2003 Hyundai Elantra Problen in the Engine

Engine Mechanical problem
2003 Hyundai Elantra 4 cyl Automatic 80000 miles

Hello Dear,
My name is Silviya. Recently I change my drive belts on Hyundai Elantra 2003. The day after, there was a noise when the engine starts, so I called the mechanic (I was concern because on next day we were going on long trip), and he said it is not a problem t be concern about and he will adjust the belts after we come back. Obviously the belts were not adjusted in the cog area. Is it possible If the belts were to tie to transform pressure to one of the metal part of the engine or the gasket, which part failed and came out, in turn allowing the crankshaft has to move and push out the crankshaft seal, causing a large oil leak coming from the crankshaft pulley area.

Sincerely

Silviya Sokolova