I'm guessing it's Stewart.
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Third front baring gone is as many months
- Thread starter cbranje
- Start date
I'm guessing it's Stewart.
There are four parts, that works as an assembly. If one part fails, all four parts will fail. Always. Every time.
and if you know which parts of the assembly are failing first, it may be possible to deduce the cause of the failure and address that instead of just blindly replacing parts and using bearings as wearable components that don't last a month......
Ever had a smashed-up bearing apart ... They're always completely trashed. There is no telling which parts fail first.
Bearings that fail very shortly after installation almost always fail due to static overload, and static overload is almost always because of improper installation ... either incorrect (i.e. too much) preload, or incorrect alignment.
The way the front wheel bearing arrangement is designed on every motorcycle that I have ever seen, the inner races are clamped through the axle against the spacer that runs between the left and right bearings inside the wheel, and the outer races are kept the same distance apart by the distance between the machined steps that the bearing bottoms against when it is installed in the wheel. The length of that spacer between the left and right bearings has to be the same as the distance between the machined steps in the wheel on the left and right sides. This is what ensures that the bearing is not installed with excessive preload. Most common cause for extreme premature failure is that the center spacer has either been omitted when the bearings were installed, or is the wrong part (too short). We still haven't heard from the original poster, whether the center spacer is there or not. As soon as you have the front wheel off the bike, you can see whether that spacer is there, just look between the bearings and check.
Bearings that fail very shortly after installation almost always fail due to static overload, and static overload is almost always because of improper installation ... either incorrect (i.e. too much) preload, or incorrect alignment.
The way the front wheel bearing arrangement is designed on every motorcycle that I have ever seen, the inner races are clamped through the axle against the spacer that runs between the left and right bearings inside the wheel, and the outer races are kept the same distance apart by the distance between the machined steps that the bearing bottoms against when it is installed in the wheel. The length of that spacer between the left and right bearings has to be the same as the distance between the machined steps in the wheel on the left and right sides. This is what ensures that the bearing is not installed with excessive preload. Most common cause for extreme premature failure is that the center spacer has either been omitted when the bearings were installed, or is the wrong part (too short). We still haven't heard from the original poster, whether the center spacer is there or not. As soon as you have the front wheel off the bike, you can see whether that spacer is there, just look between the bearings and check.
One other small thing. Bearings that are pressed in on the outer race (i.e. wheel bearings) are meant to be installed using a tool that applies pressure only to the outer race. Never press a bearing in by hammering on the inner race if the outer race is the one with the press-fit. Doing that, statically overloads the bearing before it ever gets a chance to serve its design purpose. Often these bearings have to be hammered OUT by hammering on the inner race ... but that's why you are supposed to replace them in that case.
I thought it may be possible to identify if it failed internally (for example, the ball bearings failed) or if there is evidence of improper loading on the outside of the bearing assembly.
But ultimately, I have not had many chances to look at failed bearings.
Thanks for the small lesson.
But ultimately, I have not had many chances to look at failed bearings.
Thanks for the small lesson.
Hey guys
Just wanted to say that Ted's has made everything right under warrently as usual. Ted's has been and continues to be the only shop I recommend to people in the city.
When I picked up the bike they were super helpful showing the bearing etc, but I was glad just to get on the bike and get riding on such as nice day.
Put about 300 km's on it since the repair and it seems solid as ever.
I had a couple problems this season, including and electrical thing, which I fixed myself. Hopefully the rest of the season is issue free!
Carmen
Just wanted to say that Ted's has made everything right under warrently as usual. Ted's has been and continues to be the only shop I recommend to people in the city.
When I picked up the bike they were super helpful showing the bearing etc, but I was glad just to get on the bike and get riding on such as nice day.
Put about 300 km's on it since the repair and it seems solid as ever.
I had a couple problems this season, including and electrical thing, which I fixed myself. Hopefully the rest of the season is issue free!
Carmen
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