X-Virus-Scanned: clean according to Sophos on Logan.com X-SpamCatcher-Score: 30 [X] Return-Path: Sender: To: lml@lancaironline.net Date: Sun, 15 Apr 2007 18:57:20 -0400 Message-ID: X-Original-Return-Path: Received: from alnrmhc11.comcast.net ([206.18.177.51] verified) by logan.com (CommuniGate Pro SMTP 5.1.8) with ESMTP id 1986735 for lml@lancaironline.net; Sun, 15 Apr 2007 14:24:08 -0400 Received-SPF: none receiver=logan.com; client-ip=206.18.177.51; envelope-from=nrgarvin@comcast.net Received: from gateway508ge (c-71-234-78-160.hsd1.ct.comcast.net[71.234.78.160]) by comcast.net (alnrmhc11) with SMTP id <20070415182319b1100kbb6se>; Sun, 15 Apr 2007 18:23:19 +0000 From: "Neal Garvin" X-Original-To: "'Lancair Mailing List'" References: Subject: RE: [LML] Re: 360 wheel bearings X-Original-Date: Sun, 15 Apr 2007 14:23:44 -0400 X-Original-Message-ID: <001501c77f8b$381943b0$6501a8c0@gateway508ge> MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_0016_01C77F69.B107A3B0" X-Mailer: Microsoft Office Outlook 11 Thread-Index: Acd/aPeOoOQbT1DFQJS0P7FTkQ6xpgAIML8w In-Reply-To: X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.3028 This is a multi-part message in MIME format. ------=_NextPart_000_0016_01C77F69.B107A3B0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit FYI, Tapered roller bearings are required to have a certain amount of pre-load for proper operation. The roller and race stresses will change significantly if improperly pre-loaded, either with to little or to much preload. Any axial free-play is definitely bad. If you make some type of inner-race spacer, frequent bearing inspections is a good idea until you are comfortable there is no premature wear, spalling or localized overheating. From Bob's description and 10 years of service it looks like he got it right. _____ From: Lancair Mailing List [mailto:lml@lancaironline.net] On Behalf Of marv@lancair.net Sent: Sunday, April 15, 2007 10:19 AM To: lml@lancaironline.net Subject: [LML] Re: 360 wheel bearings Posted for "Bob B." : On my 235 I was unable to prevent the inner race of the wheel bearings from rotating on the axle, even with what seemed to be an extreme amount of preload. This occurred on both the mains and the nose wheel, and caused deep wear in the GM31 spacers. The solution which has worked well for nearly ten years, was to make a spacer from a piece of tubing which fits over the axle and bears against the inside surface of the inner race of the wheel bearings. My recollection is that the spacer is about an 1.5" long. Now when the axle nut is tightened, it squeezes the bearing inner races against this spacer rather than loading the bearing. It took a bit of "test and file" to make the spacer the right length to take the play out of the bearings without adding too much preload. Bob Belshe Moraga, CA Lancair 235/320 http://home.comcast.net/~rbelshe/ -- For archives and unsub http://mail.lancaironline.net:81/lists/lml/List.html ------=_NextPart_000_0016_01C77F69.B107A3B0 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable

FYI,

Tapered roller bearings are = required to have a certain amount of pre-load for proper operation. The roller and = race stresses will change significantly if improperly pre-loaded, either with to = little or to much preload. Any axial free-play is definitely bad. If you make some = type of inner-race spacer, frequent bearing inspections is a good idea until you = are comfortable there is no premature wear, spalling or localized = overheating.

From Bob’s description and 10 = years of service it looks like he got it right.

From: = Lancair Mailing List = [mailto:lml@lancaironline.net] On Behalf Of marv@lancair.net
Sent: Sunday, April 15, = 2007 10:19 AM
To: = lml@lancaironline.net
Subject: [LML] Re: 360 = wheel bearings

Posted for "Bob = B." <rbelshe@comcast.net>:

On my 235 I was unable to prevent the inner race of the wheel bearings = from
rotating on the axle, even with what seemed to be an extreme amount = of
preload. This occurred on both the mains and the nose wheel, and caused = deep
wear in the GM31 spacers.

The solution which has worked well for nearly ten years, was to make = a
spacer from a piece of tubing which fits over the axle and bears against = the
inside surface of the inner race of the wheel bearings. My recollection = is
that the spacer is about an 1.5" long. Now when the axle nut is = tightened,
it squeezes the bearing inner races against this spacer rather than = loading
the bearing. It took a bit of "test and file" to make the = spacer the right
length to take the play out of the bearings without adding too much = preload.

Bob Belshe
Moraga, = CA
Lancair 235/320
http://home.comcast.net/~rbelshe/

--

For =
archives and unsub =
http://mail.lancaironline.net:81/lists/lml/List.html

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