Oil leak around final gear drive?

[Grape_salad]

I've noticed that I've got a bit of an oil leak around the final drive. It's not too bad - no oil dripping on the floor under it, but it is seeping out. I've noticed there's a hole on the underside which seems to be the source of a lot of it - anyone have any clues as to what is causing this? Anything to be concerned about? I just got back from a ~1000km trip and there is noticeable more oil on the underside than there was before I left.

I did change the final drive oil about 6 months ago - I don't think it's related as it didn't start happening immediately after i did that.

 

[bimota]

its probably the seal on the inside of the pumpkin alot on here have had to change it, few threads on here about it, if you take the wheel off and look at the inside of the pumkin you can see the seal about £18 easy job the usually pull the old seal out with a sel tapper screw

rob

 

[bimota]

here you are

rob

 

[holligl]

If it is coming out the weep hole, which is what it looks like to me, it maybe the front seal which is harder to replace. A special socket is needed to remove the bearing retainer nut. Clean it up and try to determine which side the oil is coming from. If it is a slow leak, you can keep riding, just check the level now and then. If it starts leaving oil on the ground, then you need to do something. Like Rob said the side seal is quick at easy.

 

[Cycledude]

Or maybe you over filled it ? Definitely don’t rotate the wheel while filling because that will load the gears with oil so it will be over filled.
Or used synthetic oil ? Synthetic is much more likely to leak than regular oil.

 

[Scott F]

Or maybe you over filled it ? Definitely don’t rotate the wheel while filling because that will load the gears with oil so it will be over filled.
Or used synthetic oil ? Synthetic is much more likely to leak than regular oil.

Why is synthetic more likely to leak? This is interesting; I am not questioning you, just asking a question.

Sent from my SM-S906B using Tapatalk

 

[Grape_salad]

its probably the seal on the inside of the pumpkin alot on here have had to change it, few threads on here about it, if you take the wheel off and look at the inside of the pumkin you can see the seal about £18 easy job the usually pull the old seal out with a sel tapper screw

rob

Thanks, that was an incredibly useful video. I'm not seeing any leaks around the axle though, so I don't think it's the output side seal on the pumpkin. I'm leaning more towards what @holligl said about the seals on the drive shaft:



@Cycledude - I don't think I overfilled it, but can't rule it out. Wouldn't the gears though be filled with oil when checking the level and topping off as part of regular inspection? I saw no signs of leakage around the breather.

I used Castrol Axle EPX 80W-90, which is API GL-5 spec. Unclear if it's mineral or synthetic, but since it isn't advertised as synthetic, I'm inclined to think it is mineral based. I too am curious as to why synthetic oils are more prone to leaks?

 

[holligl]

Here is the thread for the front seal and o-ring. I did not replace the flexible shaft seal as it looked OK. If you have many miles you probably have a groove worn in the coupler gear. Some don't worry about it. I replaced mine. One on here was able to replace the seal without removing the bearing retainer nut. Mine was a bear to get out, and @eemsreno had the tool.

Final Drive Front Seal and O-ring Replacement

First - thanks to @eemsreno for special tools, shop, and assistance in doing this job. If your whole rear wheel looks like this from oil weeping from the bottom of the swing arm it is most likely a bad seal and/or O-ring in the front of the final drive. It was a slow leak. I needed to add a...

www.yamahasupertenere.com

 

[bimota]

this may help to

rob

 

[Bigguy136]

I had the coupler get a groove worn in it but seal was good. Here is a link to the coupler and repair. After 2 couplers and fix, I now have 98,000 miles on my factory original seal. Something to check when you have it apart.
Super Tenere Gear Coupling Keeps Wearing Out. Fixed.... | Yamaha Super Tenere Forum