drop the oil, see what comes out, look for blown hoses, check the coolant levels, as well as the tranny level if you get it fired back up.

if it smoked under the hood and quit, you need to find out whats blown out on it.

the 3100 likes to blow lim gaskets, and head gaskets. if could have blown one of them, a compression test will show a bad head gasket, milky oil should be the lim.