Hey if im putting a gasket on my left side of my case, and it rips, can I still use it?

 

not to sure which gasket your talking about but if its just to keep dirt and dust out and theres no oil or water behind it
just use a small amount of silicon where it ripped and it will seal the tear
if theres oil or water I wouldnt use it because it might leak a little even if you use silicon on it
and you could damage the motor if it does leak and you dont catch it in time