engine bay

Hi All, I recently purchased an '08 Ford explorer (former government vehicle) it's got 80K miles and I don't have specifics on its maintenance besides it oil changes. I have two questions, what are some parts and areas or maintenance you recomend I check out and see if its been replaced or...

I apologise if this has been posted already..but I have searched and cannot find anything..im basically looking for a stock motor diagram, labeling everything in the bay, if anyone can help I'd be much appreciated...please and thank you.

when turning left the front right of my vehicle makes a griding noise. can't quite diagnose the problem. maybe someone else had this problem? please let me know. its annoying to the point that i.. well i would just like to get it fixed. thanks in advance