Diesel noise from these engines is not always the CAM Phaser. Lash adjuster combine with a loose timing chain tensioner (and/or broken guide/Rail) will make you think you need to change the CAM Phaser. But really you need to replace the timing chain tensioner (blown gasket) or timing chain guide and/or rail along with the timing chain. Which when bad ... causes timing chain slap noise. You can tell if the timing chain guide/rail is broken by taking off your oil pan and looking up behind the crankshaft ignition pulse wheel. Most times you will see of piece of it laying right by the crankshaft.
One more thing about using 5w-20 oil .... this thin oil does not cool as well as thicker oils. Once you have taken one of these motors apart you too will be able to testify how the engine ran too hot by the signs from the pistons and out-of-round cylinders.
I know ... because I have read many a threads by many of people with the same old advice "Change the CAM Phaser" ...
I am in the processor right now of rebuilding this engine and I am here to tell you ... it is not always the CAM Phasers.
Just my two cents!
By the way ... these are not cheap engines to rebuild if you choose to do the job better than a Ford Crate Motor reman!
Just as an example ... at least one of my main crankshaft holes had .001" taper in it stock from the factory. Not good when you have only .0009" oil clearance over a width of less than an inch on these mains. You really need to start with a round straight hole to put the main bearings into. Or right off the assembly line you have a main bearing starving for oil on half its bearing.