As far as photographs, Google image search it. If you don't have that as one of your search engines like I do, do a regular Google search, then click the link near the top that says "images".
As far as a diagram, go to Autozone.com, register, click "Repair Info", enter your truck info (I'm hoping you know what year it is and what engine it has?), click "View Repair Guide",and they have them under "Routine Maintenance" for most vehicles.