Swing arm preload.
-
Deleted User 287
Re: Swing arm preload.
I'm proud to say I never messed up the threads on any of my swingarm pivots!
Re: Swing arm preload.
Still haven't got to your page Duane but it's still early Sunday morning here and I've been busy over at ADV theorising about the solder method for tranny shimming.
Never heard of aluminium pins either.
I have used the wheel wobble test to assess swing arm preload. That is, after being 100% confident there was no wheel wobble after conducting the wheel wobble test. Damn I get mesself tied up in knots trying to explain things sometimes.
Never heard of aluminium pins either.
I have used the wheel wobble test to assess swing arm preload. That is, after being 100% confident there was no wheel wobble after conducting the wheel wobble test. Damn I get mesself tied up in knots trying to explain things sometimes.
Lord of the Bings
Re: Swing arm preload.
Ok Duane, so I read your thoughts on setting swing arm preload. I believe that I achieve the same ' minimal amount' of load on the bearings.
Lord of the Bings
-
Duane Ausherman
- Posts: 6008
- Joined: Thu Aug 12, 2010 12:39 pm
- Location: Galt California
- Contact:
Re: Swing arm preload.
BMW came out with the /5 and applied a lot of the /2 ideas, even if they didn't apply.
One very good example is the spacing of the tapered wheel bearings. The way that they explained and did it on the /2 was sort of OK. We had very few failures, even though the method was a bit flawed.
On the /5 it was quite a different situation. The steel bearings were an interference fit in the hub. The difference was that the /2 hub was steel and the /5 was aluminum. Big difference, but they treated it the same as if it still was going to pull a hack. The hack requirement of the /2 sort of dictated some of the design. It was quite a screw-up.
The setting of the swing arm was quite similar. On the /2 the bearings took a great load with hauling a sidecar around. The side forces are quite great compared to a solo bike. The /5 swing arm bearings can get away with far less torque and in fact fails quickly with that great of torque.
Keep in mind that they were undergoing a great legal battle over the wobble issue and got very shy of lawsuits. People were getting injured and worse from all over the world due to the wobble issue. The world's largest BMW Motorcycle club, the BMWMOA, was seriously talking about a class action suit. I was quite involved and got quite a bit of inside information on that one. BMW paid out some $$ over at least one local "wrongful death" lawsuit in which I was the expert witness.
It wasn't a nice time for any of us BMW dealers or riders.
One very good example is the spacing of the tapered wheel bearings. The way that they explained and did it on the /2 was sort of OK. We had very few failures, even though the method was a bit flawed.
On the /5 it was quite a different situation. The steel bearings were an interference fit in the hub. The difference was that the /2 hub was steel and the /5 was aluminum. Big difference, but they treated it the same as if it still was going to pull a hack. The hack requirement of the /2 sort of dictated some of the design. It was quite a screw-up.
The setting of the swing arm was quite similar. On the /2 the bearings took a great load with hauling a sidecar around. The side forces are quite great compared to a solo bike. The /5 swing arm bearings can get away with far less torque and in fact fails quickly with that great of torque.
Keep in mind that they were undergoing a great legal battle over the wobble issue and got very shy of lawsuits. People were getting injured and worse from all over the world due to the wobble issue. The world's largest BMW Motorcycle club, the BMWMOA, was seriously talking about a class action suit. I was quite involved and got quite a bit of inside information on that one. BMW paid out some $$ over at least one local "wrongful death" lawsuit in which I was the expert witness.
It wasn't a nice time for any of us BMW dealers or riders.
Ask the Indians what happens when you don't control immigration.
-
Deleted User 287
Re: Swing arm preload.
Do you have a section on your website for these stories, Duane?
-
Steve in Golden
- Posts: 3096
- Joined: Tue Aug 03, 2010 4:30 pm
- Location: Golden, CO USA
Re: Swing arm preload.
But Duane, he has music from "echo and the bunnymen" in his video. He must be a good mechanic!Duane Ausherman wrote:I just edited my post.
after watching that one video, I wouldn't allow him to change a spark plug on my bike.
I just watched the video on valve adjustment. It might be slightly better than the other video.
He completely ignored the main reason for adjusting the valves. It is a diagnostic procedure to see if the top end is stable.
I am in shock.
-
Ray from Indiana
- Posts: 129
- Joined: Fri Sep 03, 2010 6:37 pm
Re: Swing arm preload.
Well, I still enjoy his videos sans the language.
Some of us are talking about working on bikes, but he's doing it and running a business at it.
There's all kinds of stuff on the 'net that we should take a grain of salt and decide for ourselves if its worthwhile.
Some of us are talking about working on bikes, but he's doing it and running a business at it.
There's all kinds of stuff on the 'net that we should take a grain of salt and decide for ourselves if its worthwhile.
Re: Swing arm preload.
And, there's proof positive that you got out of BMW ownership way too early. You still had (have) many good years left. Reconsider, Rob. There's still time!justoneoftheguys wrote:I'm proud to say I never messed up the threads on any of my swingarm pivots!
Chuey
Re: Swing arm preload.
Gosh, I've always thought that the whole swing arm pivot thing was one of the easiest things to do on the bike. It's pretty much like common sense works just fine, isn't it? I'm going to watch the video so I can see what the flap is about.
Chuey........with a swingin' swing arm
Chuey........with a swingin' swing arm
Re: Swing arm preload.
I watched the video and was put off by the coarse language used in it. I use those words but wouldn't put them in a video. It is distracting at best.
Even I noticed something he should have covered in his "instruction". Fitting the clamps, especially the rear one, onto the transmission/drive shaft boot should have been discussed in my opinion.
The video guy had an opportunity to make a great video and, for sure, it could be worse. With a bit more forethought and discipline, it could be much better.
Chuey
Even I noticed something he should have covered in his "instruction". Fitting the clamps, especially the rear one, onto the transmission/drive shaft boot should have been discussed in my opinion.
The video guy had an opportunity to make a great video and, for sure, it could be worse. With a bit more forethought and discipline, it could be much better.
Chuey