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Check the High pressure fuel pump tappet by removing the high pressure fuel pump and pulling out the tappet/cam follower these have a tendency to wear out prematurely also where that tappet rides on the cam it wear out the cam lobe as well. the 2.0T has been there worst engine to date (in my humble opinion) unfortunately.
The cam followers are self adjusting,so an engine flushing agent and new oil (10/40 semi synthetic), should sort out the "tapping" noise,When the engine is hot run at 3500 revs for 30 secs to reset gaps
When setting tappets, it has to be born inind that the valve stem wears an indentation into the face of the rocker. This prevents a really accurate tappet adjustment, so the customer is right again. If you do not posess a tappet setting dial gauge, a normal engineers dial gauge will do just as well. The procedure is the same as using your feeler gauge except that you set the dial gauge up on the cylinder head with the pointer resting on the head of the rocker. Press down fairly firmly on the rocker valve end and zero the gauge. Next lift up on the rocker and read off the clearance, from the gauge, Use a magnetic base to support your gauge and repeat the pocedure for each valve pair.
Did you check the pressure first? Noisy tappets don't necessarily mean low pressure, sometimes they simply wear out.
Otherwise, either your oil pump is bad, or the oil pickup screen located inside the oil pan area is clogged up. Clean the screen first and then check the pressure...
Hi Sounds like your thermostat needs replacing to cure the cold running.
As for the ticking sound, check your engine oil first, if its OK. its usually the hydraulic tappets, and a can of STP or Wyns oil addative in with the engine oil, can sometimes quieten them down !
Good Luck !