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Old 11-19-2014, 07:47 AM   #1
Patrick M OP
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G/S Drive Shaft U-Joint Flat Spots

I'm currently in the process of doing rebuild on my G/S and prepping everything for paint. I took to my swing arm to a local BMW tech who has the tool to remove the cush drive. Upon removal he noticed a couple noticeable flat spots in the u-joint.

I'm wondering if the flat spots are beyond the normal range of motion that this u-joint travels. Then again, I'm not sure if I want to take the chance by not having it repaired.

Has anyone ever experienced this in the mono driveshaft? As built, the u-joint isn't easily serviced.
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Old 11-19-2014, 08:05 AM   #2
Rucksta
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Yep they seem to do that.
I did 3 warranty replacement in the first year of ownership.
It seems I was being excessively concerned about slight notching

Now that you have the shaft out get the U-Joint replaced with a serviceable item.
It's cheap peace of mind.
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Old 11-19-2014, 08:18 AM   #3
CptImagine
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Guy Henderson rebuilt one for me, fair price, quality work and quickly done . He suggested not putting the seals on the u-joints . Allowing the shaft oil to migrate into the needles . Works for me .
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Old 11-19-2014, 08:22 AM   #4
Rucksta
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That special tool isn't so special

It's possible to build one out of threaded rod, some plate and a couple of large washers




Even if you are crap with a stick welder it still does the job



I've seen prettier examples on here but this cost less than $10.00 which is less than the gas it used to cost me to drive to the place that had the tool.
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Old 11-19-2014, 08:59 AM   #5
Patrick M OP
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Quote:
Originally Posted by Rucksta View Post
Yep they seem to do that.
I did 3 warranty replacement in the first year of ownership.
It seems I was being excessively concerned about slight notching

Now that you have the shaft out get the U-Joint replaced with a serviceable item.
It's cheap peace of mind.
Interesting to know. I've always thought of the monolever's to have bullet proof drive shafts. I will be getting the u-joint replaced.

Nice tool. I'll have to make one of those if I ever need to remove the shaft again.

Quote:
Originally Posted by CptImagine View Post
Guy Henderson rebuilt one for me, fair price, quality work and quickly done . He suggested not putting the seals on the u-joints . Allowing the shaft oil to migrate into the needles . Works for me .
Good to know. I'll send him a message, I like his work. Ted Porter was also recommended to me as source for repair. Im hoping HPM's price isnt that close to the $475 for a paralever rebuild.
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Old 11-19-2014, 10:46 AM   #6
Beemerguru
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That drive shaft was also used on other mono airheads too
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