hey i just bought a cheap 95 ls integra. the owner drove it to my house so i know it kinda runs. the only noticable probloem with the engine is the main drive pulley. it has no belts on it and it rattles. when i took off the wheel, the bolt wasnt tightened on it. i tried to tighten it but couldnt. do i need a high powered air gun or am i hitting someting inside the engine?? please help