Got a 2008 Subaru Legacy,  I just noticed a large chunk of my timing cover has fallen out.  I was looking for a replacement piece, but they all come in 3 parts and for some reaso, my cover is 2 parts with a larger left side. 

I still have the chunk that fell out would i be able to make a temporary repair for now?

yeah, any reasonable repair that doesn't increase risk to other parts should be fine. Some folks run with naked belts but I probably wouldn't on any daily driver. If I had just a fun whip, I might not care.

maybe JB weld a piece of a CD/DVD/Blueray disc over the hole?

 

two part plastic epoxy the piece back into place. 

ah, missed that the piece is still around.