{"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":44,"pages_in_section":98,"title":"Engine Mechanical","section_header":"Engine Mechanical — Cylinder Head","ocr_text":"10. IF NECESSARY, REPLACE VALVE GUIDE BUSHINGS\n(a) Insert an old valve wrapped with tape into the valve guide bushing and break off the valve guide bushing by hitting it with a hammer.\nNOTICE: Be careful not to damage the lifter hole.\n\n(b) Gradually heat the cylinder head to approx. 90°C (194°F).\n\n(c) Using SST and hammer, drive out valve guide bushing. SST 09201-70010\n\n(d) Using a caliper gauge, measure the valve guide bore of the cylinder head.\n\n(e) Select a new valve guide bushing.\nIf the valve guide bushing bore of the cylinder head is more than 11.027 mm (0.4341 in.), machine the bore to the following dimensions.\nRebored valve guide bushing bore dimension:\n11.050 — 11.077 mm (0.4350 — 0.4361 in.)\n\nBoth intake and exhaust\nBushing bore mm (in.) | Bushing size\n11.000 — 11.027 (0.4331 — 0.4341) | Use STD\nOver 11.027 (0.4341) | Use O/S 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