I recently did a d15b swap, and i just found out that something is eating away at my timing belt. Its cutting away at the top part to the inner side of the timing belt. I was going to change the water pump, tensioner, and timing belt but inspected the parts already on the motor and they looked like theyve been replaced recently.This morning it was a slight groove, and by tonight it was down to bare metal! It looks like if i keep on driving it, its going to snap real soon. What can be the causes of this? I can replace it, but what do i look for in case this keeps happening in the future. It has an after market crank pulley. Can this also be a factor?? PLEASE HELP!!! GOTTA DRIVE THE CAR TOMORROW

 

It may be that the washers at the bottom "wheel gearing" are missing or damaged. These are located behind the crank pulley.