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From: AMuzi <am@yellowjersey.org>
Newsgroups: rec.bicycles.tech
Subject: Re: "DO NOT DISASSEMBLE" is screaming "Disassemble me!"
Date: Thu, 23 May 2024 08:03:00 -0500
Organization: Yellow Jersey, Ltd.
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On 5/23/2024 12:09 AM, James wrote:
> Shimano BBR60 has a warning on the plastic bearing cover, 
> "DO NOT DISASSEMBLE", that of course makes me want to 
> disassemble the damn thing, especially as the bearings feel 
> like they need a clean and re-grease.
> 
> https://www.amazon.com/SHIMANO-BBR60-Ultegra-Bottom-Bracket/dp/B00CABINCY?th=1
> 
> So I did.  Well, enough to properly clean and re-grease the 
> bearings.
> 
> The plastic bearing cover has a lip that makes it very 
> difficult to remove without damaging it.  I found an 
> appropriately sized socket that encourages the plastic to 
> compress sufficiently that it just pops out. The slight 
> taper at the mouth of the socket squeezes the plastic.
> 
> Once that is out, with a plastic pick you can carefully 
> extract the outer seal.  There is also an inner seal.  As my 
> frame has an enclosed BB shell, I see no need for internal 
> seats (and the BB has a plastic shell with o-ring seals as 
> well).  So with 2 appropriately sized sockets, I pushed the 
> bearing a few millimeters out, and removed the inner seal 
> and threw it away.  I used my bench vice for a bearing press.
> 
> Then I could properly clean the bearings.  Again with a 
> socket I pushed the bearing back in, flushed it clean and 
> re-greased it.  Then pop the outer seal back in and the 
> plastic bearing cover over the top.
> 
> Re-assembled on the bike and the cranks turn beautifully.
> 

Good technique.
I found a clay/wax sculpting tool while looking for 
something else at an art supply years ago. The diamond end 
is just perfect for lifting bearing seals:

https://www.pcmag.com/articles/how-to-detect-ai-created-images
-- 
Andrew Muzi
am@yellowjersey.org
Open every day since 1 April, 1971