mrv 

I’ve removed DS BB cups before. Even using my work bench vice.
I’ve convinced myself I’m spinning the whole deal the right way. See second pic.
Before I cook the paint with a torch, has anyone else has to resort to applying heat to break things loose? I’m thinking a small amount of heat just on the cup might not hurt too much.

I’ve been trying to soak with pb blaster and penetrating oil as well. No Joy.

Troul 

with a hefty metal chisel & a BFH, smack the flat using a downward [loosen] approach. Avoid hitting the frame at all cost.

dsbrantjr

Heating the cup will make it tighter in its bore, you want to cool the cup and/or heat the bottom bracket shell to loosen the fit.
How about a hot air gun vs a torch? Or maybe cold spray on the cup?

soyabean

Don't waste time with the hot gun. Not enough.

Go straight with mapp gas torch. Put the flame inside the BB, not the outside which will burn the paint.

I've removed hundreds of stubborn cups like these.

If you don't want to save the old one and prefer to do things cold, cut it out with a sawzall or dremel

mrv 

My thinking was to heat the cup to get it to expand in the BB-shell. Then after it cools, the bond between the shell and the race "should" be broken.
A heat gun is a good idea.
I don't want to put torch to the paint. The paints far from perfect, but I had no plans to paint. The whole deal was free, basically a bike with no seat, rusted chain, busted cranks.... https://www.bikeforums.net/22340362-post14509.html

I'm looking to make it my trail bike, as cheap as possible.

soyabean

Another cold uninvasive method is fill an automotive oil changing tray full of diesel fuel, drop the BB in that and let it sit for a week.

Believe it or not, a lot of penetrants have diesel as an ingredient.

soyabean

It might work. It's your time to kill, try it.

I've done so many seized BBs, that never works 19 out of 20 times, so now I always just go straight to the torch.

soyabean

Assuming you ave the right tool for that, did you try it with a 6' cheater bar?

dsbrantjr

There's always the old Sheldon Brown fixed-cup tool method: https://www.sheldonbrown.com/tooltips/bbcups.html
or a supposedly improved version: https://arcady.genkin.ca/2016/03/an-...-removal-tool/

cxwrench

Definitely.
Or this...leverage sometimes makes these things seem a LOT less tight.

squirtdad

this is my vote, has not failed me. Also I really like Freeze-off penetrant that also give cold shock

MudPie

I actually look forward to the day I need to use one of these home made removers!

soyabean

Well if you don't have the tools, the home made bolt-pipe-washer-nut tool can be used to clamp onto a stubborn BB cup, and you use a wrench+cheater to turn the home made bolt assembly that is clamped onto the BB.

But unless you already have a bucket of misc fasterners to make that home made tool, the cost to grab them all will cost the same as the Park Tool.

How much do you think just one washer with a 5/8" hole costs today? It ain't 25-cents.

Bill Kapaun

Lay the bike on its side, cup down.
Squirt some penetrating oil from the "top" and allow to run down the sides of the shell. It'll puddle at the cup/shell intersection and make kind of a reservoir.
Repeat multiple times every "so often". (during TV commercials etc.)
TAP the cup with the end of a box wrench and try to "ring" the cup. The vibrations help the PO to work its way in through capillary? action.
Use tools show in pics. Hasn't failed me yet,

MudPie

I didn't think Park made such a tool like Sheldon's design. So I'm not sure how much such a Park tool would cost. Sheldon's article says his hack replicates a $40 tool (and I assume that price is at least 10 years old).

A quick check at Home Depot lists flat steel washers for 5/8" screw at $1.28 for a pack of four.

dedhed

Is it just me or does that seem like a really big hole for a square taper spindle?

Andrew R Stewart 

IIRC these cups has a "rubber" seal that rode on the cup's axle hole ID. You can see the relief that has been cut into the face. The missing seal would have taken up a couple of mms or more of the hole's diameter. Andy

mrv 

Used a narrow flame with my MAP torch.
Not sure if it helped
Smacked the flat with a chisel. Had a hard time getting a confident swing.
Gave up to go to church for a bit.
Remounted it in the Vice, but vertically using the edge of the jaws instead of the tops.

got it.
thanks everyone. I know there’s about 10,000 posts with this same question…

cyccommute 

For future reference, consider this post I made about a year ago. Taking the fixed cup off first makes a lot more sense since you can clamp and stabilize the cup better using the axle spindle than without it.

soyabean

Awesome!

MAP gas is much hotter than propane and that loosened everything for you.

Now you know what to do again next time. Don't pay attention to the haters.

soyabean

Don't worry about it.

How about I just keep using mapp gas whenever I feel like it?

By the way, you shouldn't edit quotes, it borderlines on fake news

dedhed

Must be new around here.
Quotes are frequently edited for brevity and to eliminate unneeded sections of a post not being responded to.
P&R is famous for FIFY edited quotes.

soyabean

Got it

soyabean

Well you sure did and it got under your skin. My advice was good, so win-win

mrv 

SLICK!! I will do my best to keep that in my RAM for future reference. That would have saved a bunch of time. Thanks.