what is this thing?!?!?! it is there and always scares me

[IMG]https://i1021.photobucke*****m/albums/af334/depp0/Engine2009-10-2616-31-50-56.jpg[/IMG]
[IMG]https://i1021.photobucke*****m/albums/af334/depp0/Engine2009-10-2616-31-28-53.jpg[/IMG]
[IMG]https://i1021.photobucke*****m/albums/af334/depp0/Engine2009-10-2616-31-58-54.jpg[/IMG]