4 - 21ENGCAMSHAFT, ROCKER ARMS AND VALVESCHECKING THE VALVES AND VALVESPRINGS1.Measure: Stem-to-guide clearanceOut of specification → Replace the valveguide.Stem-to-guide clearance =valve guide inside diameter a –valve stem diameter bClearance (stem to guide):Intake:0.010 ~ 0.037 mm(0.0004 ~ 0.0015 in): 0.080 mm (0.0031 in)Exhaust:0.030 ~ 0.057 mm(0.0012 ~ 0.0022 in): 0.100 mm (0.0039 in)2.Replace: Valve guide*****************************************************Replacement steps:NOTE:To ease guide removal, installation and tomaintain correct fit, heat the cylinder head to100 °C (212 °F) in an oven. Remove the valve guide using a valve guideremover 1. Install the new valve guide using a valveguide remover 1 and valve guide installer 2. After installing the valve guide, bore thevalve guide using a valve guide reamer 3 toobtain proper stem-to-guide clearance.NOTE:After replacing the valve guide reface the valveseat.*****************************************************Valve guide remover (7.0 mm):P/N. YM-01225-A, 90890-01225Valve guide installer (7.0 mm):P/N. YM-04017, 90890-04017Valve guide reamer (7.0 mm):P/N. YM-01227, 90890-01227
