Gents,

This is the first time I have looked at the inside of a front cover.  Are
these "cracks" normal?  Or did my part get stressed somewhere along the line
and now I need a new cover?

Chris
 

 

Those are called foldovers and oclutions, and are typical of permanent mold aluminum injection molding. The mold temperature may have been a bit low for this shot, and subsequent shots would have had fewer such imperfections. Ultrasound inspection would reveal any actual discontinuities.

 

Lynn E. Hanover