{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"EMS","section_name":"Engine Mechanical 1997 Supplement","page":9,"pages_in_section":126,"title":"Inspect Valve Stems and Guide Bushings","section_header":"Engine Mechanical (2JZ-GTE) - Cylinder Head","ocr_text":"EM-37\nENGINE MECHANICAL (2JZ-GTE) - CYLINDER HEAD\n\n9. INSPECT VALVE STEMS AND GUIDE BUSHINGS\n(a) Using a caliper gauge, measure the inside diameter of the guide bushing.\nBushing inside diameter:\n6.010 - 6.030 mm (0.2366 - 0.2374 in.)\n\nEM7717 P02073\nZ02413\n\n(b) Using a micrometer, measure the diameter of the valve stem.\nValve stem diameter:\nIntake 5.970 - 5.985 mm (0.2350 - 0.2356 in.)\nExhaust 5.965 - 5.980 mm (0.2348 - 0.2354 in.)\n(c) Subtract the valve stem diameter measurement from the guide bushing inside diameter measurement.\nStandard oil clearance:\nIntake 0.025 - 0.060 mm (0.0010 - 0.0024 in.)\nExhaust 0.030 - 0.065 mm (0.0012 - 0.0026 in.)\nMaximum oil clearance:\nIntake 0.08 mm (0.0031 in.)\nExhaust 0.10 mm (0.0039 in.)\nIf the clearance is greater than maximum, replace the valve and guide bushing.\n\nEM0963 EM0964\nZ00052\n\n10. INSPECT AND GRIND VALVES\n(a) Grind the valve enough to remove pits and carbon.\n(b) Check that the valve is ground to the correct valve face angle.\nValve face angle: 44.5°\n\n44.5°\nEM0254 EM0180\nZ00054\n\n(c) Check the valve head margin thickness.\nStandard margin thickness:\n0.8 - 1.2 mm (0.031 - 0.047 in.)\nMinimum margin thickness:\n0.5 mm (0.020 in.)\nIf the margin thickness is less than minimum, replace the valve.\n\nMargin Thickness\nEM0181\n\n1997 SUPRA (RM502U)\n\nAuthor : Date : 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