Grant,
That motor housing has about had it. It won't take much more to finish breaking those cracks.
There is however an anaerobic adhesive that will glue it down very well. It's called LocTite Black Max. It's kind of like a thread locker / super glue combo and it is one great product. The only place I've been able to find it is Midway.
{
http://www.midwayusa.com/ }. Also it's really black so when you use it on the motor housing it doesn't show up.
Here's a tip. Use denatured alcohol to degrease the cracks before using the Black Max.
Joe