This quest was marked obsolete by Blizzard and cannot be obtained or completed.
If you wish to learn more about Goblin Engineering, take the Manual of Engineering Disciplines to Nixx Sprocketspring in Gadgetzan.
Expert engineering yields two distinct disciplines: gnome and goblin. I only bother to mention goblin engineering because I'm a fair trainer. They like to make things that blow up, and they rarely care what is in the way - even themselves.
<name>, read this manual. If you want to learn how to blow yourself up, then take it to Nixx Sprocketspring in Gadgetzan. Remember - membership is permanent and prevents joining the other discipline, so make sure this is what you want before finishing his task.
I can smell fresh recruits much like I can an excellent blasting powder - from a mile away. Have you come seeking to learn about the mastery of the explosion?
Well <name>, you were wise to seek my tutelage! Any schlep can become an expert at the basics of engineering - the gnomes and their irradiated home of Gnomeregan are proof of that. It takes a strong mind and a steady hand (emphasis on STEADY) though to master the discipline of Goblin Engineering.
Keep your ears perked <name>, and you might learn something.