I change oil every year on engine and gearbox, diff.
Cheers
Chris
-----Ursprüngliche Nachricht-----
Von: Fot [mailto:fot-bounces@autox.team.net] Im Auftrag von
rkramer3@austin.rr.com
Gesendet: Freitag, 16. Oktober 2015 16:24
An: Dean Tetterton; Steve Yott
Cc: 'FOT Triumph'
Betreff: Re: [Fot] Gearbox thoughts
I'm another guy that dumps a lot of oil. I've used VR1 dino oil in the
crankcase and EP90 GL4 in the tranny and diff for a long time and changed it
out almost every weekend or two. This works great with the hour or less
racing I have done. I get the EP90 from Car Quest and it is jumped all the
way up to $15.00 a gallon. I understand that the EP90 I is not recommended
for use in overdrives so be careful with that. The dino oil in the
Lemons/Chump/WRl endurance TR6 boiled and left after about 4 hours so that
car now runs synthetic.
I now have a car with synthetic oils and I have let them run longer between
changes.
Bob Kramer
rkramer3@austin.rr.com
---- Dean Tetterton <tr3a58@verizon.net> wrote:
> Boy, Lots of good thoughts on this. Still lots of unknown's. Where are the
engineers, Ha!
>
> First off Glen is right, one needs to change the gear oil to keep the
> ground up piece's of metal to a minimum. Cheap to do and doesn't take
> that long. I even run a second magnetic plug in the fill hole.
> Second could not agree with Steve more. Double the bearing area is a
> good help. I have a question as to the TR4 press in bearing. Good in
> it gives more bearing area with the small rollers but I feel it
> suffers from oil flow. Is there any why to improve on that? I use them
> a lot but would feel better if I could see a way to get more oil thru
them. I have pulled apart boxes where the rollers are packed with crud.
> Third with the helical cut gears, there is a bit of pressure applied
> to the thrust washers as they try to push away from each other. Would the
needle bearings help with that? Who knows?
> Is it worth the expense? Guess the answer here is straight cut gears.
Yeah, a dog box...
>
> Still lots of questions but nice to hear what other people think. We
> need to get together with some cold one's and solve all these problems.
>
> How about a T5?
>
> Dean T
> Never stop improving the equipment.
>
>
>
>
>
> On Oct 15, 2015, at 1:49 PM, Steve Yott wrote:
>
> > I have had the opportunity to rebuild many TR gearboxes and a
> > handful of Stag boxes and would like to offer my opinion and that is
> > what it is... my opinion.
> >
> > The Stag box added a lot of complexity to the area of the laygear and
shaft.
> > The layshaft is different in that it has two outside dimensions that
> > match up to the spacers for the needle bearings. Now you have needle
> > bearings, spacers and thrust washers. I am basically not a fan of
> > this arrangement as there are many more parts to fail and the needle
bearings are known to fail.
> > Where the Stag laygear does benefit is from having two rear bearings!
> >
> > The real problem occurs when excessive torque on the single rear
> > bearing causes the bearing and or shaft to fail. Once there is play
> > in the bearing to shaft fit the laygear starts floating up, down and
> > side to side which then causes non-parallel loads on the bronze
> > thrust washers and they begin to fail.
> >
> > I have bored a good number of laygears to install double rear
> > bearings in the rear of the gear. I do not use the "open cage"
> > bearing as the TR6 uses but I use the TR4 type enclosed bearings. I
> > do this operation on all gearboxes I rebuild now because I am sold
> > on this fix. The bronze thrust washers will withstand the loads on
> > them as long as they are square with each other and the laygear end
> > float is properly set and I use no more than .006" of end float.
> >
> > Just my opinion!
> >
> > Steve Yott
> >
> > -----Original Message-----
> > From: Fot [mailto:fot-bounces@autox.team.net] On Behalf Of Dean
> > Tetterton
> > Sent: Thursday, October 15, 2015 9:20 AM
> > To: FOT Triumph
> > Subject: [Fot] Gearbox thoughts
> >
> > Since we have been thinking about gearbox's. The Stag layshaft was
> > changed by Triumph to try and make them last longer due to the
> > additional torque of the V8. They added needle bearings in place of
> > the brass thrust washers at each end and an additional bearing in
> > the lay gear at the end where 1st gear is. Has anybody tried this
> > set up in a racing box? Does it help in the wearing of the layshaft?
> >
> > The addition of needle bearings means that the spacing of the box
> > inside where the lay gear rides is greater. The needle bearings
> > being thicker than the thrust washers. This means that the Stag box is
different inside.
> > I have been able to make a tool that will cut the inside of a TR box
> > to be the same as a Stag. I plan to build a box using the needle
> > bearings. Don't at this time plan to put another bearing inside the
> > lay gear. If I make the lay gear deeper inside, I am afraid it will
> > not be hard enough for the bearings to ride inside.
> >
> > Before doing all this, has any body gone down this road before. If
> > so what has been the experience?
> > Also any body with thoughts chime in. Is it worth the effort?
> >
> > Dean T.
> >
> > _______________________________________________
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> >
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> >
> >
>
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