I think the point many are missing is that the oils that were specified by
the factories and may be superseded with "modern" substitutes is that they
are of a non detergent formulation. This formulation allows contaminants to
settle out and not be continually re-circulated, thus hastening damage.
Dave
PS It may only be anecdotal information, but Triumph quickly backed off
using 90wt in the gearboxes because of too many failures and costs to
warrant repairs. If memory serves it was during the Spitfire/TR7 era..
frogeye@porterscustom.com
Porter Customs 2909 Arno NE
Albuquerque, NM USA 87107
505-352-1378
1954 BN2 1959 AN5
Porter Custom Bicycles
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-----Original Message-----
From: healeys-bounces@autox.team.net [mailto:healeys-bounces@autox.team.net]
On Behalf Of Bob Haskell
Sent: Sunday, November 15, 2009 7:51 AM
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.
Healeys@autox.team.net
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