I have re-position the clutch from the engine and the clearance is now approximately 6 to 7 mm and have also re-adjusted the clearance between the thrust pad and the inner cone. The clutch is now disengaging beautifully. Thank you guys for your help. I feel happy that I got it to work with your help.
The clutch body has a slight wobble when I tried putting it in without any screws or the clutch key but it is quite tight when I put it in with the keys and screw.
One thing that's happening though when shifting from disengage to engage, there is like a very short scraping sound. Other than this, it is running fine.