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.