That is interesting. I'll bet the earliest TR overdrives in the 1954 period
were A-Types, which were much the same as all of the Healey overdrives. That
is pretty much as I suspected. The problem doesn't seem to be viscosity, but
the EP additives. Actually I think it may be the same with the later J Types,
which had many similar components too.
Since this was such an early bulletin it appears that the aftermarket manuals,
and probably most of the dealer staff didn't pick up on it. As I stated, my
Bentley (Sorry, did I say Brooklands before?) "The Complete Official Triumph
TR6 & TR250 1967-1976" still has two lube charts specifying Hypoid, EP, HP, SP
(basically different manufacturer's names for Hypoid oil). It sure seems like
they would have had time to catch up. I wonder how many Triumph overdrives
went to their graves damned as worthless crap just because of that oversight.
Then again, they were only Triumphs...
Bill Lawrence
> Date: Sun, 15 Nov 2009 09:51:26 -0500
> From: rchaskell@earthlink.net
> CC: healeys@autox.team.net
> Subject: Re: [Healeys] Dave Dougan's overdrive part 2
>
> 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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