Atwell,
I resemble that. Straight 40wt. works for me.
Best regards,
Ed Hamilton
Atwell Haines wrote:
> At 02:54 PM 8/6/98 +0000, James wrote:
> >Yep your gear box will need an oil chainge every 3000 miles if less.
> >Engin oil is not designed for use in a gearbox. The 90W oil is ideal
> >for the Spitfire. It needs the high sulpher content to stop the metal
> >wearing. The gearbox oil is not stressed by the High Pressures in the
> >gearbox where as the engin oil will be cut up.
> >
>
> Before Ed Hamilton (and others) jump in here, I'll tell you the findings:
> modern 90W gearbox oil is TOO SLIPPERY for the Spit overdrive box. If you
> put it in you will feel it slipping in Direct Drive when starting from a
> standstill.
>
> The List wisdom is to use a good straight 40 or 50 weight engine oil. This
> will provide the viscosity the pump needs to work. What is the longest
> any Listers have used this in a gearbox?
>
> Generically speaking, James is right, "hypoid" gear oils are made to
> protect the sliding surfaces of gears, and should be used when specified.
> But the O/D trans in the Spit seems to be an exception.
>
> I wouldn't advise using a multi-viscosity like 20W50, though. Use the
> straight weight stuff. You may have to go to a speed- or race-shop to get
> it.
>
> To learn more than you ever wanted to know about lubricants, spend some
> time reading the articles by Red Line Oils on the Triumph maintenance pages,
>
> http://www.vtr.org/maintain/maintain.html
>
> Sincerely,
>
> Atwell Haines
> '79 Spitfire FM96062 UO
> Succasunna, NJ USA
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