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Old 04-15-2014, 08:26 PM   #1
def OP
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Paralever pivot bearings...a possible substitute?

This has been touched on before but with no resolution or much interest.

Most of us keep our GSs long enough to experience worn pivot bearings in the rear of our Paralevers. These bearings are BMW only with no aftermarket source other than the dealer.

We have two options:

1- Trot down to our local BMW shop and buy the correct BMW parts which we know will likely fail again especially if we ride our GSes the way they were intended. For my 2001 model, they're $67.00 each...pricey.
2- Install the Rubber Chicken oilte bronze bushings.

Either option has its strengths/weaknesses.

There is a third option potentially.

Why not fabricate bushings out of moly-filled Nylon? Nylon is tough, comes in a moly filled version that would potentially never need lubrication and the material is relatively low cost. The only real cost is the machining.

Someone would have to do the takeoff and engineer the tolerances to accommodate the modulus of the Nylon but, that's easy for someone familiar with plastics.

Anyone with access to a CNC lathe interested? If so, I'll furnish the material in rod form.

If this works, the Nylon bushings could last the life of the bike, require little or no maintenance and cost 1/2 of what the BMW pieces cost.
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Old 04-15-2014, 08:41 PM   #2
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Ive got a rod of the material ( nylatron 6/6), and the drawings...

and a report from a guy who did this a few years ago, last I heard they were working fine.


I have not done it myself, I am no machinist, but I could turn these with a lathe, Ill find one soon, since I need to replace my stock bushings.

this image is from a nice fellow at Pelican parts.



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mouthfulloflake screwed with this post 04-15-2014 at 10:28 PM
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Old 04-15-2014, 08:42 PM   #3
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First time you have had to replace it in 13 years?
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Old 04-15-2014, 08:51 PM   #4
aernan
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There is a website called e machine shop. They have a free easy to use client so you can design the part. After you draw it the software will tell you the coast to manufacture at whatever quantity you like. Give that a shot

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Old 04-15-2014, 09:45 PM   #5
def OP
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Quote:
Originally Posted by mouthfulloflake View Post
Ive got a rod of the material ( nylatron 6/6), and the drawings...

and a report from a guy who did this a few years ago, last I heard they were working fine.


I have not done it myself, I am no machinist, but I could turn these with a lathe, Ill find one soon, since I need to replace my stock bushings.

these images are from a nice fellow at Pelican parts.



The design you show uses the titanium pivot pins as one of the friction bearing pieces.

In my design, I would make the Nylon parts tapered so that they oscillate in use back and forth on the original steel races.

But, the machining required for your design is simpler.

I'm going to study this some more...stay tuned....
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Old 04-15-2014, 09:50 PM   #6
def OP
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Quote:
Originally Posted by aernan View Post
There is a website called e machine shop. They have a free easy to use client so you can design the part. After you draw it the software will tell you the coast to manufacture at whatever quantity you like. Give that a shot

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Thank you aernan...I'll try it.

def
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Old 04-15-2014, 10:26 PM   #7
mouthfulloflake
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Quote:
Originally Posted by def View Post
The design you show uses the titanium pivot pins as one of the friction bearing pieces.

In my design, I would make the Nylon parts tapered so that they oscillate in use back and forth on the original steel races.

But, the machining required for your design is simpler.

I'm going to study this some more...stay tuned....

It is not my design.

a fellow named "Moybin" on Pelican Parts BBS shared his ideas with me a while back.

the nylatron is self lubing, being embedded with molybdenum disulfide, he had 2 years of service without issues the last time I spoke with him.


I have been planning to do this for a while, please share your thoughts.
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