th = middle of the combustion side, where the sides seals wear off the most = material. Wear over .006" should indicate a regrind and or lap job. Engines will run perfectly well = with more wear but start to use oil and loose compression.=20 Just use the same time and pressure everywhere, and all will be well. = Use a propane torch on the abrasive face to release the pad glue. This = was standard operating procedure in body shops around for years. Now the = hook and loop stuff and pre-glued pads are taking over. But nobody makes = silicone carbide in hook and loop (yet). Make sure the DA is set on orbital instead of grind. The DA in this = case means Dual Action. I didn't know that for years and used one every day. I thought it was = a brand name. Lynn E. Hanover Lynn, Having looked at that wear area on the end housings, I was wondering = if this was in excess, could we have the surface ground and then = re-Nitrited? The whole process wouldn't be anywhere near as expensive as new = housings George (down under) -------------------------------------------------------------------------= ----- See what's free at AOL.com. ------=_NextPart_000_008F_01C7A9A2.AEB48250 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable

I use old fashioned pad cement to glue on 240 wet or dry = silicone=20 carbide paper. It acts like a thick contact cement. Just back and forth = stripes=20 quickly and clamp in the paper and give it a twist to spread the glue = around,=20 than lift an edge and blow on the glue to get it curing, then push the = paper=20 back on. Nothing else will touch the Nitride surface. I run it = flat only,=20 and flooded with kerosene or number 2 diesel. Just to keep the paper = clean and=20 cutting well. The idea is to add thousands of oil holding circles. =

Make no attempt to reduce the material along side the wear mark = in th=20 middle of the combustion side, where the sides seals wear off the most = material. Wear over .006" should

indicate a regrind and or lap job. Engines will run perfectly = well with=20 more wear but start to use oil and loose compression.

Just use the same time and pressure everywhere, and all will be = well. Use=20 a propane torch on the abrasive face to release the pad glue. This was = standard operating procedure in body shops around for years. Now the = hook and=20 loop stuff and pre-glued pads are taking over. But nobody makes = silicone=20 carbide in hook and loop (yet).

Make sure the DA is set on orbital instead of grind. The DA in = this case=20 means Dual Action.

I didn't know that for years and used one every day. I thought it = was a=20 brand name.

Lynn E. Hanover

Lynn,

Having looked at that wear area on the end housings, I was = wondering if=20 this was in excess, could we have the surface ground and then=20 re-Nitrited?

The whole process wouldn't be anywhere near as expensive as new=20 housings

George (down under)

See what's free at AOL.com.=20

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