My brother said he used it to repair either the engine case or the clutch bell in a truck.  I can't tell you if it's still good or not.

Do the smart thing on this one, have it welded by a professional.
Years back the bottom of my engine case was damaged on the highway; knocked a pretty hole in about the size of a 50 cent piece edge wise, just like on a piggy bank.  It did require a complete engine disassembly for the repair to be made but it was worth it.  The weld was beautifully done and I never had to worry about it again.
Do it right the first time.

Awwrite, then get the engine out & upside down ( Yea, Id drain it first.,.)
& hit the crack with some Berrymans brake cleaner, let it dry, blow it out & use a triangle file & cut a groove, flush again, then when ya put the JB weld to it, mix it a little cool, use less than 50% of the white stuff, it will cure slower & wont be so brittle. IF it starts leaking again, before ya just slap more goo on it, have a good look & see if the crack has walked out from under the end of the JB weld. Cracks grow with heat & cool cycles & vibration. The only stop for that is either weld it up or drill a hole at the end of the crack, giving it a radius to vibrate into. I learned that in 5th grade, when a window on an airplane was cracked & thats how my stepdad went about stopping it from growing,

OR,, You could just clean it up real good & slap some JB weld on it & See how well that works. YOu mite be happier doing that a few times than pulling the motor once,, youve already proven theyre heavy.