Need help

Hi guys. I replaced the timing Chan. Went to hand turn it make shower it was ok. And it was not!. At T D C it catch is and 1/3 of the way back it stops. I thought I must have taken dropped a nut or sum thing down the intake. So I took off the heads and the oil pan when and not that ether. I can see hotel bottom and top. I have no way to get a round. Any help will be greatly appreciated