Can i convert it to batterry if i can't find a motor and what size battery operated motor should i buy
You should be able to find a replacement AC motor (110V, 60 Hz for use in the US) at an electrical supply store, a clock shop, a hobby supply shop, or on-line. You could even go to a major retailer like Walmart and just get a regular (cheap) AC-operated mantle clock or something similar, and then use the guts of that to replace the defective one in your grandfather clock. Make sure the old grandfather clock hands fit on the new movement, or just replace the hands when you replace the movement. As far as using a DC (battery operated) movement goes, certainly you can do that. Again, go to a hobby supply store or a major retailer and buy a battery-operated clock. Remove the DC motorized movement and put it in your grandfather clock. The required battery size is specified by the movement itself. Typically a medium to large DC clock movement requires one AA or C battery, although some movements may require 2 each AA batteries or even a special battery, such as a Type N. Either way (replacing the AC motor with another similar type AC motor, or replacing the whole AC movement with a DC one), you should be fine.
go on craigs list. and maybe you should look in the yellow pages for a clock repaire