I have a 4 speed 91 civic std, and the engine seems to be locked up, it's like it's trying to turn the motor but it wont turn. I have already tried to turn the motor with a wrench by the pulley, but it wont even turn. Also the starter and alternator seem to be ok, so i don't the problem is there. I think there might be something wrong inside the motor. Any suggestions??

 

I have the same car and engine.

What happened prior to this engine lockup? i.e. was it running ok, etc.

 

well there could be two issues with the amount of info we have received this is my diagnosis
you cant turn over the motor by hand

your weak or
your motor is trash buy a b,h,or k series and move on up

 

been around water lately?