Final drive leak? - Yamaha FJR Forum : Yamaha FJR Owners Forums
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post #1 of 8 (permalink) Old 10-24-2020, 11:49 PM Thread Starter
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Final drive leak?

I've had this '13 for 2 years and it was serviced right before I purchased her. The rear tire & rear drive oil were replaced as part of that service. While working on a different repair, I figured it was time to pull the rear wheel and check things out as I noticed black "stuff" building up on the back rim. This is what I found:

Final drive seal leak? Overfill(no evidence at vent)? Excessive lube on splines?

I cleaned everything up and let it sit apart for 2 days with no additional leakage. Drained the final drive oil and it was rather clean looking and not low or overfilled.

I'm thinking of just putting it all back together and monitor it at this point. And yes, I pulled the whole pumpkin/drive shaft out and inspected, cleaned, & lubed the splines up at the u-joint. All good there and nothing at the weep hole at the bottom inside the swingarm either.

Thoughts?

Thanks.
Attached Images
File Type: jpg pumpkin.jpg (134.3 KB, 27 views)
File Type: jpg wheel hub.jpg (161.3 KB, 31 views)
File Type: jpg wheel 1.jpg (133.6 KB, 22 views)
File Type: jpg wheel 2.jpg (132.3 KB, 21 views)

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post #2 of 8 (permalink) Old 10-25-2020, 10:32 AM
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Possible excess grease on the splines at some point. I'd clean it all up, minimal grease on splines... go ride. That may be all it is. Check it again next tire change, with perhaps a rear drive fluid level check once in a while.
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post #3 of 8 (permalink) Old 10-26-2020, 01:44 PM Thread Starter
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Yeah, it had me concerned when I first saw it, but I agree. I'll put her back together and keep a closer eye on the rim & oil level. Thanks.

I was preparing to do just that but I figured I should take the opportunity to clean things up with the rear wheel out of the way and was rushing to finish as I was running late, leaned over the back side to pick up a rag to the right of the bike and lost my balance a bit. And where did my right hand fall? Yup, right on the back brake lever and squeezed the pads together. At least it was smooth as I just lubed all those pivot points about 30 minutes before!

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post #4 of 8 (permalink) Old 10-26-2020, 02:22 PM
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When you remove the rear hub never pull on the hub as you can dislodge the seal that keeps the oil in the hub. Use a flat bladed screw driver to ease the UJ apart. The splines do not move, greasing them only assists with future removal of the hub.

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post #5 of 8 (permalink) Old 10-26-2020, 02:23 PM
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It looks like someone used the wrong lubricant for the spline. It should not be "thin" like this - almost looks like oil! I would clean the spline completely, and then add the proper moly paste - it's thick stuff and not the thin, runny stuff that's on the picture...
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post #6 of 8 (permalink) Old 10-27-2020, 10:07 AM
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Molypaste on all-the splines is the proper thing to do, it not only helps with future disassembly but the real benefit is that it keeps fretting of the splines at bay.

Fretting is the natural vibration that occurs between the splines and that fretting is a form of rust, left unchecked your splineswill simply rust away, ask any Goldwing owner if they’ve ever seen it, I have. I have a friend who has a 76 wing that he did a number if iron butt challenges on when he came to one of our CWC open house concerned with the noises coming from the differential, disassembly showed a pile of rust and little to no splines, luckily a new unobtainium driveshaft was all that was needed.

Lube all them splines with some moly paste.
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post #7 of 8 (permalink) Old 10-27-2020, 04:44 PM
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Honda insisted on the moly paste, and for good reason. The splines were on the soft side for whatever reason. FJR splines are much harder, and that's why they only call for regular grease. Moly trumps that though, don't need much more than a thin coat and you're good.
I know of Honda splines like Steve's talking about, well worn and almost no teeth left. But don't sweat FJR splines too much, I've never seen one to be concerned about very much, but do use some grease, it only makes sense to prevent metal to metal wear. Regular lithium grease will melt somewhat in higher temps, thus why the OP saw some streaking...

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post #8 of 8 (permalink) Old 10-28-2020, 02:09 PM Thread Starter
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Quote:
Originally Posted by Linton West View Post
When you remove the rear hub never pull on the hub as you can dislodge the seal that keeps the oil in the hub. Use a flat bladed screw driver to ease the UJ apart. The splines do not move, greasing them only assists with future removal of the hub.
Thanks for the tip.

Quote:
Originally Posted by mortenk View Post
It looks like someone used the wrong lubricant for the spline. It should not be "thin" like this - almost looks like oil! I would clean the spline completely, and then add the proper moly paste - it's thick stuff and not the thin, runny stuff that's on the picture...
Yeah, I had that thought too. Will definitely be using the moly when getting her back together as everyone has mentioned.

Thanks.

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