As said above vise grips or a pair of good sharp side cutters and then pry on the back side of the tool should make it come out. A good soaking with penetrating oil will likely help. A small tapered punch on the side of the key will allow small perfectly directed TAPS on the key as opposed to a hammer which may or may not hit it directly. Actual use has shown this to be true (don't ask how I know) and does not make any marks on the crank making it harder to remove the pulley )o;
It has been a while since I had one off but if I remember correctly the back of the slot the of the actual channel for the key is not square cut and will actually drive it tighter to the pulley. I wouldn't tap the key back towards the engine. There may be a "washer" back there that should stop it but I am not 100% sure and that's why I wouldn't.
Besides if it does go back much further you have just used up another option for getting it apart as you will no longer be able to get a hold of it.
From what I recall once you have the 4 clutch mounting bolts undone they will come free and then slide off without a lot of force sometimes leaving the key in the crank and sometimes with the clutch.
If the key does not come out easily I wouldn't force it much but if it does come out you may be able to turn the pulley a bit and cause it to become looser on the crank and make it easier to slide off.
These clutches engage "with a bang" and if there is enough room to easily slide things together when they are assembled there is some amount albeit a small amount of movement each time they are engaged and should not get so stuck they will not come off. By the looks of your picture they should not be rusted together.
It has been a while since I had one off but if I remember correctly the back of the slot the of the actual channel for the key is not square cut and will actually drive it tighter to the pulley. I wouldn't tap the key back towards the engine. There may be a "washer" back there that should stop it but I am not 100% sure and that's why I wouldn't.
Besides if it does go back much further you have just used up another option for getting it apart as you will no longer be able to get a hold of it.
From what I recall once you have the 4 clutch mounting bolts undone they will come free and then slide off without a lot of force sometimes leaving the key in the crank and sometimes with the clutch.
If the key does not come out easily I wouldn't force it much but if it does come out you may be able to turn the pulley a bit and cause it to become looser on the crank and make it easier to slide off.
These clutches engage "with a bang" and if there is enough room to easily slide things together when they are assembled there is some amount albeit a small amount of movement each time they are engaged and should not get so stuck they will not come off. By the looks of your picture they should not be rusted together.
