My last comments to the list on the subject, I promise:
The service bulletin appears to be dated from the early 50's since it
refers to the Vanguard, Renown and TR2. The Triumph engineers specified
90wt gear oil in "J" type overdrives as late as 1976. If there is a
supercession it would appear the gear oil recommendation supercedes the
motor oil recommendation. There may have been a good reason, maybe not.
Who really knows? Millions of service-free miles have been driven with
90wt and (I assume) various grades of motor oil so it may not make any
real difference what one uses.
I live in a fairly warm climate, and most of my TR miles have been
accumulated around here, however I did own and operate a 74.5 TR6 with
"J" type overdrive through Kansas and Kentucky winters using 90wt with
no problems whatsoever.
I notice that "old timers" seem to fancy motor oil in transmissions more
than relatively younger folks. Could it be a generational thing??
The following link is to the Triumph factory recommended lubricants for
a 75 TR6:
http://pg.photos.yahoo.com/ph/jdavis344/detail?.dir=6ea9&.dnm=a1ba.jpg&;.
src=ph
It is a photo of page 66 of the owner's handbook.
Lubed out,
Jim Davis
Fortson, GA
CF38690UO
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Hugh Barber
Sent: Sunday, February 27, 2005 5:51 PM
To: 'Sally or Dick Taylor'; 6pack@autox.team.net
Subject: RE: Overdrive oil
I have put the Laycock service bulletin in my Yahoo album, located at:
http://pg.photos.yahoo.com/ph/tr6nut@sbcglobal.net/my_photos
Hugh Barber
Hollister, CA
'73 TR6
-----Original Message-----
From: owner-6pack@autox.team.net [mailto:owner-6pack@autox.team.net] On
Behalf Of Sally or Dick Taylor
Sent: Sunday, February 27, 2005 1:08 PM
To: 6pack@autox.team.net
Subject: Overdrive oil
Sorry about the last post. which excluded the printout of the Laycock
service bulletin. Hugh Barber volunteered to send it in it's original
form, once I can get it to him.
Briefly, it shows the use of "regular mineral oil 30wt. for winter use,
and 20wt. for summer climates".
Herman feels that the hesitancy of the OD to engage when cold, was more
related to fluid flow, such as oil being too thick. He cautioned that
electrical connections should all be looked at before going to the task
of replacing the oil. Herman further recommends, if it's decided to
change oil, to use automatic transmission fluid as the flushing agent.
A/T can be used without harm, for shor periods in the TR tranny and OD.
If the car is already up on jack stands, to drain the units, add in
three pints of the A/T, and run the engine with OD engaged. Use
jackstands under the trailing arms to avoid the possibility of the axle
yokes banging against the frame, when the rear wheels are turning.
After 10 minutes or so, drain it out and go to the recommended 20 or 30
wt. oil. Residual A/T fluid will not spoil the oil. (In fact, some
racers use a 10% blend of this stuff) He prefers 20W-50 in the boxes
with OD that he builds for himself and others.
Dick Taylor
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