{"model":"mk3","model_name":"MK3 Supra","vehicle":"Toyota Supra A70 (1986.5–1992, 7M-GE / 7M-GTE)","document":"Repair Manual","section":"EM","section_name":"Engine Mechanical","page":45,"pages_in_section":98,"title":"Engine Mechanical","section_header":"Engine Mechanical — Cylinder Head","ocr_text":"ENGINE MECHANICAL — Cylinder Head                                    EM-45\n\n(f) Gradually heat the cylinder head to approx. 90°C (194°F).\n(g) Using SST and hammer, drive in a new valve guide bushing until the snap ring makes contact with the cylinder head.\nSST 09201-70010\n\n(h) Using a sharp 6 mm (0.24 in.) reamer, ream the valve guide bushing to obtain standard specified clearance (See page EM-43) between the valve guide bushing and new valve.\n\n11. INSPECT AND GRIND VALVES\n(a) Grind the valve only 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\n(c) Check the valve head margin thickness.\nStandard margin thickness: 1.3 mm (0.051 in.)\nMinimum margin thickness: 0.5 mm (0.020 in.)\nIf the valve head margin thickness is less than minimum, replace the valve.\n\n(d) Check the valve overall length.\nStandard overall length: 98.15 mm (3.8642 in.)\nMinimum overall length: 97.75 mm (3.8484 in.)\nIf the valve overall length is less than minimum, replace the 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