I think it is about time for a Valve adjustment.
It would help if you awnser the below
How many miles are on the car/engine?
Did it gradually make the nosie of one day start?
Any recent work done to the car?
What oil is in it(weigh ex:10w-30) and last oil change?
Where is the tapping comming from?
Thanks and good luck!
1991 Ford Taurs SHO 5 Speed White on Tan
1996 Chevy Lumina LTZ Rep 3.4L
1992 318i Coupe parts car
1992 325i Ls1 swap with a T56 6 speed 12.2 quarter mile
1976 Mercedes Benz 300D with a Ford 5.0L Fuel Injected soon to be Modded I am Captain Obvious