6. CYLINDER HEAD/VALVES Downtown 300i ABS SERVICE INFORMATION GENERAL INSTRUCTIONS · The cylinder head can be serviced with the engine installed in the frame. Coolant in the radiator and water hoses must be drained. · When assembling, apply molybdenum disulfide grease or engine oil to the valve guide movable parts and valve arm sliding surfaces for initial lubrication. · The valve rocker arms are lubricated by engine oil through the engine oil passages. Clean and unclog the oil passages before assembling the cylinder head. · After disassembly, clean the removed parts and dry them with compressed air before inspection. · After removal, mark and arrange the removed parts in order. When assembling, install them in the reverse order of removal. SPECIFICATIONS Standard (mm) Item Valve clearance (cold) IN 0.10 EX 0.10 Cylinder head compression pressure 16 kg/cm Camshaft cam height IN 34.2987 EX 34.1721 Valve rocker arm I.D. IN 10.0010.015 EX 10.0010.015 Valve rocker arm shaft IN 9.9729.987 O.D. EX 9.9729.987 Valve seat width IN 1.2 EX 1.2 Valve stem O.D. IN 4.9904.975 EX 4.9704.955 Valve guide I.D. IN 5.005.012 EX 5.005.012 Valve stem-to-guide IN 0.0100.037 clearance EX 0.0300.057 TORQUE VALUES SPECIAL TOOL Valve spring compressor E063 6-2