engine noise on 1995 BMW 318is

my car having very noisy sound inside the engine what is the primary cause to this problem

Asked by for the 1995 BMW 318is
1 answer
You need to see a BMW specialist. It could be a failing alternator or water pump, or a bad belt or worse, but have given me no good information in your question. A person would have to see the car and hear the noise to be sure.
Here's a directory link for you, but I don't know if it covers PR so you may have to find a guy on your own.