Removing drive side thread on bottom bracket using 36mm spanner(cup and cone type I think)

[albion]

I'm converting a 39/52 road bike to a triple chainset.
I'm needing to reduce the bottom bracket by fitting a 113mm cartridge and to achieve this and have the non drive side off so there is only the drive side cup left on(or is it cone?).

Its not the cartridge type and the tool that fits this is a 36mm spanner.
I've tried turning it clockwise(its on the drive side) and now tried putting some WD40 on.

The bikes itself has only 30 or so miles so its not as if its seized with age.
Am I doing it right?

 

[compo]

These cups are usually done up TIGHT at the manufacturing stage. You will be lucky to shift it with an ordinary spanner. Best way is a big nut and bolt. Place nut inside the cup (the nut should be big enough to almost fill the cup), screw in the bolt from the outside of the cup then use a socket and long bar, torque wrench or similar and just keep tightening the bolt against the cup. Eventually with lots of grunt , or less if you are lucky, the cup will move and unscrew.

if you don't have a big nut and bolt most engineering places will let you have one if you ask really nice. Offer to pay though, it helps!

 

[tyred]

From memory, a 5/8" bolt is the size you need. Try and get a high tensile steel bolt as a cheap one mightn't be up to the job. When doing this on a Raleigh 20, I managed to break a reasonable quality Draper socket and had to resort to a huge Stillson wrench with a 4 foot steel pipe over the handle to unscrew it.

When it did go, it gave suck a crack that I was convinced I had broken the frame.

 

[albion]

Is clockwise the right way to loosen?

(I've already confirmed to myself that it will accept a standard Shimano 68/113 cartridge)

 

[albion]

Is clockwise the right way to loosen?

(I've already confirmed to myself that it will accept a standard Shimano 68/113 cartridge)

 

[compo]

Yes, clockwise. that is why you simply just keep tightening the bolt through the nut.

as an afterthought, if you have a very solid bench vice and you can grip the cup flats in it you may be able to undo the cup using the frame as a lever as it is not very old. Good prospect of it all coming loose though and taking a lump out of the frame.

 

[RecordAceFromNew]

Is clockwise the right way to loosen?

See this.

 

[albion]

Can't be Italian, and probably is not French. (is French used of recent?)

 

[compo]

What bike is it? it is most likely a left hand thread but worth just making sure.

 

[albion]

Thankfully I managed to get a quick release to hold the 36mm cycle spanner well enough to enable the rubber mallet to do its stuff.

It took some moving. and as usual with these things it makes you first wonder if you are hitting it in the right direction.
That's the final 2 major bits of my 35 piece Lidl/Aldi tool kit made use of.

 

[compo]

Well done, glad you did it without too much hassle!

 

[biggs682]

just used this trick for the 1st time and it worked fine