Triumphrat

Thruxton

What is considered the preferred (best) oil for a T-140V transmission.
I've never seen the inside of one of these transmissions, do they have any bronze or yellow metal parts?
I know that the new gear oils (GL-5) will eat some of these metals.
In my 67 BMW I HAVE to use GL-4 oil which is hard to get.
It has me worried about the T140V








[ This message was edited by: Thruxton on 2006-09-27 17:33 ]

__________________
Crazy Old Bastard.
62 years old and I still don't know what I want to be when I grow up.
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Loud pipes are rude and inconsiderate.

Mecchanica

If it's the British "transmission", that would be the primary case and that is engine oil.
If it's the American "transmisson", then I use Mobil 1 75/90 Gear lube synthetic. I have also used BelRay gear oil with good results. The synthetic is much less hygroscopic and isn't as affected by moisture. Change it every couple of years.
You can also glue a small, powerful magnet to the inner gearbox cover and pick up a lot of the wear-inducing steel bits. Those little neodymium/iron/boron magnets are just great. I also have a couple of them stuck on the back of my oil tank, one where the returning oil hits the tank and another near the bottom screen.

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Triumph old, Triumph new, any Triumph will do.

johnnypence

word UP! those things are lifesavers. exceptionally useful and fun. Lee Valley Tool rare earth magnets

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Sic semper tyrannis

OzBloke

Thruxton,

I use Castrol 80/90 manual gearbox oil, without problems. A litre (quart in US I think) plastic bottle with the extended pullout neck is handy for getting the oil in the hole behind the kickstart, and it has a measure on it. I keep an empty one around just for this purpose.

Pete

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Per Ardua Ad Astra
(Through difficulties to the stars)

Thruxton

I've never seen the inside of one of these transmissions, do they have any bronze or yellow metal parts?
I know that the new gear oils (GL-5) will eat some of these metals.
Because of some bronze bits, my 67 BMW gearbox requires GL4 ONLY, (somewhat hard to get).
I am a bit concerned about the T140V transmission and GL5 gear oil.

__________________
Crazy Old Bastard.
62 years old and I still don't know what I want to be when I grow up.
.
Loud pipes are rude and inconsiderate.

OzBloke

Thruxton,

Yep, they do have yellow metal bits inside. Several bushes inside pinions on mainshaft and layshaft, and two bronze or brass thrust washers -one each end of the layshaft.

Pete

__________________
Per Ardua Ad Astra
(Through difficulties to the stars)

Mecchanica

All phosphor/bronze parts, no brass. No problem with synth oils. The old PU bikes had oilite layshaft bearings, but I don't know if they had any problems with corrosive oil. In my opinion, you have more to worry about with the mineral...more hygroscopic...oils. Rust never sleeps.

__________________
Triumph old, Triumph new, any Triumph will do.