Crank bolt cover/BB
I want to disassemble this to service BB.
1) Does the crankbolt cover unscrew or pry out? I would like to not damage this if possible. 2) Is this tool what I need to remove the lockring on the BB? I know I can get it off with a punch or pipe wrench but would like to do it properly. 3) After the lockring comes off, is there a specific tool to remove the next part, or can I do it with a large adjustable wrench? https://cimg0.ibsrv.net/gimg/bikefor...6664aa6195.jpg Amazon.com : Park Tool (109917) HCW-5 Lock Spanner : Bike Hand Tools : Sports & Outdoors |
The cap should remove with a dime or large screwdriver. It may be stuck pretty well and some damage may occur. Can't say exactly but that appears to be an appropriate spanner for the lock ring. You will also need a crank arm puller.
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It's supposed to screw out. Use something wide, like a quarter. A narrower screwdriver blade will likely gouge the plastic.
Worst case, they can also be pried out without damaging the crank's threads. |
Originally Posted by Chuck M
(Post 22840882)
The cap should remove with a dime or large screwdriver. It may be stuck pretty well and some damage may occur. Can't say exactly but that appears to be an appropriate spanner for the lock ring. You will also need a crank arm puller.
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Originally Posted by louky
(Post 22840897)
Just trying to do it right (for a change :lol:)
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Originally Posted by louky
(Post 22840897)
Thanks. I do have a crank puller. I have taken this type of BB apart before, but always on bikes where it didn't matter if there were to marks left on the parts. Just trying to do it right (for a change :lol:)
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Those dust covers are plentiful on eBay, should you damage it.
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Originally Posted by louky
(Post 22840873)
1) Does the crankbolt cover unscrew or pry out? I would like to not damage this if possible.
2) Is this tool what I need to remove the lockring on the BB? I know I can get it off with a punch or pipe wrench but would like to do it properly. 3) After the lockring comes off, is there a specific tool to remove the next part, or can I do it with a large adjustable wrench? https://cimg8.ibsrv.net/gimg/bikefor...d0f07113e.jpeg If you're lucky, the cup will not be too difficult to remove, in which case a 16mm cone wrench or even an adjustable wrench may work, if you're careful. |
if it's a really old plastic cover, it will be brittle.. they crack 6 times out of ten tries.
when the outer portion of the cover breaks away, i've had to chisel the remaining threaded sections out many times. the trick is to not damage the crank's threads.... and to work within the confine created by the nut or bolt holding the crank on the spindle... Sometimes you can remove the nut or bolt first... it requires a thin walled, 14mm socket. |
Originally Posted by maddog34
(Post 22841601)
…
Sometimes you can remove the nut or bolt first... it requires a thin walled, 14mm socket. |
Originally Posted by canalligators
(Post 22841861)
Actually, you must remove the bolt or nut.
and there are times when you CAN'T remove the nut since it's trapped by the cap's threaded section and there's no room to insert a socket. i have about 75 bikes loaded in a trailer to be hauled to the scrap yard that say i know this subject well. i use a specially ordered Snap-on Flat blade Screwdriver socket to remove the slotted caps.. the tip is @ 3/4' wide... i bought that tool to adjust mower reel bearings on an old Jacobsen Gang Mower. what do you use? |
Originally Posted by louky
(Post 22840873)
I want to disassemble this to service BB.
1) Does the crankbolt cover unscrew or pry out? I would like to not damage this if possible.
Originally Posted by louky
(Post 22840873)
2) Is this tool what I need to remove the lockring on the BB? I know I can get it off with a punch or pipe wrench but would like to do it properly.
Originally Posted by louky
(Post 22840873)
3) After the lockring comes off, is there a specific tool to remove the next part, or can I do it with a large adjustable wrench?
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Originally Posted by maddog34
(Post 22842144)
actually, no, you don't... but it sure helps.
and there are times when you CAN'T remove the nut since it's trapped by the cap's threaded section and there's no room to insert a socket. |
Originally Posted by smd4
(Post 22842648)
You can service a bottom bracket without pulling the crank arms?
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