Sanding thrust bearing; the obvious (and overlooked?)

[Robert Mangas]

I'd say that would be best for an engine that has separate thrust bearings, 
certainly.


>From: "rob hod" <rob3 at hod3.fsnet.co.uk>
>To: <quattro at audifans.com>
>Subject: Re: Sanding thrust bearing; the obvious (and overlooked?)
>Date: Thu, 19 Feb 2004 18:45:18 -0000
>
>     I understand your just repeating someone else's words, but I'm afraid 
>I
>would class that as bad advice.
>
>     The reason being that depending on the design of engine thrust may be
>present in different directions at different times. For example the jaguar
>xk engine has a worm drive from crank to oil pump which thrusts the crank
>aft. Meanwhile operating the clutch thrusts it in the other direction. Thus
>there is no 'unloaded' side. Now I don't say that this is necessarily the
>case for the I5, maybe one side is more or less unloaded, but i'ts just not
>right to ever sand a precision bearing surface. Work on the back face
>instead.
>
>     My original suggestion back on the 5th Feb was
>    " As regards the thrust washers though, I'm under the impression that
>they
>may be made slightly thicker than stock (without being an actual oversize)
>to accomodate original production tolerances or the result of
>less-than-perfect machine shop work that has increased the width of the
>crank journal. Surely they can be ground/sanded on their *back* faces to
>fit.  Perhaps you could look into that option."
>
>and I still think this is the way to go. I'd add that often (at least for
>jag xk's) there is an option for std or 4 thou oversize thrust washers, and
>it pays to check what you've been given by the shop.
>
>  Cheers,
>
>rob
>----- Original Message ----- > Message: 1
> > Date: Thu, 19 Feb 2004 00:51:04 +0000
> > From: "Robert Mangas" <porter_t_dog at hotmail.com>
> > Subject: Sanding thrust bearing; the obvious (and overlooked?)
> > solution
> > To: quattro at audifans.com
> > Message-ID: <Sea2-F13ZjfNLnlyg3500038732 at hotmail.com>
> > Content-Type: text/plain; format=flowed
> >
> >
> >    Disclaimer:  Not my car that was being discussed last (?) week...
> >
> > I'm taking a training class this week and one of the other participants 
>is
> > the Engineering Manager for Clevite.  We got to talking bearings (go
>figure)
> > and I ran the zero thrust clearance issue by him.  He said you can sand
>the
> > bearing, as long as you sand the one that's unloaded.  Duh!  I didn't
>recall
> > hearing anyone make an observation on this important fact.
> >
> >   $0.01,
> > Robert
> >
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>
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