Removing a hex bolt that has been rounded

Gallery, Projects and General > How do I??

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Bluechip:
Chris

Poke two holes in it, then lash up a pin spanner to fit. Either from flat or on the end of some round bar.

If it's knacked you'll need a new one anyway, Cannot imagine it's impossible to get bits for a CG125. The planet was knee deep in 'em. :thumbup:

Dave BC

kwackers:
Just ring a bike shop and order one - or (heaven forbid) call in! If you're going to do your own maintenance then ringing bike shops is probably a skill you need to learn. ;-)

Assuming it's the bolt that holds the oil filter in place you want the real McCoy anyway. Chances are it's not an ordinary bolt, probably has oil ways machined into it.

Once you have one to hand there are a number of things you can do (depending on access). You could drill it and use a 'tommy bar', you could do my usual which is to use a chisel at an angle along with a small hammer and 'tap' it round (lightly!) or file some flats and use a spanner. You could even file the head off to release the oil filter and then use mole grips on the shaft. Have a look in the Haynes manual to see what it looks like under there.

Sorekiwi:
If you are using a 12 point socket, you might try a 6 point socket.

Another thought, a 15/16 socket is 23.8mm, maybe you can tap that onto the plug? Again a 6 point would be better.

Ned Ludd:
Hi Chris,
Have you got a six point socket or is it the more usual twelve point? The six point, by this I mean it has just a hexagon hole which fits the bolt, is much better for gripping soft-ish alloy caps like an oil drain plug.
Buy a new one, any Honda shop should be able to get one next day or perhaps the day after, then carefully tap the old one around with a hammer and chisel/punch. When using this method, on the underside of an engine, it is all too easy to try to turn the thing the wrong way, especially if you are new to the game. I don't wish to impugn your abilities but are you sure you are in fact un-doing the cap, remember if it under the engine it appears, from the top, to go he other way.
Ned
PS sorry for overlap of six point sockets.

Brass_Machine:
Most Honda shops should have a replacement without having to order you one.

You may end up either having to spend some money or dropping the engine the engine to get that bolt out. Personally, I would get some sockets that are designed to remove rounded bolts. They come in handy... I have 2 sets, each a different style. The first is designed to grip the bolt on the flats.

IE:

Grip-Tite Sockets

The other set I have, is a reverse screw socket. Not sure of the brand, I will check them and see. The principle is, as the socket spins on the head of the bolt, the socket tightens its grip on the bolt.

Eric

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