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6. CYLINDER HEAD/VALVES DOWNTOWN 125i
SERVICE INFORMATION
GENERAL INSTRUCTIONS
· The cylinder head can be serviced with the engine installed in the frame. Coolant in the radiator
and water jacket must be drained first.
· 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 cylinder head 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 Unit: mm
Item Standard
Valve clearance (cold) IN 0.1
EX 0.1
Cylinder head compression pressure 15kg/cm
Cylinder head warpage
IN 25.965
Camshaft cam height EX 25.810
IN 10.0~10.015
Valve rocker arm I.D. EX 10.0~10.015
Valve rocker arm shaft IN 9.972~9.987
O.D. EX 9.972~9.987
IN 4.975~4.970
Valve stem O.D. EX 4.975~4.970
IN 5.0~5.012
Valve guide I.D. EX 5.0~5.012
Valve stem-to-guide IN 0.010~0.037
clearance EX 0.030~0.057
TORQUE VALUES
Cylinder head cover bolt 0.8~0.9 kgf-m
Tensioner mounting bolt 0.9 kgf-m
Tensioner sealing bolt 0.9 kgf-m
Cylinder head cap nut 2 kgf-m
Apply engine oil to threads
Cylinder head bolt 0.7~1.1 kgf-m
6-2