Honda Civic 94 (mechanical) crankshaft pulley ...

If it were my case, I would not change the engine, unless it is in very bad conditions in general and that repairing it was more expensive than changing it.

You should keep in mind that changing a new piece that enters another already worn can create inconveniences by adjustment. It should be evaluated that more should be replaced.

Finally, it is possible that you should make a general repair to ensure that everything works properly and if that is the case, a newly repaired engine (eye, well repaired and with good quality parts) is better than a used engine that does not know how it comes or where.

... And thank you very much for your comment ..

But I have a great doubt, there is some difference between the engines versions America and Japanese ...

if you have information I would like you to send it to me: or you will tell me about it ... I will think about this question in the forum ...

I apologize my ignorance on the subject ..

Thank you very much anticipated ...

Hello friends, I comment that apparently that is a common failure in some Honda engines since the same happened to me and my mechanic told me that they had already taken some cars with that problem.
The best thing is if the pocket allows it to repair the engine since if it is done efficiently, an engine will have for many years, since the certainty will be held that its vital parts are new; The opposite of a used engine as you may take 1 day, 1 week 0 1 year who knows how much time.
In the end if you are going to invest money that is in something that ensures a good function for a long time.
In my case I made the effort and repair the engine at the end I spend approximately 30% more than I had cost me a used engine, but with the difference of the warranty of new parts.

Waiting for your comments.

Cordial greetings from the beautiful land of Quetzal ... Guatemala Centro America

Greetings and thank you very much ...

I will tell you that I seem an engine in a very good condition and I am already giving it firewood (using it, and I got more or less 20 % less than the repair with the ingredient that I already have the treated engine, and with this I can recover some so much % more ...

Thank you...

Note:
The Honda suffer this problem and it is because of the torque that should be given to the crankshaft pulley ...

I send you an image that I put ...