UKKid35

The outer bearing was a trivial job to install

The outer race of the inner bearing has proved to be a nightmare

Hub was left in the oven at 220C for 30 minutes, bearing shells were left in the freezer overnight

They did not drop in, and the race stopped moving 3mm from the seat, perfectly level

I used a club hammer and drift set with assembly lube added



A very generous 928 buddy helped me try to seat the race but it didn't move any further when using a 12 ton press, and more heat

The bearings are SKF, not generic rubbish, the previous bearings races were the originals (as there were no witness marks in the hub)

What has gone wrong, and what are my options?

Timothy Smyth

Got to be slightly off centre those fitting kits are so/so i remove a thou or so of the old outer race and use it to refit new race .

UKenGB

As I said elsewhere Paul, either the hub is malformed (unlikely) or initial installation has caused it to pick up and that is now jamming it all up. Have to remove that outer race and check the hub inner surface. Clean up any ridges that have been created and carefully push it in again, paying particular attention to starting it perfectly aligned so no other obstacles formed.

Careful use of a press probably better than a club hammer, although gentle taps might be required to get it started in perfect alignment.

Mrmerlin

More than likely you have a burr on the hub seating surface ,
Use some 600 grit paper to check the walls verify the seat is also burr free
clan the surfaces then heat the hub spray with PB blaster before you drop in the race.
Note the outer race can also fall out while your working
280 f to 300 f is more than plenty for the races to fall in or out

If thats not happening then maybe you damaged the hub with the press
Note some presses can add a sideways force to a installation this can bend the part

Worst comes to worst replace the hub