All
Have more info that supports our use of 80/90 wt oil in the transmission/OD
units. Have a factory repair and operations manual. Published by, " Triumph
Motor Company Ltd, Coventry England" part # 545277, published 1972.
With respect to transmission and OD lubrication it says...
Gearbox and overdrive over 30 deg F - BP Gear oil SAE 90 EP
below 30 " " - BP Gear oil SAE 80 EP
Both are API GL4
As I remember there is a communication port (hole) between the trans and OD
units (at least on the 'A' type units). Different weight oils in the respective
units will mix with time and become whatever they mix to. Transmissions are
the same from TR2 through TR3A's. 3B through 4's had 1st gear synchronized and
possibly caged needle bearing rather than free floating ones in the counter
shaft, lot of broom handles were saved there by not needing them for bearing
support on reassembly, and different shift lever on the TR4's. Strongly suspect
TR6 trans is the same as Late TR4 boxes but have never had one apart (mine
hasn't broken yet).
This is sort of a FWIW thing. People can use whatever they are comfortable
with. I'm with Bruce using 80/90 wt. Times and lubricants have changed, may
be a 'hotter set up' out there, but this is what the book of the time said.
Bill
'70 6
----- Original Message -----
From: Bruce Simms <brucesimms2003@yahoo.ca>
Date: Friday, October 1, 2010 3:33 pm
Subject: [6pack] Proper gearcase oil
To: 6pack@autox.team.net
> I have a copy of an old Standard Motor Company service manual
> (pre J type) for
> Laycock de Normanville overdrives. It specifies 30
> wt non-detergent oil.
> It
> specifically says not to use extreme presuure gear oils as the
> "centrifugal
> effect of the planets may separate some of the additives of the
> oil and cause
> sludging."
>
> That is definitive advice.
>
> However, In my 6 I have
> Redline MT90 in my A type and I get compliments on how
> well it works. I'm
> not switching.
>
> Bruce Simms
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