Reason To Mark Your Driveshaft - BMW Luxury Touring Community
 
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post #1 of 10 Old Jan 12th, 2014, 7:08 pm Thread Starter
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Reason To Mark Your Driveshaft

Here is another reason to mark your drive shaft the first time you have it out. This is the second driveshaft I installed in my 2004 LT a few years ago. The paint marks used to align up. The rubber bushing has allowed the shaft to slip a little. Now I'm on my third driveshaft.
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Dave Selvig
2004 Black LT
2000 Canon Red LT



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post #2 of 10 Old Jan 12th, 2014, 7:26 pm
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Re: Reason To Mark Your Driveshaft

Dave,
Looks like time to cut back on those Wheely's.

John Baker

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post #3 of 10 Old Jan 12th, 2014, 7:52 pm Thread Starter
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Re: Reason To Mark Your Driveshaft

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Originally Posted by johnbaker15 View Post
Dave,
Looks like time to cut back on those Wheely's.
I broke a u-joint on the first shaft shifting from first to second at the rev limiter without using the clutch.

Dave Selvig
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post #4 of 10 Old Jan 13th, 2014, 8:02 am
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Re: Reason To Mark Your Driveshaft

Dave takes that slogan, "Ride it like you stole it" pretty seriously!

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post #5 of 10 Old Jan 13th, 2014, 10:49 am
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Re: Reason To Mark Your Driveshaft

And the other reason is "phasing" and a reason for many vibration issues arising after rear drives have been pulled off. Good catch Dave!

Ernie A
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post #6 of 10 Old Jan 13th, 2014, 4:29 pm
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Re: Reason To Mark Your Driveshaft

Hey Dave, just curious if the shaft is oriented so that oil contamination would run down the shaft onto the rubber dampner? Had mine out, didn't think to look or don't remember.


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post #7 of 10 Old Jan 13th, 2014, 4:56 pm Thread Starter
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Re: Reason To Mark Your Driveshaft

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Originally Posted by deanwoolsey View Post
Hey Dave, just curious if the shaft is oriented so that oil contamination would run down the shaft onto the rubber dampner? Had mine out, didn't think to look or don't remember.
I've never seen any oil on the rubber damper. The open end is downhill.

Dave Selvig
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post #8 of 10 Old Jan 14th, 2014, 12:11 am
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Re: Reason To Mark Your Driveshaft

Just a thought.
Great idea Dave to catch a slow break down of that rubber bond.
With this type of failure, do you think you could make it home just
riding with very little acceleration. Don't see it quitting with no signs.
Better to replace when convenient rather than being left stranded.
IIRC only read about this a couple of times before.
Ernie I remember reading somewhere that paralevers don't have a phasing problem. Something to do with the geometry of that type of swing arm.
However I must admit, that the times I have reinstalled the drive shaft
I do try to "get it right"
Takes a little more time and care. That's fine.
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post #9 of 10 Old Jan 14th, 2014, 7:24 am
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Re: Reason To Mark Your Driveshaft

Quote:
Originally Posted by Hilton View Post
Just a thought.
-----------------------------------
Ernie I remember reading somewhere that paralevers don't have a phasing problem. Something to do with the geometry of that type of swing arm.
However I must admit, that the times I have reinstalled the drive shaft
I do try to "get it right"
Takes a little more time and care. That's fine.
Any drive shaft section with two yoke style universal joints should be phased. The cyclic "speed up/slow down" action twice per revolution are small, but the vibrations produced can be detrimental.

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post #10 of 10 Old Jan 14th, 2014, 6:29 pm
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Re: Reason To Mark Your Driveshaft

Greetings Dave.
I'll defer to your much greater experience.
Just something I remember reading aeons ago.
The math made sense to me then, but as I said,
when I reinstall I do try to line things up.
Certainly worth trying to get it right the first time.
I would call it "best practice "

Thanks for your continued input, it is truly appreciated.

Cheers

ps Just picked up this comment over on ADVrider. Make perfect sense and makes Dave's OP comment about marking the drive to pick up creep even better. Thanks

When the bike is operating, pushing 700 to 900 lbs. of bike, rider(s) and luggage, there is constant pressure on that rubber, and the rubber just gets tired. And the driveshaft creeps out of phase, which introduces a light hammering on top of that running stress, which accelerates the wear on the rubber, which, puts it more out of phase, and the hammering intensifies, and so on, until the shaft is so out of phase those poor little u-joints can't handle it anymore.

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Last edited by Hilton; Jan 14th, 2014 at 6:42 pm.
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