not sure where you might find any official documentation.
The 4.2 is known to have a tick/click at lower rpm related to oil pump I believe it is. Nothing wrong or broken - just a characteristic.Most noticeable when (for example) sitting at the drive through window with a wall immediately to your left.

If you are unsure of the source of your noise, buy a mechanic' stethoscope and use it to find the area of origin.