Please can anyone identify the screw in the photo below.
I am just rebuilding the 4.2 series 2 XJ6 engine in my car.
It was found amongst the parts for the cam chain - but clearly it’s not from there.
It’s a 3/8 UNF and looks like a grub screw but could be a plug (from the crankcase?)
All a bit worrying.
Thanks in advance for your help.