sounds to me like your engine ran away on the oil in the intercooler and pipe work from when the turbo leaked its oil. The oil should have been cleaned out of the cooler and pipes before starting the engine. The engine will have over rev'ed as it was running on oil not diesel from the pump so max speed could not be controled by the pump/ecu. Id be supprised if its only damaged the injector and clamp as pistons and valves can collide under extreme high revs also con rods and bearings will have been under exteme strain!!!!
