Thread: Semi floating hub bearings

To get mine apart I ground a slot in the collar and split it. This was because my collars had been welded to the axle.
To put it back together you need a press and some tooling.

Here it is going back together.





Colin

Thanks gromit

Where is the splined half shaft in that photo?

Russ

Basically you need a long piece of pipe of the right diameter, can't remember exactly what that was but you can measure the bearing and the shaft to make sure it fits and then put it in the press. Easy to damage the seals as well, but i can't remember which way it had to be done, bearing first then seal or seal first, maybe if the Ho Hars are online Harry might remember which way round it was when we did their 80". I didn't bother and just converted mine to full floating as I am not a fan of semi floating.

Cheers,

TimJ.

Originally Posted by rfurzer

Thanks gromit

Where is the splined half shaft in that photo?

Russ

Below the press.
This picture might help :-





Colin

I have a method for removing the rear bearings off the shaft without damage to the collars, so they can be reused.
If interested PM me and I will give you a phone number.
Dennis

To remove the collars, I made up the puller designed by Marco Tasselli ? who resides in West. Aust. having emigrated from the UK with his pre pro car.

When it comes to installing the collars, you want a interference fit as described in the manual , cant remember what it is ? 6 thou maybe .

Anyway , when assembling , if you warm up the collars before pressing them on, they will slide on relatively easily, heating them will expand them , as they cool and shrink they will tighten onto the axle . Shrink fitting is commonly used in machining .

Mike

The collars should have about a 0.003" interference fit; one of the ones I bought had no interference at all, so I had to make one.

To aid in pressing it all together I cast an aluminium press plate, which fits inside the brake backing-plate as I was concerned that pressing on the outside of the backing-plate might distort it,

Cheers Charlie

Originally Posted by chazza

The collars should have about a 0.003" interference fit; one of the ones I bought had no interference at all, so I had to make one.

To aid in pressing it all together I cast an aluminium press plate, which fits inside the brake backing-plate as I was concerned that pressing on the outside of the backing-plate might distort it,

Cheers Charlie

The previous owner of mine didn't worry about an interference fit !






The manual shows a tool that fits inside the backplate (like yours Charlie) for disassembly, reassembly is with a collar you poke the axle through like the one I used.

I spoke to Fred Smith about taking mine apart before I decided to buy a cheap press. He said that they can take 20tons to separate and he often ends up warming the collar with an oxy torch before it will release.
I cut & split mine as mentioned because I was replacing them anyway.


Colin