fixed cup removal - help please!?

orbeas":3et80x9v said:

before trying all the differant methods, , have you tried warming up bottom bracket shell first, using either a hot air gun or a gas burner, this will have the effect of breaking the seal between casing and the cup, also a few squirts of WD40 help.

you may have to do it a few times

the ultimate tool to make, is a length of screwed rod that fits inside the hole in the cup, and is approx 4 inches longer then the width of the bottom bracket. you need 4 nuts to fit the screwed rod.
fit 2 nuts to one end of the screwed rod and weld both nuts to the screwed rod.
fit the third nut and screw down approx 2 inches onto the screwed rod and weld onto the rod.
to remove a tight cup form either side of the bottom bracket, fit the screwed rod from the inside of the cup fit the 4th nut with a washer and tighten,
on the fixed cup, which is left hand thread, this will undo the cup.
to remove the adjustable cup, tighten the nut against the cup and use the 2 welded nut to undo it.

have had my tool for over 30 years and its still as good as the day it was made and has removed tens of b/bracket cups.

Click to expand...

GarethPJ":2pxcwzz7 said:

I independently arrived at the same method as the late great Mr Brown, with a slight variation. I didn't have a socket that would fit. So the solution I came up with was a nice long bolt with a tube as a sleeve on the bolt so I could get a spanner on both bolt ad nut to tighten it fully.

Once completely tightened it didn't take too much force to move the cup. Having said that I did use a five foot steel tube over the handle of my adjustable as a breaker bar! Since then I've always used this on fixed cups.

One important thing though, tighten the nut and bolt as hard as you can before attempting to remove the cup. If it's not tight enough it might slip suddenly and you don't want that to happen when you're leaning 13 stone on the spanner!

As for the heat method it's not particularly reliable. Better to apply a few well judged taps with special workshop tool #1 to the cup first. If there's something like rust "gluing" the components together this will break it. The heat method will work nicely on things like old grease, but it is unlikely to work well on rust. If you could heat the shell without heating the cup it might work, but that is very difficult without specialist equipment. I've worked in engineering shops where they have the kit to freeze one component while heating the other, but it would be fairly difficult to improvise at home.

Cheers,

Gareth

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GarethPJ":3gke24bz said:

The heat method will work nicely on things like old grease, but it is unlikely to work well on rust.

Click to expand...

pigman":2qiz20n3 said:

one other thing to add, you probably know this but just in case.
english is a left hand thread, so undo clockwise. Italian is the opposite, french I dont know?

Click to expand...

pigman":1qz3piq5 said:

one other thing to add, you probably know this but just in case.
english is a left hand thread, so undo clockwise. Italian is the opposite, french I dont know?

Click to expand...

Dead Rats":1qs7hys4 said:

orbeas":1qs7hys4 said:

before trying all the differant methods, , have you tried warming up bottom bracket shell first, using either a hot air gun or a gas burner, this will have the effect of breaking the seal between casing and the cup, also a few squirts of WD40 help.

you may have to do it a few times

the ultimate tool to make, is a length of screwed rod that fits inside the hole in the cup, and is approx 4 inches longer then the width of the bottom bracket. you need 4 nuts to fit the screwed rod.
fit 2 nuts to one end of the screwed rod and weld both nuts to the screwed rod.
fit the third nut and screw down approx 2 inches onto the screwed rod and weld onto the rod.
to remove a tight cup form either side of the bottom bracket, fit the screwed rod from the inside of the cup fit the 4th nut with a washer and tighten,
on the fixed cup, which is left hand thread, this will undo the cup.
to remove the adjustable cup, tighten the nut against the cup and use the 2 welded nut to undo it.

have had my tool for over 30 years and its still as good as the day it was made and has removed tens of b/bracket cups.

Click to expand...

Hi and thanks for the advice! Do you have a photo you could post of this tool?

Click to expand...