8. CYLINDER HEAD/VALVES MXU 550EXi /MXU500i Rocker Arms ROCKER ARMS REMOVAL/INSPECTION/ INSTALLATION REMOVAL Remove the camshafts (refer to the "CAMSHAFT REMOVAL/INSPECTION/ INSTALLATION" section in this chapter). Remove the rocker arm shafts and washers, then remove the rocker arms. Rocker Arm Shafts/Washers INSPECTION Rocker Arm Shaft Rocker arm shaft Inspect the rocker arm shaft for blue discoloration or grooves. If any defects are found, replace the rocker arm shaft with a new one, then inspect lubrication system. Measure each rocker arm shaft O.D. Measure the I.D. of each rocker arm. Measure arm to shaft clearance. Replace as a set if out of specification. Service limits: 0.1 mm Inspect the rocker arm bore, cam lobe contact Rock Arm surface and adjuster surface for wear/pitting/scratches/blue discoloration. If any defects are found, replace the rocker arm shaft with a new one, then inspect lubrication system. Measure each rocker arm shaft O.D. Measure the I.D. of each rocker arm. Measure arm to shaft clearance. Replace as a set if out of specification. Service limits: 0.1 mm 8-15