SOHC.co.uk Forums > CB750

Taper roller bearings

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martin_uk:
Hi Andy
Its unlikely that bearings will bed in unless the races are not fully seated.

The rubber seal should not be in between the lower bearing and lower yoke seating ie not stopping it fully seating.

I like to use an aluminium or brass drift as doesnt damage.

You should  hear the change in note when it is fully seated.

Maybe also have a look at the top adjuster to see what is stopping you threading on fully.

There are some things you can take a chance on but steering is not one I would recommend.

royhall:
I had this problem a few months ago. This thread may help. http://www.sohc.co.uk/index.php/topic,6987.0.html    Cheers

andut:
Thanks Roy ! 

I did read your thread earlier and ordered the same dust seal with steel inner, so it sounds as if I have the same set up of steel washer on the steering column, then the dust seal with steel inner and then the lower brg.

Do you recall if you had many threads showing above the top brg when you fitted the top adjusting nut ?  That's the worry I have - I can only get a few turns on the adjuster nut without over-tightening the steering.  Both outer races are seated in the frame, so I'm debating if a few turns of the top nut is OK, or if I need to start again and remove the lower brg from the steering column and refit without the steel washer at the base of the assembly - could be fun !

Andy

royhall:
If I remember correctly, the nut threaded all the way on. Looking at the pictures of your top bearing, mine was way further into the headstock. Don't think yours is driven home fully. I may be wrong about this (cant just remember) but I don't think I used the spacer washer at all. Cant really check on that now its all together, Trigger will know!! From what I can see in the pictures the bike is looking good.

andut:
Ok, I'm convinced it's not right and it has to be !!  Managed to use the bottom edge of the thick washer to gently tap the new brg most of the way off of the steering column without damage, but then the drift slipped a bit under the rag I was using and I now have a slignlty damaged brg cage - bugger !

New brg now ordered together with a thinner lower washer, so hopefully I should be able to get a closer match between the old ballrace and new (again!) tapered brg stack heights.

Andy

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