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Welcome, I'm Chris and independent contractor that helps customers here.
Is the tapping noise coming from the valve covers or the front cover on the engine?
Do you know anything about the oil change history on the truck?
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Thanks, ***** ***** is known for so many valve train noises, from many different parts like the:
Most concerns come back to at some point the wrong oil was used and the service intervals were to long.
I suggest the first attempt prior to taking the engine apart is. Get the engine to operating temp. Add one gallon of kerosene to the engine oil. Run the engine at 2000 rpms for one minute. Shut it off then an hour later restart and run it at 2000 rpms for 30 seconds. Then drain the oil and filter overnight. Refill with Motorcraft 5-20 synthetic blend and one bottle of Mercon 5 transmission oil. If the concerns are from oil ports restricted in the head effecting all the prior mentioned valve train parts then this should clean it out and help with the noise and or resolve it.
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