How hot to heat engine

[Zman]

While it may be challenging at times, you are learning considerable knowledge along the way. I commend you for taking on this project and continuing to work through the challenges. You will be amazed how much of what you are learning will apply to other things you encounter in life.

[Noobi06]

I bought 2 brand new Koyo 63/22 c4 crank bearings.
The ones in the case right now are exactly the same but have no play.
The brand new ones have play (I havent even installed them, they are out of the package)
Is that normal? I mean they are brand new but I feel like they have too much play

[Zman]

Can you describe where they feel loose?

[Noobi06]

Im pulling on the inner race. I can feel it go up and down a little. It feels more than usual though, especially since they are new

[Zman]

Just to clarify, are you saying a) the inner race has slop and can move radially toward the outer race or b) the inner race can move axially perpendicular to the outer race?

[Noobi06]

Ok, ignore what I said before.
Im actually gonna loose my mind.
Today I installed the bearing. It dropped right in (finally, first time). I had oven at 125C and bearing in freezer for 1.5days.
I was really happy and bearing spun without any noise or any bad stuff. This was when it was still hot because it absorbed the heat from the cases after installing.
After it cooled down, the bearing is now binding up (it gets stuck sometimes). What the fuck is going on, im gonna loose myself.
Is it some dirt that has gotten into the bearing? Or possibly because there is no oil?
Im going to wash it with petrol and oil it and see if that makes a difference

[Zman]

Was the engine clean when you assembled it? Are both of the crank cases together or is one side off? Is it possible the crank needs to be realigned?

[Noobi06]

Yes, engine cases was completely clean. I wash with petrol serveral times and also dish them like cutlery.
They were binding when cases was apart, meaning no crank. If I were to install the crank, it would spin completely free (had same problem before)
This time I was lucky and it actually stopped after 10 more minutes of waiting. I still dont know why it happens tho, but I was lucky this time.
At the time of writing, engine is almost done. Tomorrow will probably be startup
I have learnt so much at this point. I can assemble an engine with higher quality than a workshop now, in less that 6 hours. I can also replace bearings myself now. For me, the trick was bearings in freezer for 1-2 days and cases in over at 150 celcius for at least 30 minutes.

[Zman]

I am glad it is getting easier for you. Good luck tomorrow!