EM-37 ENGINE MECHANICAL (2JZ-GTE) - CYLINDER HEAD 9. INSPECT VALVE STEMS AND GUIDE BUSHINGS (a) Using a caliper gauge, measure the inside diameter of the guide bushing. Bushing inside diameter: 6.010 - 6.030 mm (0.2366 - 0.2374 in.) EM7717 P02073 Z02413 (b) Using a micrometer, measure the diameter of the valve stem. Valve stem diameter: Intake 5.970 - 5.985 mm (0.2350 - 0.2356 in.) Exhaust 5.965 - 5.980 mm (0.2348 - 0.2354 in.) (c) Subtract the valve stem diameter measurement from the guide bushing inside diameter measurement. Standard oil clearance: Intake 0.025 - 0.060 mm (0.0010 - 0.0024 in.) Exhaust 0.030 - 0.065 mm (0.0012 - 0.0026 in.) Maximum oil clearance: Intake 0.08 mm (0.0031 in.) Exhaust 0.10 mm (0.0039 in.) If the clearance is greater than maximum, replace the valve and guide bushing. EM0963 EM0964 Z00052 10. INSPECT AND GRIND VALVES (a) Grind the valve enough to remove pits and carbon. (b) Check that the valve is ground to the correct valve face angle. Valve face angle: 44.5° 44.5° EM0254 EM0180 Z00054 (c) Check the valve head margin thickness. Standard margin thickness: 0.8 - 1.2 mm (0.031 - 0.047 in.) Minimum margin thickness: 0.5 mm (0.020 in.) If the margin thickness is less than minimum, replace the valve. Margin Thickness EM0181 1997 SUPRA (RM502U) Author : Date : 1142