Compressor rotor-crank dismantllng

[gmphadte]

I want to replace the bearing of a tornado power block 25 direct drive compressor. The bearing sits between the rotor and the crank. I gave it to a shop for dismantling but this seems to be impossible task as all possible methods are attempted.

Does anybody know how is it fitted, or is it some type of welding.

Help please...

Gajanan Phadte

[gmphadte]

The compressor is Torpedo power block 25

[ak_47_boy]

The bearing is pressed onto the crankshaft?

[tryonziess]

You might find that a special tool is needed to remove the bearing race from the shaft. Many high quality compressor manufacturers have a shaft to race tolerance which requires quite a bit of pressure to remove. This practice insures longer life from the components.
If pressing the bearing off has not worked I would try cutting the bearing in half and removing it. If you are careful with a torch or cutoff wheel you should not have any problem.
Can you find the replacement bearing? Tad

If the bearing has failed you might do some more detailed inspection. Other components might also be wornout.

[gmphadte]

Removing bearing is not the problem but separating the motor rotor from the crank. The bearing sits loose in between these two and the crankcase.

edit:
What I suspect is that the crankshaft is friction welded (not sure) to the rotor, since the crankshaft is not supported on the other end.
On second thought, I doubt anybody will go to this extend but u never know.

Gajanan Phadte

[TheMG]

The rotor could also be pressed onto the shaft. I've even seen some induction motors where the rotor was actually cast around the shaft, hopefully this isn't your case, because if it is then it is quite literally impossible to remove.

A pressed-on rotor is removable but may require a special tool and quite a bit of force to remove.

[tryonziess]

Are you sure the crankshaft knuckle itself is not pressed on. Some early motorcycle crankshafts were made this way. Check real close and see if the shaft from the rotor is not pressed into this offset piece. You never know. Tad

[gmphadte]

The rotor could also be pressed onto the shaft. I've even seen some induction motors where the rotor was actually cast around the shaft, hopefully this isn't your case, because if it is then it is quite literally impossible to remove.

I am going to inspect the materials.

It is something ...either pressed or threaded. Considering these, the rotor was hammered by using a chisel as a wedge. Nothing happened.
Thinking of the second possibility, it was fitted to a big lathe chuck, the crank heated using a gas welding torch and hammered in the loosening direction considering its rotation. It won't budge.
By the way this product is made in Germany(former FRG), if it is of any use.

Gajanan Phadte

[gmphadte]

Giving a second thought, the possibility of rotor being cast on the rod is not possible as the the lengthy rod will not pass through the fixing hole of the crankcase.
The motor rod is about 8-10 inches and the crankcase is about 5 inches. Also there is no straight path for the rod.

Gajanan Phadte

[tryonziess]

PICTURE!!!!!!