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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