Gday everyone, looking for answers, i have put a new cylinder head and new head gasket into a, Nissan Pathfinder R51 Diesel Engine, everything is complete, although when trying to start the engine, it cranks over nicely, but simply won't start, please note, i have attached a photo of a bolt left over but have no idea where it goes, i thought it might be from the EGR system, but all the bolts are present.