mxu 550 exi Werkstatthandbuch : Seite 176

          8. CYLINDER HEAD/VALVES                                           MXU 550EXi /MXU500i


 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                   Service Limit
                               IN                    0.1 mm                           
 Valve clearance (cold)
                               EX                    0.1 mm                           
 Cylinder head compression pressure                 15 kg/cm2                         
 Cylinder head warpage                                                              0.05
 Camshaft runout                                                                    0.05
                               IN                    37.2614                        37.11
 Camshaft cam height
                               EX                    37.0084                        36.86
                               IN                 10 10.015                          10.1
 Valve rocker arm I.D.
                               EX                 10 10.015                          10.1
 Valve rocker arm shaft        IN                9.975 9.99                           9.9
 O.D.                          EX                  9.9759.99                          9.9
 Rocker arm to shaft clearance                   0.009 0.042                          0.1
                               IN                4.975 4.99                         4.925
 Valve stem O.D.
                               EX                 4.955 4.97                        4.915
                               IN                   5 5.015                          5.03
 Valve guide I.D.
                               EX                   5 5.015                          5.03
 Valve stem-to-guide           IN                0.01 0.037                          0.08
 clearance                     EX                0.03 0.057                           0.1




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