Help with GEARBOX BEARINGS

[gerumgoin]

Hi guys/girls,so stripping down engine and removed crank bearings etc on my Mk1 125LC,got to the GEARBOX BEARINGS,sorry if noob question but how the bloody hell do these 2 bearings come out,is there a special tool to remove them so no damage,obviously there's no back to push them out.?

[mellow]

you could try heating thecases a little in the oven even though haynes advises against this

[neil]

heat the cases in the oven til they hiss when you spray water on them, keep a close eye as dosent take long, have a flat piece of wood or a solid bench and with gloves on bang the crank case half squarely(making sure dowls are removed) on wood which should jar them out. if they are stubbon especially the little needle roller ones, try making a little a little slide hammer.

[gerumgoin]

Cheers guys i will give it a shot.

[billy]

Nov 9, 2011 0:05:21 GMT 1 neil said:

heat the cases in the oven til they hiss when you spray water on them, keep a close eye as dosent take long, have a flat piece of wood or a solid bench and with gloves on bang the crank case half squarely(making sure dowls are removed) on wood which should jar them out. if they are stubbon especially the little needle roller ones, try making a little a little slide hammer.

Sorry mate but that's not gonna work as the bearing races also becomes hot and expands in the bearing seats. There's only one correct way to get them out and that is to use a pulley that will grab the inside of the bearing.







There's also a tool that you slam the bearings out with. Very common to use for whel bearings.
I don't know what the bloody hell you call this tool (I used to know this lol) but I know you use an expander socket thingy that fits inside the bearing, then there's a long rod and a thing on the rod which you hold and then slam upwards. Not the best explanation lol, but I can't describe it better.

Edit: They look like this. You slam the shiny thing upwards and it'll pull the bearing out. i259.photobucket.com/albums/hh302/turbostang331/frontbearing/P1010017.jpg

Btw I never removed the bearings when I cleaned my dads 125 cases, they were in good nick so I just let them sit in there. You can wash the cases with the bearings still in there, you just gotta be fast blowing the water out of the bearings with compressed air. Obviously when cleaning cases, you do the last flushing with hot water so the water quickly evaporates, but hot water will make steel rust faster, so you have to blow the water out of the bearings fast.

[mellow]

you could try one of those large metal rawl bolt thingys,where u do the bolt up and it spreads the other end open.....then whack that down on a bench

[Tone]

I bought a cheapy heat gun from Argos to do the sprocket carrier bearing on my LC2. Heated up area around bearing and tapped it out from the opposite side by tapping the centre race of the old bearing (only do this if you're replacing the bearing). You can put the new bearing in a bag and put it in the freezer for a while and heat up area where bearing fits and the bearing should just drop in. Don't hit the centre race of the new bearing as it will ruin it.

[neil]

i managed to do mine ok with heat.