maybe I can help you out this time!!!
I change the tappets and they would not shut up after starting to the extent that I redid the whole job using a mixture of old and new tappets until it was quiet on start up,a frustrating and time consuming experience!!A few weeks later whilst in the MB dealer for something I explained what had occurred and was told it is a common problem and it can take up to a 100 miles to bleed the air out!!!
YOU LIVE AND LEARN