{"model":"mk4","model_name":"MK4 Supra","vehicle":"Toyota Supra A80 (1993–2002, 2JZ-GE / 2JZ-GTE)","document":"Repair Manual","section":"EM","section_name":"Engine Mechanical","page":54,"pages_in_section":139,"title":"Engine Mechanical","section_header":"Engine — Engine Mechanical","ocr_text":"EG–54\nENGINE – ENGINE MECHANICAL\n\nP02190 P02188                                    Z02414\n\n(d)  Using SST and a hammer, tap in a new guide bushing to the\n     specified protrusion height.\n     SST 09201–10000 (09201–01060), 09608–30022\n          (09608–05010)\n     Protrusion height:\n          Intake\n               12.3–12.7 mm (0.484–0.500 in.)\n          Exhaust\n               11.4–11.8 mm (0.449–0.465 in.)\n\nHINT: Different bushings are used for the intake and exhaust.\n\nIntake                    Exhaust\n\n38.5 mm                  40.5 mm\n(1.516 in.)              (1.594 in.)\n\nP04791\n\nSharp\n6 mm\nReamer\n\nP02181 P02071                                    Z02415\n\n(e)  Using a sharp 6 mm reamer, ream the guide bushing to obtain\n     the standard specified clearance (See step 6) between the\n     guide bushing and valve stem.\n\nEM0254 EM0180                                    Z00054\n\n7.   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.\n     Valve face angle:\n          44.5°\n\n44.5°\n\n(c)  Check the valve head margin thickness.\n     Standard margin thickness:\n          0.8–1.2 mm (0.031–0.047 in.)\n     Minimum margin thickness:\n          0.5 mm (0.020 in.)\n     If the margin thickness is less than minimum, replace the\n     valve.\n\nMargin 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