louky

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?

Amazon.com : Park Tool (109917) HCW-5 Lock Spanner : Bike Hand Tools : Sports & Outdoors

Chuck M 

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.

FBinNY 

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.

louky

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 )

Chuck M 

You will never know if it is done right in the age of Internet forums. People will debate argue if leaving the fixed cup on the other side alone or removing it too is the right way. I'm middle of the road on it. If it comes out great, but if it is going to take a lot of force and I'm not painting the frame, I leave well enough alone.

Kontact

This is a very standard BB type. Please go to the Park website and read the tutorial, then buy the correct tools. The questions you're asking suggest you are about to damage something out of a lack of familiarity.

smd4

Those dust covers are plentiful on eBay, should you damage it.

JohnDThompson 

It should unscrew. It helps to spray with penetrating oil prior to removal, especially if it has not been serviced in a long time. Some of those caps are plastic, and become quite brittle with age, and may shatter when you try to unscrew it. If that happens, drive out the shards (if any) with a hammer and punch, taking care not to damage the extractor threads.
Yes, looks good.
The Park HCW-11 is a tool designed for this task.

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.

maddog34

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.

canalligators

Actually, you must remove the bolt or nut.

maddog34

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.

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?

grumpus

This sort is supposed to unscrew; I use something like the edge of a cone spanner, but the caps are usually brittle and easy to damage. There are others that are push-in/pry-out which don't get stuck, but tend to fall out.It's the right sort of tool, but I don't think there was ever a standard for bottom bracket lock-rings (beyond the de facto Campagnolo one) so the fit may not be great. The listing details some dimensions which might give you a better idea of how well it will fit.There are spanners like this but again no standard to guarantee that it will fit. As long as it moves freely an adjustable wrench should be fine.

smd4

You can service a bottom bracket without pulling the crank arms?

grumpus

He's talking about what happens when a crank cap breaks leaving its threaded part in the crank.