I know it's not quite along the calibre of a scooby engine layout but I found this very cool screensaver. It shows an engine being built, nut by bolt to a pretty good soundtrack. 
 
  
 
It's about 41mb and I have scanned it for the latest viruses and spyware so should be ok to try on your computers. 
 
http://www.motorvids.co.uk/DeutzEngine.exe 
 
Run the file and click Install. Once it has completed, go into your screensaver configuration and it should be there.