Good tips...thanks!

I thought I had an unused tube of something. Just found 2 things I'd already bought. Got Quicksteel plastic putty which i've used before and is good stuff....but I'm not sure it'll work on the timing cover.

Also have an unused tube of Permatex Perma Poxy 2 part 5min plastic weld. Primary ingredients are Methyl Methacrylate and Methacrylic acid.
Says good for ABS Acrylic Fiberglass Glass PVC Styrene Steel Vinyl Wood. Looks like it'll work unless the cover is made of polyethylene or polypropylene.