Bearings

[pmcq]

Hello All,

I am trying to fit a bearing into an engine case (R6) and having problems. It fits into a recess in the crank case. It supports one end of the output shaft. The bearing needs to be pressed in but seems it needs a lot of force. I put the bearing into the freezer overnight and tried it and no joy. Then I tried heating up the case itself. I am thinking I didnt heat it enough though, but its very hot to touch. I am reluctant to try using a g-clamp (or hammer even!) or something to pull the bearing in in case it buckles. Maybe a combination of cold bearing and heated case? I've found a few bits on the web talking about using dry ice etc but they are not easy to get.

Any suggestions?
Cheers!

[cupasoop]

Take the case and the bearing down to your local bike shop or engineering firm and bung someone a couple of quid to put it in a proper press and do it for you. Saves a lot of fannying about.

[alan]

I have just done alot of work on my bike and had to remove several bearings with a socket so i can polish and powder coat, i found the same problem putting them back in didnt want to hammer and ruin my finishes so

How i did mine was a socket which sits on the outer race of the bearing clamped my swingarm with a wooden packer and bearing with socket and slowly tightened the vice on the socket thus pressing the bearing into its recess might not be so easy for you being a crank case, other than my way i would go with cupasoop and have it hydraulic pressed in.

Alan

[yellafella]

If you've tried both those options ( and they are extreme !) i would suggest the bearing is the wrong size ! They should never be thet kind of interference fit ! Do you have access to a vernier caliper or micrometers ?
You may have te right size bearing but is it a recommended bearing ? There is a slght difference between manufacturers, and dont let anyone tell you different !

[pmcq]

Its actually the bearing that was in it originally. I managed to get it out by pushing it out from behind. Handy when there is a hole in the crankcase case caused by a sprocket nut coming off doing a ton!

I am just concious of the forces required. Its more fear of damaging the bearing itself than anything but I guess they are made from hard steel. A hydraulic press it going exert huge forces on it also.

Thanks for the help lads. I'll let ye know how I get on.

[pmcq]

Right well the bearing is in. I once again heated it up with a gas burner and put some engine oil on the outer race and used a wooden drift to tap it in. Needed a metal bar (soft metal) to tap the final bit but it sitting fine now.
Cheers lads.

[Jaglifter]

pmcq,

I wouldn't touch it with a burner!! Wait till the other half is out and put it in the oven.

[Stormin Ben]

Wait till the other half is out and put it in the oven.

Like that
And while you're using the cooker, you can get a pot of lifelink and boil the chain in it -always popular with 'er indoors