11 34 800 Installing valve stem seal Checking valve for wear F110190 2 • Check valve stem diameter and valve head seat width. Wear dimensions for valve: Stem diameter Inlet valve...........................min. 4.89 mm (0.192 in) Exhaust valve .....................min. 4.89 mm (0.192 in) • Check valve for runout. L Note: Remove oil carbon from valve and deburr grooves for valve collets with an oilstone. For wear limits, see Technical Data. E110120 • Install bottom valve spring retainer (1). • Use a drift, BMW No. 11 6 650 , to insert valve stem seal (2). • Check grooves for valve collets. 11.32 1