Remove the cylinder head cover and remove the spark plugs.
If necessary, turn the crankshaft by the camshaft pulley flange.
Adjust the clearance between the eccentric and the end of the valve stem by first loosening the rocker arm nut.
After adjustment, tighten the rocker arm nut using a special flange nut wrench 11 1 150 and a torque wrench.
Clearances in the valve drive mechanism
The normal clearance between the rocker arm eccentric and the end of the valve stem, measured with a feeler gauge on a cold engine, is 0.25 mm for intake and exhaust valves.
[This article is based on data from the website: «BMWMan»]