Final Drive Bearing Replacement

[Ossaboy2867]

I removed the differential today to replace the leaking seals. I think I may have destroyed the rear end in this thing....I noticed after I got the unit on the table and the driveshaft out, it may not just be dirt and grime causing the seal to leak. Any differential I have seen, car or bike should not have any lateral movement here.
Has anyone ever heard of these rear ends failing? I ride a ton of offroad and rip wheelies all the time on it. The last ride I had on it had no noises or nothing indicating a problem, other than the oil, which was full when I got back and noticed the oil soaked dust.

Thanks in advance, feedback welcome.

 

[Ossaboy2867]

Video of movement

 

[Jlq1969]

Video of movement

The problem must be number 11 ... when a seal fails, in 50% of that failure, the bearing is usually the cause
Probably (15) inside the fork, if it fits tightly, stop having that radial movement. the important thing would be that the pinion does not have that radial movement and in the video a small radial movement of the spring can be seen

 

[Ossaboy2867]

The problem must be number 11 ... when a seal fails, in 50% of that failure, the bearing is usually the cause
Probably (15) inside the fork, if it fits tightly, stop having that radial movement. the important thing would be that the pinion does not have that radial movement and in the video a small radial movement of the spring can be seen
View attachment 61868

Almost certain its the bearing. I can see movement in there after I removed the coupling. I need to manufacture the “specialty” tools to dig in deeper.

 

[navynuke]

Almost certain its the bearing. I can see movement in there after I removed the coupling. I need to manufacture the “specialty” tools to dig in deeper.

Mine failed while under warranty still. Took about a month due to dealer not having the special tool

Sent from my SM-G892A using Tapatalk

 

[Ossaboy2867]

Tractor supply had a socket. A little cutting on the mill, got the tool for $27.

 

[Ossaboy2867]

Yup. Bad pinion bearing.

 

[Jlq1969]

Yup. Bad pinion bearing.
View attachment 61876View attachment 61876View attachment 61877View attachment 61877View attachment 61877

What brand and what number is the bearing? ... just for curiosity

 

[Ossaboy2867]

What brand and what number is the bearing? ... just for curiosity

Brand: Koyo
Size: 6207RBB-1

 

[Ossaboy2867]

As easy as the collar came off, im betting thats what toasted the bearing. It didnt take any effort to turn the socket.

 

[Ossaboy2867]

 

[madman4049]

Current issue aside that's really clean and healthy looking internally, how many miles are on your bike? I'm curious because I believe I remember you saying you wheelie alot and ride like a hooligan, I do to so just curious. My final drive oil is usually pretty nasty and I change it every time I change engine oil.

 

[Ossaboy2867]

Current issue aside that's really clean and healthy looking internally, how many miles are on your bike? I'm curious because I believe I remember you saying you wheelie alot and ride like a hooligan, I do to so just curious. My final drive oil is usually pretty nasty and I change it every time I change engine oil.

I almost have 30k on the odometer now. I honestly believe it failed because the big seal retainer was not tight at all. I recall the manual stating that ring needs to be around 100 foot lbs? I will check when I get home. Had that not loosened up, I think it would be fine. The reason its so clean is because I had just flushed it out in September. If your curious about anything else you want me to check, let me know.

 

[gv550]

Why do you have so many Ossa engines?

 

[Jlq1969]

Brand: Koyo
Size: 6207RBB-1

Koyo is very good, but Timken is probably better. Be careful that 6207 R is a little better than 6207 only

 

[madman4049]

I almost have 30k on the odometer now. I honestly believe it failed because the big seal retainer was not tight at all. I recall the manual stating that ring needs to be around 100 foot lbs? I will check when I get home. Had that not loosened up, I think it would be fine. The reason its so clean is because I had just flushed it out in September. If your curious about anything else you want me to check, let me know.

Wow that's a whole lot less miles than I thought you were gonna say. You are correct on the torque, it is 108ft lbs I looked it up in the service manual pg 4-115. Makes sense on the recent flush thanks for answering my curiosities, good luck with the repairs.

 

[Ossaboy2867]

Why do you have so many Ossa engines?

Years ago my father and I were in to rebuilding and restoring them and those are ones we never got around to do. He has a pile of them thats for sure.

 

[Checkswrecks]

Good info so made this into its' own thread. Thanks!
fwiw

 

[Jlq1969]

Why do you have so many Ossa engines?

Good question, but I think the answer is in his name

 

[RCinNC]

Ossaboy2867, can you provide some specifics about the size of the socket you bought and what machining you did to it to make the special tool? It's good to have alternatives, just in case one of us ever runs into the same issue as navynuke and gets sidelined over the unavailability of the tool.