[AT] 90wt oil and fords

[Chuck Saunders]

Hi Larry,
Thanks for sharing your knowledge with me. I appreciate the time and thought
you put into your reply. I can always learn something on this list.
Chuck Saunders

On 9/6/06, Larry & Barb Dotson <dotson at loganrec.com> wrote:
>
> chuck/walt
> Copper alloys are generally referred to as "Red Metal" due to the color of
> Copper. Brass has Zinc and Tin in varing amounts. Tin changes the color to
> yellow when using a realitively high percentage. Bronze is Copper with Tin
> and Lead. Again as the percentage of Tin increases, so does the yellow
> color. Most bushings found in older tractors are either Babbitt or Bronze.
> The Lead in Bronze does not alloy with the Copper but is found in seperate
> individual pockets. Lead is very easily corroded while Tin is very
> resistant
> to corrosion. Lead is natures best bearing material for sleeve type
> bearings. It is soft and lubricating as a bearing, but has several
> weaknesses. It is very weak and requires Tin to help with the corrosion.
> Lead is also poisoness and is therefore being eleminated in most
> automotive
> engines and transmissions. Having said the above, I believe it is the Lead
> in the Bronze bushings that would be the most likely to be attached by
> some
> oil types.
>
> Larry Dotson
> Copper/Lead specialist
> Clevite engine bearings/bushings (retired)
>
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