Sound near timing belt and burning smell

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Mazda Protege 1994 DX
Hi

I have a 1994 Mazda Protege DX with 130000 miles on it. It had some battery issues before so I replaced the battery. Now I am getting knocking or more like clunking sounds near the timing belt. I can also smell something burning also. Can anyone help with where to start with diagnosis? I would like to start repairing it myself, so help.

I have a video but could not download as it was too big.

I am trying to make it lighter and then upload.


Thanks in advance
Sam
 
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