Vintage BMW Motorcycle Owners

Hello Guys,
It was late yesterday and i thought i would just knock off a job quickly and install my new silent block for the seat bearing. See attached images.
Anyway you should never rush a job
After making up a puller i was able to remove the old block, but the problem came when trying to install the new one, in short i ended up getting it seized 2/3 the way through and i could not move it for love nor money.

So i left it grumbling and thinking about over night i am going to pull it out and try again.

Anyway my new process is to make up a puller that will remove the old one and install the new one.

But it got me thinking about the type of fit and i assumed that it is a press fit which is hard to do on a bike frame. So i did some calculation and think that i need to heat up the bush to about 180 degrees celcius and then install the new silent block. At this temperature a bush of diameter of 25 mm will expand about 0.0508 which is 2 thou. 2 thou is usually the interference fit for a press fit.

Would appreciate comments if i have missed anything, or there is an easier way.

If this was my project before going the heating route I would lightly sand the outside of the bushing to make it a little smaller and then use some red Loctite to make sure it doesn't work loose.
Jim

I had a problem like this for my R 69 S and I think it was not made perfectly.

I chucked it up on the lathe and took a few thousands off and was able to drive it in just fine.

If you have access to a lathe that would be the more elegant way to do it for sure. If you don't, for a part like this seat bushing, I wouldn't worry about using the emery cloth method to get it good enough to press into the hole.

thanks guys great idea..

i will put it on lathe and take a few thou off.