Date:         Wed, 23 May 2007 21:32:28 +0000
Reply-To:     Dave Vickery <davevickery@HOTMAIL.COM>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dave Vickery <davevickery@HOTMAIL.COM>
Subject:      Re: Syncro propshaft vibration mystery
Comments: To: jones@COLORADO.EDU
In-Reply-To:  <46548EB6.5040300@colorado.edu>
Content-Type: text/plain; format=flowed

Even though you say it is fine now it sounds like the driveshaft.  Th
vibration coming on at 25 fades at 55, none at 65 and back at 70 sure sounds
likely.  Maybe someone else will know what in the front end could cause the
vibration to come & go like that.

Have you got the guts to put it up on blocks and look under it while it's
'going' 30mph?  I'd do it, but that's me.


>From: Richard A Jones <jones@COLORADO.EDU>
>Reply-To: Richard A Jones <jones@COLORADO.EDU>
>To: vanagon@GERRY.VANAGON.COM
>Subject: Syncro propshaft vibration mystery
>Date: Wed, 23 May 2007 12:57:58 -0600
>
>I need help finding the source of a vibration in my '87 Syncro.
>It started coming home from the Arizona Bus Roundup in '06.
>It feels like driving on the "wake up" strip along the edge
>of the lane, but it starts at 25, fades at 55+, comes back at 70+.
>So 60-65 is a sweet spot with no vibration.  I think it comes
>from the front, since I feel it in the seat, floorboard and
>the steering wheel.
>
>It is not wheel speed, it is faster.  Two 5-tire rotations
>and wheel rebalance show it is not tires/wheels.  All half-
>axles appear good with no CV problems.
>
>Removal of the propshaft eliminates the vibration.  But two
>known-good propshafts, one a brand-new GoWesty, show it is
>not the propshaft itself.
>
>I put in 6 new rubber mounts on the front diff and made a laser
>alignment tool to check the alignment of the tranny and the
>front diff.  Before, there was a very small horizontal misalignment.
>Now there is none.  Vertical difference is 8.5 degrees--not very
>much. Front diff points down 2.5 degrees; tranny down 6 degrees.
>
>Mounts and alignment made no difference in the vibration.  Now
>I am stumped and don't know where to look or what to do next.
>Any ideas?  Any experience with a problem like this?  Help!
>
>Pictures of the alignment tool I made (simple) and its use are at
>http://jones.colorado.edu/jones/SyncroAlign
>
>[BTW--Jorick Vandaele's post of May 9th on the syncrolist citing
>http://www.baileymorris.co.uk is very valuable.  Under Technical
>Info are some pages that show why the drive/driven have to be
>aligned in two planes and can handle difference in the third.]
>
>Richard
>Boulder

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