7. CYLINDER HEAD/VALVES MXU 300/250 Rocker Arms Stop Plate CAMSHAFT HOLDER DISASSEMBLY Take out the valve rocker arm shafts. Remove the valve rocker arms, arm shafts and stop plate. Rocker Arm Shafts CAMSHAFT HOLDER INSPECTION Camshaft Holder Inspect the camshaft holder for wear or damage. 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. Rocker Arm Shafts Rocker Arm Bore Inspect the rocker arm bore, cam lobe contact 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. Contact Surface Adjuster Surface 7-6