DIY Transmission Output seal replacement Triumph Bonneville T140V

Output seal, replacement, transmission, gearbox,sprocket,primary drive, triumph, bonneville,T140V, trap door,

[@northernspur6282]

Thanks for posting Ben..

[@jamesa6272]

I have to change this seal on my t140. It leaks oil. Maybe with this video I will be able to do it. Thanks for the video!

[@bensbritishbikes5279]

Jeez thanks James. Appreciate your feedback👍

[@jamesa6272]

Anytime. Thank you for posting the videos. I was always afraid to even touch the triumph but after seeing your videos and lunmads videos I started working on the bike. The problem I have now is oil soaking the chain when riding. I’m pretty sure its this shaft seal.

[@pauliebots]

Hey Ben. Bummed when video didn't record seal removal. I have a chain that always looks freshly oiled. Is that most likely this seal? 1970 t100.

[@matthewhalpin8351]

It's a bad start when the sprocket cover is getting the shit knocked out of it with a screwdriver, no wonder there aren't any decent engine cases left...

[@benvdh9658]

With the advent of adhesives, these covers are almost impossible to get off anymore. If you have a better technique do share.

[@TheReverb1]

Hello; how do you manage to use the socket arm (into) the socket due to the gearbox spindle touching? I saw that some people weld another socket to the big one to have the space but I do not see that in yours...thanks

[@benvdh9658]

In that video I was able to get the socket arm part way in. I have since then cut flats on the end of the socket so a wrench will fit over it

[@edgarm6640]

Ben, do you still work on these bikes? If so where are you located?

[@bensbritishbikes5279]

Have you tried the smell test? You should be able to smell if it's engine oil or transmission oil.

[@jamesa6272]

Ben's Britishbikes I will have to double check I have not rode the bike in a couple of years. I will pull the bike out soon though and investigate

[@ColinDDV]

What did you apply on the seal before you installed it ?

[@benvdh9658]

I use rtv sometimes

[@TheSamLloyd]

How did you break the seals to get them off?

[@TheSamLloyd]

And what lubricant did you use on the seals when replacing them?

[@fsyed13]

Hi, very useful video. What size socket do you use for the main drive sprocket?

[@benvdh9658]

The output shaft rear chain sprocket nut is 1 7/8 or about 48 mm

[@fsyed13]

@@benvdh9658 I read on the forums yesterday that its 1-11/16? is the 1-7/8 a little loose?

[@Cory-qi1su]

@@fsyed13 Hey Fahad, the 1-11/16 is the size of the front sprocket nut for earlier Triumphs(actually a Whitworth size but 1-11/16 is close enough), and the size for the later ones is 1-7/8, I think they made the switch for the 5-speed gearbox around '72 or so and they were switching from Whitworth to SAE around the same time.

[@hillarylevenworth8824]

A claw hammer?!?

[@sidforbrains6552]

sometimes it'a what ever you foot can reach