Anyone know which overdrive units Triumph used in 1954? There's a
service information sheet dated Oct 1954 for VANGUARD and SPORTS (page
98 at http://www.dctra.org/Files/Service_Manuals/1954bul.pdf). It states:
It has been our practice to permit the use of Hypoid Oils in our
gearboxes as an alternative to a normal Mineral Oil for hot operating
conditions.
An instance of overdrive failure, when employing hypoid oil, has been
brought to our notice and the overdrive manufacturers have stated that
this type of oil is not suitable for use with these units.
The Recommended Lubricants Overseas chart in our Instruction
Books and Service Manual gives the alternative of either Hypoid or
normal Mineral oils for gearboxes operating in the over 10 degree
Fahrenheit and over 70 degree Fahrenheit ranges. This recommendation
is not applicable where overdrive units are fitted and your garage
personnel, and customers where necessary, should be advised of the fact.
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