Kestas, That is very interesting thank you. I did a cover off timing chain job on my 86 Euro 500SE that has a Euro 420 engine in it . I experienced that the chain would go slack for just a brief second and then re tighten as I rotated engine by hand as I checked out timing marks. As I was working with out a manual (very dumb trick) I thought this was caused buy the lack of oil pressure on a non running engine, I have driven the car several thousand miles since chain change but maybe I should go back and do something with the tensinor? would you or any one else know if this is nessary on a 420 engine..... Thank you...
William Rogers.......