From: "david tinker" <david.tinker@virgin.net>
To: "Stu Keen" <simbafish@comcast.net>; "MG" <mg-t@autox.team.net>
Sent: Saturday, June 28, 2003 9:59 PM
Subject: Re: Transmissions
> Hi Stu,
> It sounds as though the sleeve used was a shaft repair bush sometimes used
> for providing a better running surface for shaft oilseals, the material
used
> for the bushes may be different but the principle is the same ( Chicago
> Rawhide make a brand called Speedi-Sleeve and use stainless stl ).
>
> The thickness of the bush used in your car sounds a little thin to be
> hardened as a bush with that wall thickness may be brittle at 0.015 " but
> without a material spec it is difficult to comment. Inner races for needle
> roller bearings tend to be a lot thicker usually .100" at least.
>
> NTN Bearing Corporation stipulate minimum requirements for raceway
surfaces
> and call for materials used to have 'high hardness, resistance to rolling
> fatigue, wear resistance and good dimensional stability'.
>
> For peace of mind you may want to find the material spec of the bush used,
> but I would say that if Carl Cederstrand says its OK who am I to
disagree!!
>
> I had a similar problem with my TD where the case hardening had worn
through
> on the teeth of the gearbox cluster gear resulting in the familiar 1st/
> reverse gear groan!!. In an internet conversation with Douglas Ormrod of
New
> Zealand I learned of a machine shop in Auckland that had repaired a
cluster
> gear for him by cutting off the worn straight gear and welding on a new
one.
> Two years ago I took 2 worn gears over to Auckland on a visit and had them
> both repaired. I rebuilt my TD g/box
> in the Spring and so far have put on about 1000 miles. So far I am pleased
> with the result.
>
> Good luck
>
> David Tinker. Wales UK
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