Hi David,
Just because you found this on the internet, does'nt mean it's the
gospel! I've
gotten over100K on my rebuilds and have sold them out of the car because
the
customer liked the feel and lack of sound so much. This was all done
with engine
oils for it's life. So much for the 30K life on these boxes as he
states.
Many modern manual gearboxes use automatic transmission oil in them so
his
statement that engine oil, and it's implied lack of gear lubricity,
doesn't hold
much water with me. Automatic transmission fluid has it's own level of
slipperyness or lack of it as per its classification and specification
by the
manufacturer, admittedly different than engine oil.
Engine oil would still be my choice of lubricant in the Spridget gear
boxes.
There are also a lot of silver and gold seal boxes in Spridgets that are
really
Morris Rib Cases with it's set of bronze bearings instead of needle
bearings, so
I would suggest staying away from all the gear oils available in this
gearbox and stick with engine oil.
Using a magnetic drain plug is also a good move.
Paul A
David Dycus wrote:
> Hmm. The concensus here seems to be to use
> 20/50 or 30 weight oil. I'm just curious what you all think of the
following
> statements, found on this web site:
> http://www.a-series.org.uk/inline_gearbox.htm
>
> "Modern gear oils are much, much better, so if you want that quiet 1st
gear
> to remain quiet, don9t put engine oil in the gearbox. Engine oils and
gear
> oils are now quite different, having large quantities of different
additives
> designed to perform completely different tasks, and most engine oils
are
> simply not suitable for the gearbox."
>
> and,
>
> "To cut a long story short, modern engine oil is unsuitable, as are
oils
> designed for hypoid back axles. An API GL4 specification gear oil is
best,
> such as "Castrol EP-80" (SAE 80W); furthermore this oil has the right
> viscosity. EP-90 would probably also work well, particularly if a
thicker
> oil was desirable (leaks or noise). GL5 oils are high in sulphur, and
should
> therefore be avoided"
>
> --
> -Dave
> '67 Sprite Rustbucket
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