I'm something of a noob to blender. I appended a model of an engine to the 2nd layer of my project, and for some reason, no objects from this model show up when I render. If I add a cube to the 2nd layer, the cube shows up behind an outline of the engine, but not the engine itself. The object in layer 1 shows up fine. For the life of me I cannot find why the objects from this model don't show up. I have the render visibility turned on for all of them, and I can't find anything else that would change visibility (ie the layer is lit, etc.)
Can anyone point out to me what I'm missing? Its probably something obvious. Here is the file: https://www.dropbox.com/s/5q1lnq91oxtpkbg/Blend%20for%20SE.blend?dl=0