Recently i have repair my Mitsubishi pajero engine and used it for almost not more than 8days. Unfortunately the crankshaft broke on the way i was driving 100km far from my home. Now i bought new crankshaft, and the gasket should be uninstall to check whether the connecting rod has a problems or not. Can i reuse the head gasket or buy a new one? Thank you.
It's not a wise choice to reused the head gasket. First of all they aren't all that expensive especially compared to the other costs you will incur fixing a broken crankshaft. Secondly, while you MAY get away with it, chances are the old one will leak and you'll find yourself having to replace it anyway.
BTW, a broken crank is an uncommon issue. Usually they are caused by another problem such as a seized piston or failed/spun bearing.